{"id":4861,"date":"2026-02-20T12:06:49","date_gmt":"2026-02-20T10:06:49","guid":{"rendered":"https:\/\/scispx.com\/?page_id=4861"},"modified":"2026-10-19T14:20:34","modified_gmt":"2026-10-19T12:20:34","slug":"kjeldahl-vs-dumas","status":"publish","type":"page","link":"https:\/\/scispx.com\/fr\/kjeldahl-vs-dumas\/","title":{"rendered":"Kjeldahl contre Dumas : diff\u00e9rences, m\u00e9thodes et applications"},"content":{"rendered":"<div data-elementor-type=\"wp-page\" data-elementor-id=\"4861\" class=\"elementor elementor-4861\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-1bfaca91 e-flex e-con-boxed e-con e-parent\" data-id=\"1bfaca91\" data-element_type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;,&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-32ece343 e-con-full e-flex e-con e-child\" data-id=\"32ece343\" data-element_type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t<div class=\"elementor-element elementor-element-2d861f3b e-con-full e-flex e-con e-child\" data-id=\"2d861f3b\" data-element_type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-1b61e9f1 elementor-widget elementor-widget-heading\" data-id=\"1b61e9f1\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">Kjeldahl vs. Dumas<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-62a8f12e elementor-widget elementor-widget-text-editor\" data-id=\"62a8f12e\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Quelle m\u00e9thode de d\u00e9termination de l\u2019azote convient le mieux \u00e0 votre laboratoire ?<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-12d53b40 e-con-full e-flex e-con e-child\" data-id=\"12d53b40\" data-element_type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-58b463c9 elementor-widget elementor-widget-button\" data-id=\"58b463c9\" data-element_type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/scispx.com\/fr\/contact\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Contactez nos Xperts<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-1744b454 e-con-full e-flex e-con e-child\" data-id=\"1744b454\" data-element_type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-1d3aac93 elementor-widget elementor-widget-image\" data-id=\"1d3aac93\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"500\" src=\"https:\/\/scispx.com\/wp-content\/uploads\/2026\/01\/Infographic-Kjeldahl-vs-Dumas-Sample-throughput-EN-1024x640.webp\" class=\"attachment-large size-large wp-image-4865\" alt=\"\" srcset=\"https:\/\/scispx.com\/wp-content\/uploads\/2026\/01\/Infographic-Kjeldahl-vs-Dumas-Sample-throughput-EN-1024x640.webp 1024w, https:\/\/scispx.com\/wp-content\/uploads\/2026\/01\/Infographic-Kjeldahl-vs-Dumas-Sample-throughput-EN-300x188.webp 300w, https:\/\/scispx.com\/wp-content\/uploads\/2026\/01\/Infographic-Kjeldahl-vs-Dumas-Sample-throughput-EN-768x480.webp 768w, https:\/\/scispx.com\/wp-content\/uploads\/2026\/01\/Infographic-Kjeldahl-vs-Dumas-Sample-throughput-EN-1536x960.webp 1536w, https:\/\/scispx.com\/wp-content\/uploads\/2026\/01\/Infographic-Kjeldahl-vs-Dumas-Sample-throughput-EN-18x12.webp 18w, https:\/\/scispx.com\/wp-content\/uploads\/2026\/01\/Infographic-Kjeldahl-vs-Dumas-Sample-throughput-EN.webp 1600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-7e201aa9 e-flex e-con-boxed e-con e-parent\" data-id=\"7e201aa9\" data-element_type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;,&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-771422b7 e-con-full e-flex e-con e-child\" data-id=\"771422b7\" data-element_type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t<div class=\"elementor-element elementor-element-4d2208cd e-con-full e-flex e-con e-child\" data-id=\"4d2208cd\" data-element_type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-325c8a elementor-widget elementor-widget-heading\" data-id=\"325c8a\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Quelle m\u00e9thode de d\u00e9termination de l\u2019azote convient le mieux \u00e0 votre laboratoire ? <\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-13d21e8e elementor-widget elementor-widget-button\" data-id=\"13d21e8e\" data-element_type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/scispx.com\/fr\/food-campaign\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">En savoir plus sur les applications alimentaires<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-40c0d3f1 e-con-full e-flex e-con e-child\" data-id=\"40c0d3f1\" data-element_type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-60f93036 elementor-widget elementor-widget-text-editor\" data-id=\"60f93036\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p data-pm-slice=\"1 1 []\">La d\u00e9termination de l\u2019azote est essentielle dans les analyses alimentaires et des aliments pour animaux, l\u2019agriculture, les laboratoires environnementaux et l\u2019industrie chimique. Mais quelle m\u00e9thode choisir : Kjeldahl ou Dumas ?\n\nLes deux m\u00e9thodes fournissent des mesures fiables de l\u2019azote, mais elles diff\u00e8rent par leur principe analytique, leur vitesse, leur niveau d\u2019automatisation, leur s\u00e9curit\u00e9 et les formes d\u2019azote qu\u2019elles mesurent.<\/p><p>\u00a0<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-c10c218 e-flex e-con-boxed e-con e-parent\" data-id=\"c10c218\" data-element_type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-5a6a4f8 e-con-full e-flex e-con e-child\" data-id=\"5a6a4f8\" data-element_type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;,&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7e0126c elementor-widget elementor-widget-button\" data-id=\"7e0126c\" data-element_type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"#kjeldahl2\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Kjeldahl<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5e4fb8c elementor-widget elementor-widget-button\" data-id=\"5e4fb8c\" data-element_type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"#dumas2\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Dumas<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c19fb57 elementor-widget elementor-widget-button\" data-id=\"c19fb57\" data-element_type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"#comparisonkjeldahldumas\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Kjeldahl vs. Dumas<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-107b3c0 elementor-widget elementor-widget-button\" data-id=\"107b3c0\" data-element_type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"#accuracykjeldahldumas\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Exactitude<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0628755 elementor-widget elementor-widget-button\" data-id=\"0628755\" data-element_type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"#howtochoosekjeldahldumas\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Comment choisir<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-783efa8 elementor-widget