{"id":3969,"date":"2023-05-05T12:07:00","date_gmt":"2023-05-05T16:07:00","guid":{"rendered":"https:\/\/dev26.lecowebtest.com\/news\/\/"},"modified":"2026-09-08T15:57:04","modified_gmt":"2026-09-08T19:57:04","slug":"kjeldahl-contre-dumas-pour-determiner-les-proteines","status":"publish","type":"post","link":"https:\/\/www.leco.com\/fr\/news\/kjeldahl-vs-dumas-determining-protein\/","title":{"rendered":"Kjeldahl contre Dumas : la d\u00e9termination de la teneur en prot\u00e9ines"},"content":{"rendered":"<div class=\"wp-block-group is-style-leco-vertical-margin-top has-global-padding is-layout-constrained wp-container-core-group-is-layout-875e403b wp-block-group-is-layout-constrained\">\n<div class=\"wp-block-group is-nowrap is-layout-flex wp-container-core-group-is-layout-1ffe0ea6 wp-block-group-is-layout-flex\">\n<p class=\"wp-block-paragraph\">Publi\u00e9 le<\/p>\n\n\n<div style=\"line-height:1;margin-left:4px;margin-top:13px\" class=\"wp-block-post-date has-custom-1-font-size\"><time datetime=\"2023-05-05T12:07:00-04:00\">5 mai 2023<\/time><\/div><\/div>\n\n\n\n<h1 class=\"wp-block-heading is-style-h2-style\">Kjeldahl contre Dumas : la d\u00e9termination de la teneur en prot\u00e9ines<\/h1>\n<\/div>\n\n\n\n<div class=\"wp-block-group has-global-padding is-layout-constrained wp-block-group-is-layout-constrained\"><figure class=\"is-style-rounded wp-block-post-featured-image\"><img loading=\"lazy\" decoding=\"async\" width=\"1280\" height=\"720\" src=\"https:\/\/www.leco.com\/wp-content\/uploads\/2023\/05\/cocoa-soy-protein-powder.webp\" class=\"attachment-post-thumbnail size-post-thumbnail wp-post-image\" alt=\"de la poudre de prot\u00e9ine dans une cuill\u00e8re\" style=\"object-fit:cover;\" srcset=\"https:\/\/www.leco.com\/wp-content\/uploads\/2023\/05\/cocoa-soy-protein-powder.webp 1280w, https:\/\/www.leco.com\/wp-content\/uploads\/2023\/05\/cocoa-soy-protein-powder-300x169.webp 300w, https:\/\/www.leco.com\/wp-content\/uploads\/2023\/05\/cocoa-soy-protein-powder-1024x576.webp 1024w, https:\/\/www.leco.com\/wp-content\/uploads\/2023\/05\/cocoa-soy-protein-powder-768x432.webp 768w, https:\/\/www.leco.com\/wp-content\/uploads\/2023\/05\/cocoa-soy-protein-powder-18x10.webp 18w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\"><\/figure><\/div>\n\n\n\n<div class=\"wp-block-group has-global-padding is-layout-constrained wp-container-core-group-is-layout-1ea9787f wp-block-group-is-layout-constrained\" style=\"margin-top:48px\">\n<div class=\"leco-share-article align-left wp-block-create-block-leco-share-article\">\n\t<div class=\"share-article-wrapper\">\n\t\t<button class=\"share-article-button\" data-url=\"https:\/\/www.leco.com\/fr\/news\/kjeldahl-vs-dumas-determining-protein\/\" aria-label=\"Partager l&#039;article\">\n\t\t\tPartager l'article\t\t<\/button>\n\t\t<span class=\"share-article-copied\" aria-live=\"polite\" aria-atomic=\"true\">\n\t\t\tLien de l'article copi\u00e9\t\t<\/span>\n\t<\/div>\n<\/div>\n\n\n<div class=\"wp-block-group has-global-padding is-layout-constrained wp-block-group-is-layout-constrained\" style=\"margin-top:0\">\n<hr class=\"wp-block-separator has-text-color has-sl-1-color has-alpha-channel-opacity has-sl-1-background-color has-background has-base-100-color has-base-100-background-color is-style-default\" style=\"margin-top:60px;margin-bottom:60px\">\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Depuis sa mise au point en 1883, la m\u00e9thode de Kjeldahl pour la d\u00e9termination des prot\u00e9ines \u00e9tait la norme dans les laboratoires du monde entier. Ce n\u2019est que dans les ann\u00e9es 1990 que la m\u00e9thode de Dumas a commenc\u00e9 \u00e0 s\u2019imposer. Bien que la m\u00e9thode de Dumas soit techniquement plus ancienne que celle de Kjeldahl, ce n\u2019est que gr\u00e2ce aux r\u00e9centes avanc\u00e9es technologiques qu\u2019elle est devenue facilement accessible aux laboratoires, et \u201c facilement accessible \u201d est certainement une fa\u00e7on de d\u00e9crire la m\u00e9thode moderne de Dumas pour la d\u00e9termination des prot\u00e9ines \u2014 en particulier telle que la met en \u0153uvre LECO !