elementor-widget-button\" data-id=\"783efa8\" data-element_type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"#readmorekjeldahldumas\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Plus d'info<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-1008d1b8 e-con-full e-flex e-con e-parent\" data-id=\"1008d1b8\" data-element_type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t<div class=\"elementor-element elementor-element-1e382069 e-flex e-con-boxed e-con e-child\" data-id=\"1e382069\" data-element_type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;,&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-f67d6b1 e-con-full e-flex e-con e-child\" data-id=\"f67d6b1\" data-element_type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t<div class=\"elementor-element elementor-element-7f2f5d1c e-con-full e-flex e-con e-child\" data-id=\"7f2f5d1c\" data-element_type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t<div class=\"elementor-element elementor-element-40a873b3 e-con-full e-flex e-con e-child\" data-id=\"40a873b3\" data-element_type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-36d800aa elementor-widget elementor-widget-heading\" data-id=\"36d800aa\" data-element_type=\"widget\" id=\"kjeldahl2\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Qu'est-ce que la m\u00e9thode Kjeldahl ? <\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9ccb97d elementor-widget elementor-widget-text-editor\" data-id=\"9ccb97d\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p data-pm-slice=\"1 1 []\">Introduite en 1883, la m\u00e9thode Kjeldahl reste une technique de r\u00e9f\u00e9rence largement utilis\u00e9e pour la d\u00e9termination de l\u2019azote et des prot\u00e9ines. Elle mesure l\u2019azote organique et l\u2019azote ammoniacal dans des \u00e9chantillons tels que les aliments, les aliments pour animaux et les produits agricoles.<\/p><p>Cette m\u00e9thode est reconnue dans de nombreuses proc\u00e9dures analytiques normalis\u00e9es, notamment les m\u00e9thodes AOAC et ISO.<\/p><h3><strong>Comment fonctionne la m\u00e9thode Kjeldahl ?<\/strong><\/h3><p><strong>La m\u00e9thode Kjeldahl comporte trois \u00e9tapes principales :<\/strong><\/p><ol start=\"1\" data-spread=\"false\"><li><p><strong>Min\u00e9ralisation :<\/strong>\u00a0l\u2019\u00e9chantillon est chauff\u00e9 avec de l\u2019acide sulfurique concentr\u00e9, g\u00e9n\u00e9ralement \u00e0 environ 400 \u00b0C. Cette \u00e9tape convertit l\u2019azote organique en sulfate d\u2019ammonium.<\/p><\/li><li><p><strong>Distillation :<\/strong>\u00a0de l\u2019hydroxyde de sodium est ajout\u00e9 pour lib\u00e9rer l\u2019ammoniac, qui est s\u00e9par\u00e9 par distillation puis collect\u00e9 dans une solution r\u00e9ceptrice.<\/p><\/li><li><p><strong>Titrage :<\/strong> l\u2019ammoniac collect\u00e9 est quantifi\u00e9 par titrage afin de calculer la teneur en azote.<\/p><\/li><\/ol><p>La teneur en azote d\u00e9termin\u00e9e peut ensuite \u00eatre convertie en teneur en prot\u00e9ines brutes \u00e0 l\u2019aide d\u2019un facteur de conversion appropri\u00e9.<\/p><h3 data-pm-slice=\"1 1 []\"><strong>Quels sont les avantages de la m\u00e9thode de Kjeldahl ?<\/strong><\/h3><p>La principale force de la m\u00e9thode Kjeldahl r\u00e9side dans sa validation historique, en particulier pour la d\u00e9termination des prot\u00e9ines dans les aliments et les aliments pour animaux.<\/p><p><strong>Parmi ses avantages, on peut citer :<\/strong><\/p><ul data-spread=\"false\"><li><p><strong>M\u00e9thode de r\u00e9f\u00e9rence \u00e9tablie :<\/strong>\u00a0largement reconnu dans les proc\u00e9dures analytiques normalis\u00e9es.<\/p><\/li><li><p><strong>Des r\u00e9sultats fiables :<\/strong>\u00a0a<span style=\"background-color: transparent;\">dapt\u00e9e \u00e0 la d\u00e9termination de routine des prot\u00e9ines dans de nombreuses matrices alimentaires et fourrag\u00e8res.<\/span><\/p><\/li><li><p><strong>Infrastructure existante :<\/strong>\u00a0les laboratoires \u00e9quip\u00e9s pour la m\u00e9thode Kjeldahl peuvent continuer \u00e0 utiliser des proc\u00e9dures d\u00e9j\u00e0 valid\u00e9es.<\/p><\/li><li><p><strong>Facteurs de conversion \u00e9tablis :<\/strong>\u00a0de nombreuses m\u00e9thodes de d\u00e9termination des prot\u00e9ines utilisent des facteurs de conversion historiquement associ\u00e9s \u00e0 l\u2019analyse Kjeldahl.<\/p><\/li><\/ul><h3><strong>Quelles sont les limites de la m\u00e9thode de Kjeldahl ?<\/strong><\/h3><p>Malgr\u00e9 son utilisation r\u00e9pandue, la m\u00e9thode Kjeldahl pr\u00e9sente plusieurs limites :<\/p><ul data-spread=\"false\"><li><p><strong>Dur\u00e9e d'analyse plus longue :<\/strong> la digestion, la distillation et le titrage peuvent n\u00e9cessiter plusieurs heures.<\/p><\/li><li><p><strong>Produits chimiques dangereux :<\/strong>\u00a0la m\u00e9thode requiert de l\u2019acide sulfurique concentr\u00e9, de l\u2019hydroxyde de sodium et souvent des catalyseurs.<\/p><\/li><li><p><strong>D\u00e9chets chimiques :<\/strong> les r\u00e9actifs et r\u00e9sidus de digestion n\u00e9cessitent une manipulation et une \u00e9limination adapt\u00e9es.<\/p><\/li><li><p><strong>Couverture limit\u00e9e de l\u2019azote :<\/strong> la m\u00e9thode Kjeldahl conventionnelle ne d\u00e9termine pas compl\u00e8tement l\u2019azote sous forme de nitrates et de nitrites sans traitement suppl\u00e9mentaire.<\/p><\/li><li><p><strong>Manipulations manuelles :<\/strong> m\u00eame si l\u2019automatisation est possible, le proc\u00e9d\u00e9 comporte plusieurs \u00e9tapes de pr\u00e9paration et d\u2019analyse.<\/p><\/li><\/ul><p>Ces limitations peuvent rendre la m\u00e9thode Kjeldahl moins pratique pour les laboratoires traitant de grands volumes d\u2019\u00e9chantillons.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-24c11f18 e-con-full e-flex e-con e-child\" data-id=\"24c11f18\" data-element_type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t<div class=\"elementor-element elementor-element-2715e1e3 e-con-full e-flex e-con e-child\" data-id=\"2715e1e3\" data-element_type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t<div class=\"elementor-element elementor-element-772c98e e-con-full e-flex e-con e-child\" data-id=\"772c98e\" data-element_type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-bfc0e20 elementor-widget elementor-widget-heading\" data-id=\"bfc0e20\" data-element_type=\"widget\" id=\"dumas2\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Qu'est-ce que la m\u00e9thode Dumas ? <\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-71569cdb elementor-widget elementor-widget-text-editor\" data-id=\"71569cdb\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>La m\u00e9thode Dumas, \u00e9galement appel\u00e9e <strong>M\u00e9thode de combustion Dumas<\/strong>, d\u00e9termine la teneur en azote par combustion \u00e0 haute temp\u00e9rature. Contrairement \u00e0 la m\u00e9thode Kjeldahl, elle ne n\u00e9cessite pas de digestion chimique humide. L\u2019\u00e9chantillon est soumis \u00e0 une combustion dans un environnement riche en oxyg\u00e8ne.