<\/p>\n\n\n\n<div class=\"wp-block-group has-global-padding is-layout-constrained wp-block-group-is-layout-constrained\">\n<figure class=\"wp-block-image size-full is-resized is-style-rounded-full-width\"><img loading=\"lazy\" decoding=\"async\" width=\"1280\" height=\"720\" src=\"https:\/\/www.leco.com\/wp-content\/uploads\/2026\/03\/leco-fp828-nitrogen-protein-determination.webp\" alt=\"D\u00e9termination de la prot\u00e9ine LECO FP828\" class=\"wp-image-3461\" style=\"width:786px;height:auto\" srcset=\"https:\/\/www.leco.com\/wp-content\/uploads\/2026\/03\/leco-fp828-nitrogen-protein-determination.webp 1280w, https:\/\/www.leco.com\/wp-content\/uploads\/2026\/03\/leco-fp828-nitrogen-protein-determination-300x169.webp 300w, https:\/\/www.leco.com\/wp-content\/uploads\/2026\/03\/leco-fp828-nitrogen-protein-determination-1024x576.webp 1024w, https:\/\/www.leco.com\/wp-content\/uploads\/2026\/03\/leco-fp828-nitrogen-protein-determination-768x432.webp 768w, https:\/\/www.leco.com\/wp-content\/uploads\/2026\/03\/leco-fp828-nitrogen-protein-determination-18x10.webp 18w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/figure>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">La m\u00e9thode de Kjeldahl a \u00e9t\u00e9 un processus laborieux et chronophage d\u00e8s le d\u00e9but. En tant que m\u00e9thode classique de min\u00e9ralisation par voie humide, elle exigeait l'existence d'un laboratoire de chimie humide et d'un technicien de laboratoire form\u00e9 \u00e0 l'analyse, ainsi que de r\u00e9actifs acides et basiques forts n\u00e9cessitant une gestion des hottes et une \u00e9limination des d\u00e9chets. Une seule analyse d'\u00e9chantillon pouvait prendre des heures. \u00c0 mesure que les r\u00e9glementations de s\u00e9curit\u00e9 se sont renforc\u00e9es, certains des catalyseurs de Kjeldahl les plus efficaces ont \u00e9t\u00e9 abandonn\u00e9s, ce qui a entra\u00een\u00e9 une r\u00e9cup\u00e9ration d'azote plus faible pendant la phase de min\u00e9ralisation et un biais d'azote plus faible.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D'autre part, la m\u00e9thode de Dumas \u00e9tait une m\u00e9thode bas\u00e9e sur la combustion, utilisant l'oxyg\u00e8ne pour convertir l'azote prot\u00e9ique en N<sub>2<\/sub>\/NON<sub>X<\/sub>\u00a0gaz. Le NO<sub>X<\/sub> est r\u00e9duit \u00e0 N<sub>2<\/sub>, et le reste des gaz de combustion est filtr\u00e9, ne laissant que du N<sub>2<\/sub> pour \u00eatre mesur\u00e9 par un d\u00e9tecteur \u00e0 conductivit\u00e9 thermique (TCD).<\/p>\n\n\n\n<div class=\"wp-block-group has-global-padding is-layout-constrained wp-block-group-is-layout-constrained\">\n<figure class=\"wp-block-image size-full is-resized is-style-rounded-full-width\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"534\" src=\"https:\/\/www.leco.com\/wp-content\/uploads\/2026\/01\/leco-news-kjeldahl-vs-dumas-828-series-sample-carousel-012126.jpg\" alt=\"LECO - Actualit\u00e9s - Kjeldahl vs Dumas - Carrousel d&#x27;\u00e9chantillons s\u00e9rie 828\" class=\"wp-image-1387\" style=\"width:786px;height:auto\" srcset=\"https:\/\/www.leco.com\/wp-content\/uploads\/2026\/01\/leco-news-kjeldahl-vs-dumas-828-series-sample-carousel-012126.jpg 