<\/p><p>L\u2019analyse Dumas est largement utilis\u00e9e pour la d\u00e9termination de l\u2019azote et des prot\u00e9ines brutes dans les aliments, les aliments pour animaux, les produits agricoles et d\u2019autres mat\u00e9riaux.<\/p><h3><strong>Comment fonctionne la m\u00e9thode Dumas ?<\/strong><\/h3><p>La m\u00e9thode de Dumas comprend g\u00e9n\u00e9ralement quatre \u00e9tapes :<\/p><ol start=\"1\" data-spread=\"false\"><li><p><strong>Combustion :<\/strong> l\u2019\u00e9chantillon est br\u00fbl\u00e9 \u00e0 haute temp\u00e9rature, g\u00e9n\u00e9ralement entre 900 et 1 000 \u00b0C, dans un environnement riche en oxyg\u00e8ne.<\/p><\/li><li><p><strong>Conversion du gaz :<\/strong> les compos\u00e9s contenant de l\u2019azote sont transform\u00e9s en oxydes d\u2019azote et autres produits de combustion.<\/p><\/li><li><p><strong>R\u00e9duction et purification :<\/strong> les oxydes d\u2019azote sont r\u00e9duits en azote mol\u00e9culaire (N\u2082) et les autres produits de combustion sont \u00e9limin\u00e9s.<\/p><\/li><li><p><strong>D\u00e9tection :<\/strong> un d\u00e9tecteur \u00e0 conductivit\u00e9 thermique mesure l\u2019azote gazeux afin de d\u00e9terminer la teneur en azote de l\u2019\u00e9chantillon.<\/p><\/li><\/ol><p>La teneur en azote mesur\u00e9e peut ensuite \u00eatre utilis\u00e9e pour calculer la teneur en prot\u00e9ines brutes. Gr\u00e2ce \u00e0 son haut niveau d\u2019automatisation, un analyseur Dumas moderne peut traiter les \u00e9chantillons avec une intervention minimale de l\u2019op\u00e9rateur.<\/p><h3 data-pm-slice=\"1 1 []\"><strong>Quels sont les avantages de la m\u00e9thode Dumas ?<\/strong><\/h3><p>La m\u00e9thode Dumas pr\u00e9sente plusieurs avantages pour les laboratoires recherchant une d\u00e9termination plus rapide et plus automatis\u00e9e de l\u2019azote.<\/p><ul data-spread=\"false\"><li><p><strong>Analyse rapide :<\/strong>\u00a0de nombreux analyseurs Dumas modernes r\u00e9alisent une mesure en environ 3 \u00e0 5 minutes.<\/p><\/li><li><p><strong>Absence de produits chimiques dangereux :<\/strong> aucune utilisation d\u2019acides ou d\u2019alcalis concentr\u00e9s dans la proc\u00e9dure analytique.<\/p><\/li><li><p><strong>Automatisation \u00e9lev\u00e9e :<\/strong> la gestion automatis\u00e9e des \u00e9chantillons est adapt\u00e9e aux laboratoires \u00e0 fort d\u00e9bit.<\/p><\/li><li><p><strong>D\u00e9termination \u00e9tendue de l\u2019azote :<\/strong> la m\u00e9thode mesure l\u2019azote total, y compris de nombreux compos\u00e9s azot\u00e9s inorganiques.<\/p><\/li><li><p><strong>R\u00e9duction des d\u00e9chets chimiques :<\/strong>\u00a0l\u2019analyse par combustion \u00e9vite les d\u00e9chets liquides acides associ\u00e9s \u00e0 la digestion Kjeldahl.<\/p><\/li><\/ul><p>Ces avantages rendent la m\u00e9thode Dumas particuli\u00e8rement attractive pour les laboratoires privil\u00e9giant la productivit\u00e9, la s\u00e9curit\u00e9 et l\u2019efficacit\u00e9 du traitement des \u00e9chantillons.<\/p><h3><strong>Quelles sont les limites de la m\u00e9thode Dumas ?<\/strong><\/h3><p>Malgr\u00e9 ses nombreux avantages, l\u2019analyse Dumas pr\u00e9sente \u00e9galement certaines limites :<\/p><ul data-spread=\"false\"><li><p><strong>Un investissement initial plus \u00e9lev\u00e9 :<\/strong> les analyseurs de combustion automatis\u00e9s n\u00e9cessitent g\u00e9n\u00e9ralement un investissement plus important.<\/p><\/li><li><p><strong>Consommation de gaz :<\/strong> la m\u00e9thode requiert de l\u2019oxyg\u00e8ne et des gaz vecteurs adapt\u00e9s.<\/p><\/li><li><p><strong>Maintenance de routine :<\/strong> les composants de combustion, consommables et syst\u00e8mes de purification des gaz n\u00e9cessitent un entretien r\u00e9gulier.<\/p><\/li><li><p><strong>Consid\u00e9rations li\u00e9es aux \u00e9chantillons :<\/strong> la masse pr\u00e9lev\u00e9e et l\u2019homog\u00e9n\u00e9it\u00e9 de l\u2019\u00e9chantillon peuvent influencer la repr\u00e9sentativit\u00e9 des r\u00e9sultats.<\/p><\/li><\/ul><p>Les laboratoires doivent \u00e9valuer ces facteurs en fonction de leurs exigences analytiques et du d\u00e9bit d\u2019\u00e9chantillons attendu.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-57b7826f e-con-full e-flex e-con e-parent\" data-id=\"57b7826f\" data-element_type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t<div class=\"elementor-element elementor-element-5a464aa1 e-flex e-con-boxed e-con e-child\" data-id=\"5a464aa1\" data-element_type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;,&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-b8e0762 e-con-full e-flex e-con e-child\" data-id=\"b8e0762\" data-element_type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-c3e70e5 elementor-widget elementor-widget-heading\" data-id=\"c3e70e5\" data-element_type=\"widget\" id=\"comparisonkjeldahldumas\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Comparaison des m\u00e9thodes Dumas et Kjeldahl <\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7cc07425 articletext elementor-widget elementor-widget-text-editor\" data-id=\"7cc07425\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<table><tbody><tr><td><p><strong>Caract\u00e9ristique<\/strong><\/p><\/td><td><p><strong>M\u00e9thode Kjeldahl<\/strong><\/p><\/td><td><p><strong>Dumas<\/strong> <strong>M\u00e9thode<\/strong><\/p><\/td><\/tr><tr><td><p><strong>Principe<\/strong><\/p><\/td><td><p>Chimie humide (digestion, distillation et titrage)<\/p><\/td><td><p>Combustion \u00e0 haute temp\u00e9rature<\/p><\/td><\/tr><tr><td><p><strong>Azote mesur\u00e9<\/strong><\/p><\/td><td><p>Azote organique uniquement<\/p><\/td><td><p>Azote total (organique + inorganique)<\/p><\/td><\/tr><tr><td><p><strong>Temps d'analyse typique<\/strong><\/p><\/td><td><p>2-4 heures<\/p><\/td><td><p>3-5 minutes<\/p><\/td><\/tr><tr><td><p><strong>Produits chimiques requis<\/strong><\/p><\/td><td><p>Acide sulfurique, hydroxyde de sodium, catalyseurs<\/p><\/td><td><p>Aucun r\u00e9actif chimique humide (gaz uniquement)<\/p><\/td><\/tr><tr><td><p><strong>Automatisation<\/strong><\/p><\/td><td><p>Limit\u00e9e<\/p><\/td><td><p>Enti\u00e8rement automatis\u00e9e<\/p><\/td><\/tr><tr><td><p><strong>S\u00e9curit\u00e9 et environnement<\/strong><\/p><\/td><td><p>D\u00e9chets chimiques, r\u00e9actifs corrosifs<\/p><\/td><td><p>Faible production de d\u00e9chets et proc\u00e9d\u00e9 plus s\u00fbr<\/p><\/td><\/tr><tr><td><p><strong>Co\u00fbt de l'instrument<\/strong><\/p><\/td><td><p>Plus faible<\/p><\/td><td><p>Plus \u00e9lev\u00e9<\/p><\/td><\/tr><tr><td><p><strong>Co\u00fbt d'exploitation<\/strong><\/p><\/td><td><p>Mod\u00e9r\u00e9 (r\u00e9actifs, \u00e9limination des d\u00e9chets)<\/p><\/td><td><p>Faible (principalement les gaz)<\/p><\/td><\/tr><tr><td><p><strong>Applications les mieux adapt\u00e9es<\/strong><\/p><\/td><td><p>Analyse r\u00e9glement\u00e9e des prot\u00e9ines dans les aliments et les aliments pour animaux<\/p><\/td><td><p>Laboratoires \u00e0 haut d\u00e9bit et d\u00e9termination de l\u2019azote total<\/p><\/td><\/tr><\/tbody><\/table>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-75d4bc2 e-flex e-con-boxed e-con e-parent\" data-id=\"75d4bc2\" data-element_type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-1e497ad elementor-widget elementor-widget-heading\" data-id=\"1e497ad\" data-element_type=\"widget\" id=\"accuracykjeldahldumas\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Kjeldahl ou Dumas : quelle m\u00e9thode est la plus pr\u00e9cise ?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e2d060a elementor-widget elementor-widget-text-editor\" data-id=\"e2d060a\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p data-pm-slice=\"1 1 []\">Les m\u00e9thodes Kjeldahl et Dumas peuvent toutes deux fournir des mesures de l\u2019azote pr\u00e9cises et reproductibles lorsqu\u2019elles sont mises en \u0153uvre selon des proc\u00e9dures valid\u00e9es. Cependant, leurs r\u00e9sultats ne sont pas toujours identiques.<\/p><p><strong>La m\u00e9thode Dumas peut produire des valeurs d\u2019azote l\u00e9g\u00e8rement plus \u00e9lev\u00e9es, car elle mesure une gamme plus large de compos\u00e9s azot\u00e9s.<\/strong> La m\u00e9thode Kjeldahl conventionnelle ne r\u00e9cup\u00e8re pas compl\u00e8tement certaines formes d\u2019azote inorganique, notamment les nitrates et les nitrites. L\u2019\u00e9cart observ\u00e9 d\u00e9pend de la composition de l\u2019\u00e9chantillon et de la quantit\u00e9 d\u2019azote non prot\u00e9ique pr\u00e9sente.<\/p><p>Aucune des deux m\u00e9thodes ne mesure directement les mol\u00e9cules de prot\u00e9ines. Elles d\u00e9terminent toutes deux la teneur en azote, qui est ensuite utilis\u00e9e pour estimer la teneur en prot\u00e9ines brutes. Le choix de la m\u00e9thode doit donc \u00eatre bas\u00e9 sur la norme analytique applicable, la matrice de l\u2019\u00e9chantillon et les exigences de rapportage, plut\u00f4t que sur la seule vitesse d\u2019analyse.<\/p><h3><strong>Comment calcule-t-on la teneur en prot\u00e9ines \u00e0 partir de la d\u00e9termination de l\u2019azote ?<\/strong><\/h3><p>La d\u00e9termination de l\u2019azote joue un r\u00f4le essentiel dans l\u2019analyse des prot\u00e9ines dans les secteurs de l\u2019alimentation humaine et animale.<\/p><p>Les m\u00e9thodes Kjeldahl et Dumas mesurent l\u2019azote plut\u00f4t que les prot\u00e9ines elles-m\u00eames. Les laboratoires calculent ensuite la teneur en prot\u00e9ines brutes en multipliant le pourcentage d\u2019azote mesur\u00e9 par un facteur de conversion.<\/p><p><strong>Prot\u00e9ines brutes (%) = Azote (%) \u00d7 Facteur de conversion<\/strong><\/p><p>Le facteur de conversion le plus couramment utilis\u00e9 est 6,25, bas\u00e9 sur l\u2019hypoth\u00e8se que les prot\u00e9ines contiennent environ 16 % d\u2019azote.<\/p><p>Par exemple, un \u00e9chantillon contenant 2 % d\u2019azote aura une teneur estim\u00e9e en prot\u00e9ines brutes de :<\/p><p><strong>2% \u00d7 6,25 = 12,5% de prot\u00e9ines brutes<\/strong><\/p><p>Toutefois, le facteur de conversion appropri\u00e9 d\u00e9pend du type d\u2019\u00e9chantillon et de la norme analytique appliqu\u00e9e. Certains produits n\u00e9cessitent des facteurs diff\u00e9rents en raison de la composition azot\u00e9e sp\u00e9cifique de leurs prot\u00e9ines.<\/p><p>Aucune des deux m\u00e9thodes ne distingue totalement l\u2019azote prot\u00e9ique de l\u2019ensemble des formes d\u2019azote non prot\u00e9ique. Par cons\u00e9quent, la valeur calcul\u00e9e de prot\u00e9ines brutes ne repr\u00e9sente pas n\u00e9cessairement la quantit\u00e9 exacte de prot\u00e9ines r\u00e9elles.<\/p><p>Cette distinction est particuli\u00e8rement importante lors de l\u2019analyse de produits alimentaires complexes, de prot\u00e9ines v\u00e9g\u00e9tales et d\u2019autres mat\u00e9riaux contenant des compos\u00e9s azot\u00e9s non prot\u00e9iques.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-4a57c2b6 e-con-full e-flex e-con e-parent\" data-id=\"4a57c2b6\" data-element_type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t<div class=\"elementor-element elementor-element-726223c5 e-flex e-con-boxed e-con e-child\" data-id=\"726223c5\" data-element_type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;,&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-7d4249c9 e-con-full e-flex e-con e-child\" data-id=\"7d4249c9\" data-element_type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t<div class=\"elementor-element elementor-element-562273c6 e-con-full e-flex e-con e-child\" data-id=\"562273c6\" data-element_type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t<div class=\"elementor-element elementor-element-2942d5dc e-con-full e-flex e-con e-child\" data-id=\"2942d5dc\" data-element_type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-105619e4 elementor-widget elementor-widget-heading\" data-id=\"105619e4\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Quand Kjeldahl est-il le meilleur choix pour la d\u00e9termination de l'azote ?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f186081 elementor-widget elementor-widget-text-editor\" data-id=\"f186081\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p data-pm-slice=\"1 1 []\">La m\u00e9thode Kjeldahl reste un choix pertinent pour les laboratoires qui travaillent selon des m\u00e9thodes \u00e9tablies de d\u00e9termination de l\u2019azote et des prot\u00e9ines.<\/p><p><b>Cela s'av\u00e8re particuli\u00e8rement utile lorsque :<\/b><\/p><ul data-spread=\"false\"><li><p><strong>La conformit\u00e9 r\u00e9glementaire impose la m\u00e9thode Kjeldahl :<\/strong> certaines normes analytiques sp\u00e9cifient explicitement l\u2019utilisation de cette m\u00e9thode.<\/p><\/li><li><p><strong>Les \u00e9chantillons contiennent principalement de l'azote organique :<\/strong> c\u2019est le cas de nombreuses applications dans les produits laitiers, la viande, les c\u00e9r\u00e9ales, les boissons et les aliments pour animaux.<\/p><\/li><li><p><strong>Le laboratoire dispose d\u00e9j\u00e0 d\u2019un \u00e9quipement Kjeldahl :<\/strong> les flux de travail valid\u00e9s et les proc\u00e9dures existantes peuvent \u00eatre conserv\u00e9s.<\/p><\/li><li><p><strong>Le d\u00e9bit d'\u00e9chantillons est relativement faible :<\/strong> des temps d\u2019analyse plus longs peuvent \u00eatre acceptables pour des volumes d\u2019\u00e9chantillons limit\u00e9s.<\/p><\/li><\/ul><p>La m\u00e9thode Kjeldahl reste particuli\u00e8rement pr\u00e9cieuse pour l\u2019analyse traditionnelle des prot\u00e9ines et les applications n\u00e9cessitant une validation sp\u00e9cifique \u00e0 cette m\u00e9thode.