800w, https:\/\/www.leco.com\/wp-content\/uploads\/2026\/01\/leco-news-kjeldahl-vs-dumas-828-series-sample-carousel-012126-300x200.jpg 300w, https:\/\/www.leco.com\/wp-content\/uploads\/2026\/01\/leco-news-kjeldahl-vs-dumas-828-series-sample-carousel-012126-768x513.jpg 768w, https:\/\/www.leco.com\/wp-content\/uploads\/2026\/01\/leco-news-kjeldahl-vs-dumas-828-series-sample-carousel-012126-18x12.jpg 18w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/figure>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Les analyseurs de prot\u00e9ines de LECO, les <a href=\"https:\/\/www.leco.com\/fr\/instrument\/analyseurs-elementaires-organiques\/\" data-type=\"instrument\" data-id=\"2228\">FP828 et FP928<\/a>, sont con\u00e7us pour simplifier ce processus. Contrairement aux anciens instruments Dumas, ces deux appareils effectuent la combustion dans un environnement riche en oxyg\u00e8ne, ce qui signifie qu'il n'est jamais n\u00e9cessaire de doser l'oxyg\u00e8ne ni, en fait, de modifier les m\u00e9thodes en fonction du type d'\u00e9chantillon analys\u00e9. Les m\u00e9thodes d'introduction des \u00e9chantillons et les auto-\u00e9chantillonneurs sont capables de traiter \u00e0 la fois des \u00e9chantillons liquides et solides en utilisant des capsules de g\u00e9latine ou d'\u00e9tain, ou des nacelles en c\u00e9ramique r\u00e9utilisables.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Gr\u00e2ce \u00e0 l&#x27;efficacit\u00e9 de l&#x27;instrument et aux consommables LECO con\u00e7us pour optimiser ses performances, le FP828 est capable d&#x27;analyser un \u00e9chantillon en moins de trois minutes. Il s&#x27;agit d&#x27;une am\u00e9lioration consid\u00e9rable par rapport aux plusieurs heures requises par la m\u00e9thode de Kjeldahl, ce qui se traduit par une augmentation massive du d\u00e9bit. Gr\u00e2ce \u00e0 la quantit\u00e9 limit\u00e9e de r\u00e9actifs et de consommables n\u00e9cessaires par analyse, les fours de combustion LECO ont permis de r\u00e9duire le co\u00fbt par analyse ; ils peuvent m\u00eame \u00eatre configur\u00e9s pour utiliser de l\u2019argon \u00e0 la place de l\u2019h\u00e9lium, actuellement on\u00e9reux, sans qu\u2019aucune modification mat\u00e9rielle ne soit n\u00e9cessaire.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Le LECO FP828 est si simple \u00e0 utiliser qu&#x27;il ne faut m\u00eame pas <em>Besoin<\/em> un laboratoire ou un technicien de laboratoire form\u00e9 \u00e0 l'analyse pour r\u00e9ussir.<\/p>\n\n\n\n<div class=\"wp-block-group has-global-padding is-layout-constrained wp-block-group-is-layout-constrained\" style=\"margin-top:0\">\n<hr class=\"wp-block-separator has-text-color has-sl-1-color has-alpha-channel-opacity has-sl-1-background-color has-background has-base-100-color has-base-100-background-color is-style-default\" style=\"margin-top:60px;margin-bottom:60px\">\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading is-style-h4-style\">En savoir plus<\/h2>\n\n\n<div class=\"leco-event-rows wp-block-create-block-leco-event-rows\">\n\t\t<div class=\"leco-event-rows__row\">\n\t\t<div class=\"leco-event-rows__split\">\n\n\t\t\t<!-- Left: Featured image -->\n\t\t\t<div class=\"leco-event-rows__image-col\">\n\t\t\t\t<figure class=\"wp-block-image size-full is-style-rounded-full-width\">\n\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.leco.com\/wp-content\/uploads\/2026\/04\/protein-nuts-and-cheese-1024x307.jpg\" alt=\"LECO propose des instruments de pointe pour l&#x27;analyse des prot\u00e9ines destin\u00e9s aux laboratoires sp\u00e9cialis\u00e9s dans l&#x27;alimentation humaine et animale, les produits laitiers, les c\u00e9r\u00e9ales et l&#x27;agriculture. Sur cette image, les fruits \u00e0 coque, le fromage, le poisson et le brocoli sont des sources de prot\u00e9ines.