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-7ab0a8b7 e-con-full e-flex e-con e-child\" data-id=\"7ab0a8b7\" data-element_type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-660ef38 elementor-widget elementor-widget-image\" data-id=\"660ef38\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"800\" height=\"420\" src=\"https:\/\/scispx.com\/wp-content\/uploads\/2026\/02\/LinkedIn-SciSPX-39-1024x538.png\" class=\"attachment-large size-large wp-image-4896\" alt=\"\" srcset=\"https:\/\/scispx.com\/wp-content\/uploads\/2026\/02\/LinkedIn-SciSPX-39-1024x538.png 1024w, https:\/\/scispx.com\/wp-content\/uploads\/2026\/02\/LinkedIn-SciSPX-39-300x158.png 300w, https:\/\/scispx.com\/wp-content\/uploads\/2026\/02\/LinkedIn-SciSPX-39-768x403.png 768w, https:\/\/scispx.com\/wp-content\/uploads\/2026\/02\/LinkedIn-SciSPX-39-18x9.png 18w, https:\/\/scispx.com\/wp-content\/uploads\/2026\/02\/LinkedIn-SciSPX-39.png 1200w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-13115184 e-con-full e-flex e-con e-child\" data-id=\"13115184\" data-element_type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t<div class=\"elementor-element elementor-element-17106d68 e-con-full e-flex e-con e-child\" data-id=\"17106d68\" data-element_type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4c96b95 elementor-widget elementor-widget-image\" data-id=\"4c96b95\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"800\" height=\"420\" src=\"https:\/\/scispx.com\/wp-content\/uploads\/2026\/02\/LinkedIn-SciSPX-40-1024x538.png\" class=\"attachment-large size-large wp-image-4897\" alt=\"\" srcset=\"https:\/\/scispx.com\/wp-content\/uploads\/2026\/02\/LinkedIn-SciSPX-40-1024x538.png 1024w, https:\/\/scispx.com\/wp-content\/uploads\/2026\/02\/LinkedIn-SciSPX-40-300x158.png 300w, https:\/\/scispx.com\/wp-content\/uploads\/2026\/02\/LinkedIn-SciSPX-40-768x403.png 768w, https:\/\/scispx.com\/wp-content\/uploads\/2026\/02\/LinkedIn-SciSPX-40-18x9.png 18w, https:\/\/scispx.com\/wp-content\/uploads\/2026\/02\/LinkedIn-SciSPX-40.png 1200w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-4e492e35 e-con-full e-flex e-con e-child\" data-id=\"4e492e35\" data-element_type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t<div class=\"elementor-element elementor-element-7facd2e0 e-con-full e-flex e-con e-child\" data-id=\"7facd2e0\" data-element_type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-5d661282 elementor-widget elementor-widget-heading\" data-id=\"5d661282\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Quand Dumas est-il le meilleur choix pour la d\u00e9termination de l'azote ?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2d3ba250 elementor-widget elementor-widget-text-editor\" data-id=\"2d3ba250\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p data-pm-slice=\"1 1 []\">La m\u00e9thode Dumas convient particuli\u00e8rement aux laboratoires qui recherchent une analyse rapide et automatis\u00e9e de l\u2019azote.<\/p><p><strong>Il est id\u00e9al pour :<\/strong><\/p><ul data-spread=\"false\"><li><p><strong>Laboratoires \u00e0 haut d\u00e9bit :<\/strong>\u00a0la rapidit\u00e9 de l\u2019analyse facilite le traitement de grands volumes d\u2019\u00e9chantillons.<\/p><\/li><li><p><strong>Le contr\u00f4le qualit\u00e9 dans les secteurs alimentaire et de l\u2019alimentation animale :<\/strong>\u00a0la d\u00e9termination automatis\u00e9e de l\u2019azote favorise des analyses coh\u00e9rentes et reproductibles.<\/p><\/li><li><p><strong>Les laboratoires privil\u00e9giant la s\u00e9curit\u00e9 :<\/strong> la m\u00e9thode \u00e9vite l\u2019utilisation d\u2019acides concentr\u00e9s et les \u00e9tapes de digestion chimique.<\/p><\/li><li><p><strong>Analyses environnementales et agricoles :<\/strong> la d\u00e9termination de l\u2019azote total est particuli\u00e8rement utile pour certaines matrices telles que les sols, les engrais et d\u2019autres \u00e9chantillons agricoles.<\/p><\/li><li><p><strong>Les laboratoires souhaitant r\u00e9duire les d\u00e9chets chimiques :<\/strong> l\u2019analyse par combustion \u00e9limine les d\u00e9chets acides associ\u00e9s \u00e0 la digestion Kjeldahl.<\/p><\/li><\/ul><p>Sa rapidit\u00e9 et son niveau d\u2019automatisation peuvent justifier un investissement initial plus important, en particulier dans les laboratoires qui analysent un grand nombre d\u2019\u00e9chantillons chaque jour.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-b1bbe7c e-flex e-con-boxed e-con e-parent\" data-id=\"b1bbe7c\" data-element_type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-48b1bb3 elementor-widget elementor-widget-heading\" data-id=\"48b1bb3\" data-element_type=\"widget\" id=\"howtochoosekjeldahldumas\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Que faut-il prendre en compte pour choisir entre Kjeldahl et Dumas ?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-b1de3e2 e-con-full e-flex e-con e-parent\" data-id=\"b1de3e2\" data-element_type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t<div class=\"elementor-element elementor-element-977c3a3 e-flex e-con-boxed e-con e-child\" data-id=\"977c3a3\" data-element_type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;,&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-29ab657 e-con-full e-flex e-con e-child\" data-id=\"29ab657\" data-element_type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e098898 articletext elementor-widget elementor-widget-text-editor\" data-id=\"e098898\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p data-pm-slice=\"1 1 []\">Avant de s\u00e9lectionner une m\u00e9thode de d\u00e9termination de l\u2019azote, plusieurs facteurs pratiques doivent \u00eatre \u00e9valu\u00e9s.<\/p><p><strong>1. Exigences analytiques<\/strong><\/p><p>V\u00e9rifiez si la norme applicable impose la m\u00e9thode Kjeldahl, la m\u00e9thode Dumas ou autorise les deux. La proc\u00e9dure exig\u00e9e peut d\u00e9pendre de la matrice de l\u2019\u00e9chantillon et du secteur d\u2019activit\u00e9.<\/p><p><strong>2. D\u00e9bit d'\u00e9chantillons<\/strong><\/p><p>Pour les laboratoires qui traitent un nombre important d\u2019\u00e9chantillons chaque jour, la m\u00e9thode Dumas peut r\u00e9duire consid\u00e9rablement le temps d\u2019analyse et les manipulations manuelles.<\/p><p><strong>3. Composition de l'\u00e9chantillon<\/strong><\/p><p>D\u00e9terminez si l\u2019\u00e9chantillon contient des compos\u00e9s azot\u00e9s inorganiques que la m\u00e9thode Kjeldahl conventionnelle ne r\u00e9cup\u00e8re pas compl\u00e8tement.<\/p><p><strong>4. S\u00e9curit\u00e9 en laboratoire<\/strong><\/p><p>La m\u00e9thode Kjeldahl n\u00e9cessite une digestion chimique et une gestion appropri\u00e9e des d\u00e9chets. La m\u00e9thode Dumas \u00e9vite les r\u00e9actifs chimiques dangereux, mais n\u00e9cessite des \u00e9quipements \u00e0 haute temp\u00e9rature et la gestion de gaz.<\/p><p><strong>5. Co\u00fbt total de possession<\/strong><\/p><p>Comparez les co\u00fbts li\u00e9s \u00e0 l'investissement en \u00e9quipement, aux consommables, \u00e0 la consommation de gaz, aux besoins en main-d'\u0153uvre, \u00e0 la maintenance et \u00e0 l'\u00e9limination des d\u00e9chets.<\/p><p>Une m\u00e9thode n\u00e9cessitant un investissement initial plus \u00e9lev\u00e9 peut offrir des avantages op\u00e9rationnels significatifs sur le long terme, selon la charge de travail du laboratoire.