\" style=\"aspect-ratio:4\/3;object-fit:cover\">\n\t\t\t\t<\/figure>\n\t\t\t<\/div>\n\n\t\t\t<!-- Right: Content -->\n\t\t\t<div class=\"leco-event-rows__content-col\">\n\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t<div class=\"leco-event-rows__excerpt\">\n\t\t\t\t\t\tPour en savoir plus sur ces d\u00e9termins de prot\u00e9ines et voir une d\u00e9monstration du FP828 analysant un \u00e9chantillon solide et un \u00e9chantillon liquide, vous pouvez visionner le webinaire \u00e0 la demande : <a href=\"https:\/\/www.leco.com\/fr\/evenements\/webinaire\/kjeldahl-contre-dumas-comment-determiner-les-proteines\/\" data-type=\"event\" data-id=\"3818\"><em>Kjeldahl vs Dumas : Comment d\u00e9terminer les prot\u00e9ines ?<\/em><\/a>\t\t\t\t\t<\/div>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t<p class=\"leco-event-rows__date\">\n\t\t\t\t\t\tOn Demand\t\t\t\t\t<\/p>\n\t\t\t\t\n\t\t\t\t<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n\t\t\t\t\t<div class=\"wp-block-button\">\n\t\t\t\t\t\t<a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/www.leco.com\/fr\/events\/webinar\/kjeldahl-vs-dumas-how-do-you-determine-protein\/\">\n\t\t\t\t\t\t\tS'inscrire au webinaire\t\t\t\t\t\t<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\n\t\t\t<\/div>\n\t\t<\/div>\n\t<\/div>\n\t<\/div>\n\n\n<div class=\"wp-block-group has-global-padding is-layout-constrained wp-block-group-is-layout-constrained\" style=\"margin-top:0\">\n<hr class=\"wp-block-separator has-text-color has-sl-1-color has-alpha-channel-opacity has-sl-1-background-color has-background has-base-100-color has-base-100-background-color is-style-default\" style=\"margin-top:60px;margin-bottom:60px\">\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading is-style-h4-style\">Instruments utilis\u00e9s<\/h3>\n\n\n\n<div class=\"leco-card-grid-block wp-block-create-block-leco-card-grid\">\n\t<div class=\"leco-card-grid columns-2\" role=\"list\" aria-label=\"Card grid\">\n\t\t\n\t\t\t\t\t<a href=\"https:\/\/www.leco.com\/fr\/instrument\/analyseurs-elementaires-organiques\/\" class=\"leco-card\" role=\"listitem\" aria-label=\"828\/928 Series - Click to learn more\">\n\t\t\n\t\t\t<!-- Card Image -->\n\t\t\t<div class=\"leco-card-image\" role=\"img\" aria-label=\"LECO CHN928 : Dosage du carbone, de l&#x27;hydrog\u00e8ne et de l&#x27;azote\">\n\t\t\t\t\t\t\t\t\t<img src=\"https:\/\/www.leco.com\/wp-content\/uploads\/2026\/03\/leco-chn928-carbon-hydrogen-nitrogen-determination.webp\" srcset=\"https:\/\/www.leco.com\/wp-content\/uploads\/2026\/03\/leco-chn928-carbon-hydrogen-nitrogen-determination-1024x576.webp 1024w, https:\/\/www.leco.com\/wp-content\/uploads\/2026\/03\/leco-chn928-carbon-hydrogen-nitrogen-determination-768x432.webp 768w, https:\/\/www.leco.com\/wp-content\/uploads\/2026\/03\/leco-chn928-carbon-hydrogen-nitrogen-determination-300x169.webp 300w, https:\/\/www.leco.com\/wp-content\/uploads\/2026\/03\/leco-chn928-carbon-hydrogen-nitrogen-determination.webp 1280w\" sizes=\"(max-width: 768px) 100vw, (max-width: 1200px) 50vw, 371px\" alt=\"LECO CHN928 : Dosage du carbone, de l&#x27;hydrog\u00e8ne et de l&#x27;azote\" class=\"leco-card-img\" loading=\"lazy\" decoding=\"sync\">\n\t\t\t\t\t\t\t<\/div>\n\n\t\t\t<!-- Card Content -->\n\t\t\t<div class=\"leco-card-content\">\n\t\t\t\t\t\t\t\t\t<h3 class=\"leco-card-title\">\n\t\t\t\t\t\tS\u00e9rie 828\/928\t\t\t\t\t<\/h3>\n\t\t\t\t\n\t\t\t\t<div class=\"leco-card-bottom\">\n\t\t\t\t\t\t\t\t\t\t\t<p class=\"leco-card-description\">\n\t\t\t\t\t\t\tAnalyse de carbone, d'hydrog\u00e8ne, d'azote, de soufre et de prot\u00e9ines des mati\u00e8res organiques\t\t\t\t\t\t<\/p>\n\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t<div class=\"leco-card-link\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t<svg class=\"leco-card-arrow\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"44\" height=\"44\" viewbox=\"0 0 44 44\" fill=\"none\" focusable=\"false\">\n\t\t\t\t\t\t\t\t<path d=\"M12.7998 22C12.7998 22.5523 13.2475 23 13.7998 23L27.3857 23L21.7998 28.5859C21.4093 28.9764 21.4093 29.6095 21.7998 30C22.1903 30.3905 22.8234 30.3905 23.2139 30L30.5068 22.7071C30.8973 22.3166 30.8973 21.6834 30.5068 21.2929L23.2139 14C22.8234 13.6095 22.1903 13.6095 21.7998 14C21.4093 14.3905 21.4093 15.0236 21.7998 15.4141L27.3857 21L13.7998 21C13.2475 21 12.7998 21.4477 12.7998 22Z\" fill=\"#78543D\"><\/path>\n\t\t\t\t\t\t\t<\/svg>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t<\/div>\n\n\t\t\t\t\t<\/a>\n\t\t\n\t\t\t<\/div>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-group has-global-padding is-layout-constrained wp-block-group-is-layout-constrained\">\n<div class=\"wp-block-group is-style-full-bleed has-global-padding is-layout-constrained wp-block-group-is-layout-constrained\">\n<div class=\"wp-block-group has-global-padding is-layout-constrained wp-block-group-is-layout-constrained\" style=\"margin-top:0\">\n<hr class=\"wp-block-separator has-text-color has-sl-1-color has-alpha-channel-opacity has-sl-1-background-color has-background has-base-100-color has-base-100-background-color is-style-default\" style=\"margin-top:60px;margin-bottom:60px\">\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading is-style-h4-style\">Nouvelles connexes<\/h2>\n\n\n\n<div class=\"wp-block-query is-layout-flow wp-block-query-is-layout-flow\"><ul class=\"columns-3 wp-block-post-template is-layout-grid wp-container-core-post-template-is-layout-1d17308c wp-block-post-template-is-layout-grid\"><li class=\"wp-block-post post-7271 post type-post status-publish format-standard has-post-thumbnail hentry category-news\">\n\n<div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><figure style=\"aspect-ratio:16\/9\" class=\"is-style-rounded wp-block-post-featured-image\"><a href=\"https:\/\/www.leco.com\/fr\/news\/pegasus-btx-mass-spec-coolest-thing-michigan-award\/\" target=\"_self\"><img loading=\"lazy\" decoding=\"async\" width=\"1280\" height=\"720\" src=\"https:\/\/www.leco.com\/wp-content\/uploads\/2026\/09\/Featured-Blog-Images.png\" class=\"attachment-post-thumbnail size-post-thumbnail wp-post-image\" alt=\"LECO Pegasus\u00ae BTX Mass Spectrometer Nominated for \u201cCoolest Thing Made in Michigan\u201d Award\" style=\"width:100%;height:100%;object-fit:cover;\" srcset=\"https:\/\/www.leco.com\/wp-content\/uploads\/2026\/09\/Featured-Blog-Images.png 1280w, https:\/\/www.leco.com\/wp-content\/uploads\/2026\/09\/Featured-Blog-Images-300x169.png 300w, https:\/\/www.leco.com\/wp-content\/uploads\/2026\/09\/Featured-Blog-Images-1024x576.png 1024w, https:\/\/www.leco.com\/wp-content\/uploads\/2026\/09\/Featured-Blog-Images-768x432.png 768w, https:\/\/www.leco.com\/wp-content\/uploads\/2026\/09\/Featured-Blog-Images-18x10.png 18w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\"><\/a><\/figure>\n\n<h3 style=\"font-style:normal;font-weight:300\" class=\"has-link-color wp-elements-a886519ae13d3c55929ef374b8bceb2d wp-block-post-title has-text-color has-dm-8-color has-medium-font-size has-rothek-font-family\"><a href=\"https:\/\/www.leco.com\/fr\/news\/pegasus-btx-mass-spec-coolest-thing-michigan-award\/\" target=\"_self\">LECO