<\/p><h2>\u00a0<\/h2>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-03ec447 e-flex e-con-boxed e-con e-parent\" data-id=\"03ec447\" data-element_type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-3e40a6e elementor-widget elementor-widget-heading\" data-id=\"3e40a6e\" data-element_type=\"widget\" id=\"readmorekjeldahldumas\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Plus d'info<\/h2>\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-729042c e-con-full e-flex e-con e-child\" data-id=\"729042c\" data-element_type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t<div class=\"elementor-element elementor-element-b92198f e-con-full e-flex e-con e-child\" data-id=\"b92198f\" data-element_type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;,&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-627e16c elementor-widget elementor-widget-heading\" data-id=\"627e16c\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<span class=\"elementor-heading-title elementor-size-default\"><a href=\"https:\/\/scispx.com\/fr\/methodes-de-determination-de-lazote\/\">M\u00e9thodes de dosage de l'azote et des prot\u00e9ines<\/a><\/span>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-21fbf2c elementor-view-default elementor-widget elementor-widget-icon\" data-id=\"21fbf2c\" data-element_type=\"widget\" data-widget_type=\"icon.default\">\n\t\t\t\t\t\t\t<div class=\"elementor-icon-wrapper\">\n\t\t\t<a class=\"elementor-icon\" href=\"https:\/\/scispx.com\/fr\/methodes-de-determination-de-lazote\/\">\n\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-arrow-right\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M190.5 66.9l22.2-22.2c9.4-9.4 24.6-9.4 33.9 0L441 239c9.4 9.4 9.4 24.6 0 33.9L246.6 467.3c-9.4 9.4-24.6 9.4-33.9 0l-22.2-22.2c-9.5-9.5-9.3-25 .4-34.3L311.4 296H24c-13.3 0-24-10.7-24-24v-32c0-13.3 10.7-24 24-24h287.4L190.9 101.2c-9.8-9.3-10-24.8-.4-34.3z\"><\/path><\/svg>\t\t\t<\/a>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-6070f45 e-con-full e-flex e-con e-child\" data-id=\"6070f45\" data-element_type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;,&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-9be76a9 elementor-widget elementor-widget-heading\" data-id=\"9be76a9\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<span class=\"elementor-heading-title elementor-size-default\"><a href=\"https:\/\/scispx.com\/fr\/determination-des-proteines-dans-lanalyse-alimentaire\/\">D\u00e9termination des prot\u00e9ines dans l\u2019analyse alimentaire<\/a><\/span>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e63fb8a elementor-view-default elementor-widget elementor-widget-icon\" data-id=\"e63fb8a\" data-element_type=\"widget\" data-widget_type=\"icon.default\">\n\t\t\t\t\t\t\t<div class=\"elementor-icon-wrapper\">\n\t\t\t<a class=\"elementor-icon\" href=\"https:\/\/scispx.com\/fr\/determination-des-proteines-dans-lanalyse-alimentaire\/\">\n\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-arrow-right\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M190.5 66.9l22.2-22.2c9.4-9.4 24.6-9.4 33.9 0L441 239c9.4 9.4 9.4 24.6 0 33.9L246.6 467.3c-9.4 9.4-24.6 9.4-33.9 0l-22.2-22.2c-9.5-9.5-9.3-25 .4-34.3L311.4 296H24c-13.3 0-24-10.7-24-24v-32c0-13.3 10.7-24 24-24h287.4L190.9 101.2c-9.8-9.3-10-24.8-.4-34.3z\"><\/path><\/svg>\t\t\t<\/a>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-11e449c e-con-full e-flex e-con e-child\" data-id=\"11e449c\" data-element_type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;,&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7f5b3e3 elementor-widget elementor-widget-heading\" data-id=\"7f5b3e3\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<span class=\"elementor-heading-title elementor-size-default\"><a href=\"https:\/\/scispx.com\/fr\/determination-des-proteines-selon-le-type-daliment\/\">D\u00e9termination des prot\u00e9ines selon le type d\u2019aliment<\/a><\/span>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8a28018 elementor-view-default elementor-widget elementor-widget-icon\" data-id=\"8a28018\" data-element_type=\"widget\" data-widget_type=\"icon.default\">\n\t\t\t\t\t\t\t<div class=\"elementor-icon-wrapper\">\n\t\t\t<a class=\"elementor-icon\" href=\"https:\/\/scispx.com\/fr\/determination-des-proteines-selon-le-type-daliment\/\">\n\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-arrow-right\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M190.5 66.9l22.2-22.2c9.4-9.4 24.6-9.4 33.9 0L441 239c9.4 9.4 9.4 24.6 0 33.9L246.6 467.3c-9.4 9.4-24.6 9.4-33.9 0l-22.2-22.2c-9.5-9.5-9.3-25 .4-34.3L311.4 296H24c-13.3 0-24-10.7-24-24v-32c0-13.3 10.7-24 24-24h287.4L190.9 101.2c-9.8-9.3-10-24.8-.4-34.3z\"><\/path><\/svg>\t\t\t<\/a>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-427a0e2 e-con-full e-flex e-con e-child\" data-id=\"427a0e2\" data-element_type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;,&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4a152e5 elementor-widget elementor-widget-heading\" data-id=\"4a152e5\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<span class=\"elementor-heading-title elementor-size-default\"><a href=\"https:\/\/scispx.com\/fr\/nitrogen-and-protein-analyzers\/\">Analyseurs d'azote et de prot\u00e9ines\n<\/a><\/span>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0a393db elementor-view-default elementor-widget elementor-widget-icon\" data-id=\"0a393db\" data-element_type=\"widget\" data-widget_type=\"icon.default\">\n\t\t\t\t\t\t\t<div class=\"elementor-icon-wrapper\">\n\t\t\t<a class=\"elementor-icon\" href=\"https:\/\/scispx.com\/fr\/nitrogen-and-protein-analyzers\/\">\n\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-arrow-right\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M190.5 66.9l22.2-22.2c9.4-9.4 24.6-9.4 33.9 0L441 239c9.4 9.4 9.4 24.6 0 33.9L246.6 467.3c-9.4 9.4-24.6 9.4-33.9 0l-22.2-22.2c-9.5-9.5-9.3-25 .4-34.3L311.4 296H24c-13.3 0-24-10.7-24-24v-32c0-13.3 10.7-24 24-24h287.4L190.9 101.2c-9.8-9.3-10-24.8-.4-34.3z\"><\/path><\/svg>\t\t\t<\/a>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-e8a3be6 e-con-full e-flex e-con e-child\" data-id=\"e8a3be6\" data-element_type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;,&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-c1d1e02 elementor-widget elementor-widget-heading\" data-id=\"c1d1e02\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<span class=\"elementor-heading-title elementor-size-default\"><a href=\"https:\/\/scispx.com\/fr\/wikispx\/how-do-you-choose-the-right-combustion-analyzer-for-your-lab\/\">Choisissez un analyseur de combustion<\/a><\/span>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1ffdd25 elementor-view-default elementor-widget elementor-widget-icon\" data-id=\"1ffdd25\" data-element_type=\"widget\" data-widget_type=\"icon.default\">\n\t\t\t\t\t\t\t<div class=\"elementor-icon-wrapper\">\n\t\t\t<a class=\"elementor-icon\" href=\"https:\/\/scispx.com\/fr\/wikispx\/how-do-you-choose-the-right-combustion-analyzer-for-your-lab\/\">\n\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-arrow-right\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M190.5 