Pegasus\u00ae BTX Mass Spectrometer Nominated for \u201cCoolest Thing Made in Michigan\u201d Award<\/a><\/h3>\n\n<div class=\"wp-block-post-date\"><time datetime=\"2026-09-11T16:12:37-04:00\">11 septembre 2026<\/time><\/div><\/div>\n\n<\/li><li class=\"wp-block-post post-7201 post type-post status-publish format-standard has-post-thumbnail hentry category-news tag-gcxgc tag-microplastics tag-pyrolysis tag-thermal-desorption instrument-model-hrt4d core-analysis-type-gc-mass-spectrometry application-type-environmental product-line-mass-spectrometry\">\n\n<div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><figure style=\"aspect-ratio:16\/9\" class=\"is-style-rounded wp-block-post-featured-image\"><a href=\"https:\/\/www.leco.com\/fr\/news\/microplastic-analysis-methods-with-thermal-desorption-and-pyrolysis-gcxgc-tofms\/\" target=\"_self\"><img loading=\"lazy\" decoding=\"async\" width=\"1800\" height=\"600\" src=\"https:\/\/www.leco.com\/wp-content\/uploads\/2026\/09\/Featured-Blog-Image-Microplastics.png\" class=\"attachment-post-thumbnail size-post-thumbnail wp-post-image\" alt=\"Surpassing the Limits of Traditional Microplastic Analysis Methods with Thermal Desorption and Pyrolysis GCxGC-TOFMS\" style=\"width:100%;height:100%;object-fit:cover;\" srcset=\"https:\/\/www.leco.com\/wp-content\/uploads\/2026\/09\/Featured-Blog-Image-Microplastics.png 1800w, https:\/\/www.leco.com\/wp-content\/uploads\/2026\/09\/Featured-Blog-Image-Microplastics-300x100.png 300w, https:\/\/www.leco.com\/wp-content\/uploads\/2026\/09\/Featured-Blog-Image-Microplastics-1024x341.png 1024w, https:\/\/www.leco.com\/wp-content\/uploads\/2026\/09\/Featured-Blog-Image-Microplastics-768x256.png 768w, https:\/\/www.leco.com\/wp-content\/uploads\/2026\/09\/Featured-Blog-Image-Microplastics-1536x512.png 1536w, https:\/\/www.leco.com\/wp-content\/uploads\/2026\/09\/Featured-Blog-Image-Microplastics-18x6.png 18w\" sizes=\"auto, (max-width: 1800px) 100vw, 1800px\"><\/a><\/figure>\n\n<h3 style=\"font-style:normal;font-weight:300\" class=\"has-link-color wp-elements-a886519ae13d3c55929ef374b8bceb2d wp-block-post-title has-text-color has-dm-8-color has-medium-font-size has-rothek-font-family\"><a href=\"https:\/\/www.leco.com\/fr\/news\/microplastic-analysis-methods-with-thermal-desorption-and-pyrolysis-gcxgc-tofms\/\" target=\"_self\">Surpassing the Limits of Traditional Microplastic Analysis Methods with Thermal Desorption and Pyrolysis GCxGC-TOFMS<\/a><\/h3>\n\n<div class=\"wp-block-post-date\"><time datetime=\"2026-09-01T14:06:38-04:00\">1 septembre 2026<\/time><\/div><\/div>\n\n<\/li><li class=\"wp-block-post post-4219 post type-post status-publish format-standard has-post-thumbnail hentry category-news instrument-model-58 core-analysis-type-carbon application-type-environmental application-type-soil-analysis product-line-elemental-analysis\">\n\n<div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><figure style=\"aspect-ratio:16\/9\" class=\"is-style-rounded wp-block-post-featured-image\"><a href=\"https:\/\/www.leco.com\/fr\/news\/role-of-toc-in-regenerative-agriculture\/\" target=\"_self\"><img loading=\"lazy\" decoding=\"async\" width=\"1280\" height=\"720\" src=\"https:\/\/www.leco.com\/wp-content\/uploads\/2026\/08\/two-farmers-in-red-discuss-soil.webp\" class=\"attachment-post-thumbnail size-post-thumbnail wp-post-image\" alt=\"L&#039;importance de l&#039;analyse du carbone organique total dans le sol en agriculture r\u00e9g\u00e9n\u00e9ratrice\" style=\"width:100%;height:100%;object-fit:cover;\" srcset=\"https:\/\/www.leco.com\/wp-content\/uploads\/2026\/08\/two-farmers-in-red-discuss-soil.webp 