66.9l22.2-22.2c9.4-9.4 24.6-9.4 33.9 0L441 239c9.4 9.4 9.4 24.6 0 33.9L246.6 467.3c-9.4 9.4-24.6 9.4-33.9 0l-22.2-22.2c-9.5-9.5-9.3-25 .4-34.3L311.4 296H24c-13.3 0-24-10.7-24-24v-32c0-13.3 10.7-24 24-24h287.4L190.9 101.2c-9.8-9.3-10-24.8-.4-34.3z\"><\/path><\/svg>\t\t\t<\/a>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-ede8104 e-con-full e-flex e-con e-child\" data-id=\"ede8104\" data-element_type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;,&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-aa8f0f3 elementor-widget elementor-widget-heading\" data-id=\"aa8f0f3\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<span class=\"elementor-heading-title elementor-size-default\"><a href=\"https:\/\/scispx.com\/fr\/wikispx\/what-are-the-most-common-errors-in-combustion-analysis\/\">Les erreurs les plus courantes analyse combustion<\/a><\/span>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8473883 elementor-view-default elementor-widget elementor-widget-icon\" data-id=\"8473883\" data-element_type=\"widget\" data-widget_type=\"icon.default\">\n\t\t\t\t\t\t\t<div class=\"elementor-icon-wrapper\">\n\t\t\t<a class=\"elementor-icon\" href=\"https:\/\/scispx.com\/fr\/wikispx\/what-are-the-most-common-errors-in-combustion-analysis\/\">\n\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-arrow-right\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M190.5 66.9l22.2-22.2c9.4-9.4 24.6-9.4 33.9 0L441 239c9.4 9.4 9.4 24.6 0 33.9L246.6 467.3c-9.4 9.4-24.6 9.4-33.9 0l-22.2-22.2c-9.5-9.5-9.3-25 .4-34.3L311.4 296H24c-13.3 0-24-10.7-24-24v-32c0-13.3 10.7-24 24-24h287.4L190.9 101.2c-9.8-9.3-10-24.8-.4-34.3z\"><\/path><\/svg>\t\t\t<\/a>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-8996603 e-flex e-con-boxed e-con e-parent\" data-id=\"8996603\" data-element_type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-286561e e-con-full e-flex e-con e-child\" data-id=\"286561e\" data-element_type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;,&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-39555de elementor-widget__width-initial elementor-view-default elementor-widget elementor-widget-icon\" data-id=\"39555de\" data-element_type=\"widget\" data-widget_type=\"icon.default\">\n\t\t\t\t\t\t\t<div class=\"elementor-icon-wrapper\">\n\t\t\t<div class=\"elementor-icon\">\n\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-far-comment\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M256 32C114.6 32 0 125.1 0 240c0 47.6 19.9 91.2 52.9 126.3C38 405.7 7 439.1 6.5 439.5c-6.6 7-8.4 17.2-4.6 26S14.4 480 24 480c61.5 0 110-25.7 139.1-46.3C192 442.8 223.2 448 256 448c141.4 0 256-93.1 256-208S397.4 32 256 32zm0 368c-26.7 0-53.1-4.1-78.4-12.1l-22.7-7.2-19.5 13.8c-14.3 10.1-33.9 21.4-57.5 29 7.3-12.1 14.4-25.7 19.9-40.2l10.6-28.1-20.6-21.8C69.7 314.1 48 282.2 48 240c0-88.2 93.3-160 208-160s208 71.8 208 160-93.3 160-208 160z\"><\/path><\/svg>\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1b80b33 elementor-widget__width-initial elementor-widget elementor-widget-text-editor\" data-id=\"1b80b33\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h4>Discutez de votre application avec nos experts<\/h4><p>Nos Xperts se feront un plaisir de discuter de votre application et de vous aider \u00e0 trouver la solution adapt\u00e9e.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f74b4c3 elementor-widget elementor-widget-button\" data-id=\"f74b4c3\" data-element_type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"#elementor-action%3Aaction%3Dpopup%3Aopen%26settings%3DeyJpZCI6IjczNzYiLCJ0b2dnbGUiOmZhbHNlfQ%3D%3D\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Contactez nos Xperts<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-be0cf55 e-con-full e-flex e-con e-parent\" data-id=\"be0cf55\" data-element_type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t<div class=\"elementor-element elementor-element-447a04ee e-flex e-con-boxed e-con e-child\" data-id=\"447a04ee\" data-element_type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;,&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-6edee54 e-con-full e-flex e-con e-child\" data-id=\"6edee54\" data-element_type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-338053f0 elementor-widget elementor-widget-heading\" data-id=\"338053f0\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">FAQ<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-763a6d8f e-con-full e-flex e-con e-child\" data-id=\"763a6d8f\" data-element_type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-6e020536 elementor-widget elementor-widget-n-accordion\" data-id=\"6e020536\" data-element_type=\"widget\" data-settings=\"{&quot;default_state&quot;:&quot;expanded&quot;,&quot;max_items_expended&quot;:&quot;one&quot;,&quot;n_accordion_animation_duration&quot;:{&quot;unit&quot;:&quot;ms&quot;,&quot;size&quot;:400,&quot;sizes&quot;:[]}}\" data-widget_type=\"nested-accordion.default\">\n\t\t\t\t\t\t\t<div class=\"e-n-accordion\" aria-label=\"Accord\u00e9on. Ouvrez les liens avec Enter ou Space, fermez-les avec Escape et naviguez avec les touches fl\u00e9ch\u00e9es.\">\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-1840\" class=\"e-n-accordion-item\" open>\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"1\" tabindex=\"0\" aria-expanded=\"true\" aria-controls=\"e-n-accordion-item-1840\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><div class=\"e-n-accordion-item-title-text\"> Quelle est la principale diff\u00e9rence entre les m\u00e9thodes de Kjeldahl et de Dumas ? <\/div><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-minus\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h384c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-plus\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H272V64c0-17.67-14.33-32-32-32h-32c-17.67 0-32 14.33-32 32v144H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h144v144c0 17.67 14.33 32 32 32h32c17.67 0 32-14.33 32-32V304h144c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-1840\" class=\"elementor-element elementor-element-99ab562 e-con-full e-flex e-con e-child\" data-id=\"99ab562\" data-element_type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-3330b675 elementor-widget elementor-widget-text-editor\" data-id=\"3330b675\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p data-pm-slice=\"1 1 []\">La m\u00e9thode Kjeldahl d\u00e9termine l\u2019azote par digestion chimique, distillation et titrage. La m\u00e9thode Dumas utilise une combustion \u00e0 haute temp\u00e9rature suivie d\u2019une d\u00e9tection des gaz. La m\u00e9thode Dumas est g\u00e9n\u00e9ralement plus rapide et mesure une gamme plus large de compos\u00e9s azot\u00e9s.