1280w, https:\/\/www.leco.com\/wp-content\/uploads\/2026\/08\/two-farmers-in-red-discuss-soil-300x169.webp 300w, https:\/\/www.leco.com\/wp-content\/uploads\/2026\/08\/two-farmers-in-red-discuss-soil-1024x576.webp 1024w, https:\/\/www.leco.com\/wp-content\/uploads\/2026\/08\/two-farmers-in-red-discuss-soil-768x432.webp 768w, https:\/\/www.leco.com\/wp-content\/uploads\/2026\/08\/two-farmers-in-red-discuss-soil-18x10.webp 18w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\"><\/a><\/figure>\n\n<h3 style=\"font-style:normal;font-weight:300\" class=\"has-link-color wp-elements-a886519ae13d3c55929ef374b8bceb2d wp-block-post-title has-text-color has-dm-8-color has-medium-font-size has-rothek-font-family\"><a href=\"https:\/\/www.leco.com\/fr\/news\/role-of-toc-in-regenerative-agriculture\/\" target=\"_self\">L'importance de l'analyse du carbone organique total dans le sol en agriculture r\u00e9g\u00e9n\u00e9ratrice<\/a><\/h3>\n\n<div class=\"wp-block-post-date\"><time datetime=\"2026-08-05T08:16:00-04:00\">5 ao\u00fbt 2026<\/time><\/div><\/div>\n\n<\/li><\/ul><\/div>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Published on Kjeldahl vs Dumas: Determining Protein Ever since its development in 1883, the Kjeldahl method of protein determination had been the standard in laboratories across the world. It wasn\u2019t until the 1990s that the Dumas method began acquiring a foothold. Though the Dumas method was technically older than the Kjeldahl, only recent technological developments [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":5202,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"instrument-model":[57,61],"core-analysis-type":[23],"application-type":[35],"product-line":[14,15],"class_list":["post-3969","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","instrument-model-57","instrument-model-61","core-analysis-type-nitrogen","application-type-protein-analysis","product-line-elemental-analysis","product-line-thermal-analysis"],"_links":{"self":[{"href":"https:\/\/www.leco.com\/fr\/wp-json\/wp\/v2\/posts\/3969","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.leco.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.leco.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.leco.com\/fr\/wp-json\/wp\/v2\/users\/9"}],"replies":[{"embeddable":true,"href":"https:\/\/www.leco.com\/fr\/wp-json\/wp\/v2\/comments?post=3969"}],"version-history":[{"count":2,"href":"https:\/\/www.leco.com\/fr\/wp-json\/wp\/v2\/posts\/3969\/revisions"}],"predecessor-version":[{"id":7266,"href":"https:\/\/www.leco.com\/fr\/wp-json\/wp\/v2\/posts\/3969\/revisions\/7266"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.leco.com\/fr\/wp-json\/wp\/v2\/media\/5202"}],"wp:attachment":[{"href":"https:\/\/www.leco.com\/fr\/wp-json\/wp\/v2\/media?parent=3969"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.leco.com\/fr\/wp-json\/wp\/v2\/categories?post=3969"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.leco.com\/fr\/wp-json\/wp\/v2\/tags?post=3969"},{"taxonomy":"instrument-model","embeddable":true,"href":"https:\/\/www.leco.com\/fr\/wp-json\/wp\/v2\/instrument-model?post=3969"},{"taxonomy":"core-analysis-type","embeddable":true,"href":"https:\/\/www.leco.com\/fr\/wp-json\/wp\/v2\/core-analysis-type?post=3969"},{"taxonomy":"application-type","embeddable":true,"href":"https:\/\/www.leco.com\/fr\/wp-json\/wp\/v2\/application-type?post=3969"},{"taxonomy":"product-line","embeddable":true,"href":"https:\/\/www.leco.com\/fr\/wp-json\/wp\/v2\/product-line?post=3969"}],"curies":[{"name":"Bien jou\u00e9","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}