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-1841\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"2\" tabindex=\"-1\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-1841\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><div class=\"e-n-accordion-item-title-text\"> La m\u00e9thode Dumas est-elle meilleure que la m\u00e9thode Kjeldahl ? <\/div><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-minus\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h384c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-plus\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H272V64c0-17.67-14.33-32-32-32h-32c-17.67 0-32 14.33-32 32v144H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h144v144c0 17.67 14.33 32 32 32h32c17.67 0 32-14.33 32-32V304h144c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-1841\" class=\"elementor-element elementor-element-71b090e2 e-con-full e-flex e-con e-child\" data-id=\"71b090e2\" data-element_type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-73bb6e4c elementor-widget elementor-widget-text-editor\" data-id=\"73bb6e4c\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p data-pm-slice=\"1 1 []\">Pas n\u00e9cessairement. La m\u00e9thode Dumas offre des avantages en termes de rapidit\u00e9, d\u2019automatisation et de r\u00e9duction des d\u00e9chets chimiques. Cependant, la m\u00e9thode Kjeldahl reste importante lorsque les normes analytiques applicables l\u2019exigent sp\u00e9cifiquement.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-1842\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"3\" tabindex=\"-1\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-1842\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><div class=\"e-n-accordion-item-title-text\"> La m\u00e9thode Dumas mesure-t-elle directement les prot\u00e9ines ? <\/div><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-minus\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h384c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-plus\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H272V64c0-17.67-14.33-32-32-32h-32c-17.67 0-32 14.33-32 32v144H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h144v144c0 17.67 14.33 32 32 32h32c17.67 0 32-14.33 32-32V304h144c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-1842\" class=\"elementor-element elementor-element-13f8e65d e-con-full e-flex e-con e-child\" data-id=\"13f8e65d\" data-element_type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-12ab8c3d elementor-widget elementor-widget-text-editor\" data-id=\"12ab8c3d\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p data-pm-slice=\"1 1 []\">Non. La m\u00e9thode Dumas mesure la teneur en azote. Les laboratoires calculent ensuite la teneur en prot\u00e9ines brutes en appliquant un facteur de conversion azote-prot\u00e9ines appropri\u00e9. La m\u00e9thode Kjeldahl repose sur le m\u00eame principe g\u00e9n\u00e9ral.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-1843\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"4\" tabindex=\"-1\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-1843\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><div class=\"e-n-accordion-item-title-text\"> Quelle m\u00e9thode est la plus rapide : celle de Kjeldahl ou celle de Dumas ? <\/div><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-minus\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h384c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-plus\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H272V64c0-17.67-14.33-32-32-32h-32c-17.67 0-32 14.33-32 32v144H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h144v144c0 17.67 14.33 32 32 32h32c17.67 0 32-14.33 32-32V304h144c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-1843\" class=\"elementor-element elementor-element-83c17dd e-flex e-con-boxed e-con e-child\" data-id=\"83c17dd\" data-element_type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a1a9f6b elementor-widget elementor-widget-text-editor\" data-id=\"a1a9f6b\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p data-pm-slice=\"1 1 []\">La m\u00e9thode Dumas est g\u00e9n\u00e9ralement la plus rapide. De nombreux instruments modernes r\u00e9alisent une analyse en environ 3 \u00e0 5 minutes. Une analyse compl\u00e8te selon la m\u00e9thode Kjeldahl n\u00e9cessite souvent plusieurs heures, m\u00eame si l\u2019automatisation et le traitement par lots peuvent am\u00e9liorer la productivit\u00e9.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-1844\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"5\" tabindex=\"-1\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-1844\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><div class=\"e-n-accordion-item-title-text\"> Pourquoi la m\u00e9thode Dumas peut-elle donner des r\u00e9sultats d\u2019azote plus \u00e9lev\u00e9s que la m\u00e9thode Kjeldahl ? <\/div><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-minus\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h384c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-plus\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H272V64c0-17.67-14.33-32-32-32h-32c-17.67 0-32 14.33-32 32v144H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h144v144c0 17.67 14.33 32 32 32h32c17.67 0 32-14.33 32-32V304h144c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-1844\" class=\"elementor-element elementor-element-f33141c e-flex e-con-boxed e-con e-child\" data-id=\"f33141c\" data-element_type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2071426 elementor-widget elementor-widget-text-editor\" data-id=\"2071426\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p data-pm-slice=\"1 1 []\">La m\u00e9thode Dumas mesure g\u00e9n\u00e9ralement une gamme plus large de compos\u00e9s azot\u00e9s, y compris certaines formes d\u2019azote inorganique. La m\u00e9thode Kjeldahl conventionnelle ne r\u00e9cup\u00e8re pas compl\u00e8tement les nitrates et les nitrites sans traitement suppl\u00e9mentaire.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>Kjeldahl ou Dumas : quelle m\u00e9thode de dosage de l'azote convient le mieux \u00e0 votre laboratoire ? Contactez nos experts Quelle m\u00e9thode de dosage de l'azote convient le mieux \u00e0 votre laboratoire ? Autres applications dans le secteur agroalimentaire Le dosage de l'azote est essentiel dans les analyses des denr\u00e9es alimentaires et des aliments pour animaux, en agriculture, dans les laboratoires environnementaux et dans l'industrie chimique. Mais comment choisir entre les deux m\u00e9thodes : Kjeldahl ou Dumas ? Les deux [\u2026]<\/p>","protected":false},"author":171,"featured_media":4889,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_mo_disable_npp":"","footnotes":""},"class_list":["post-4861","page","type-page","status-publish","has-post-thumbnail","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Kjeldahl vs. Dumas | Differences, methods and applications<\/title>\n<meta name=\"description\" content=\"Dumas analysis, Dumas method, Kjeldahl method, nitrogen determination, protein determination, Dumas vs Kjeldahl, nitrogen analysis.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/scispx.com\/fr\/kjeldahl-vs-dumas\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" 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