{"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-vs-dumas-proteinbestimmung","status":"publish","type":"post","link":"https:\/\/www.leco.com\/de\/news\/kjeldahl-vs-dumas-determining-protein\/","title":{"rendered":"Kjeldahl vs. Dumas: Proteinbestimmung"},"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\">Ver\u00f6ffentlicht am<\/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 vs. Dumas: Proteinbestimmung<\/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=\"Proteinpulver auf einem L\u00f6ffel\" 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\/de\/news\/kjeldahl-vs-dumas-determining-protein\/\" aria-label=\"Artikel teilen\">\n\t\t\tArtikel teilen\t\t<\/button>\n\t\t<span class=\"share-article-copied\" aria-live=\"polite\" aria-atomic=\"true\">\n\t\t\tArtikel-Link kopiert\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\">Seit ihrer Entwicklung im Jahr 1883 war die Kjeldahl-Methode zur Proteinbestimmung weltweit der Standard in Laboren. Erst in den 1990er Jahren begann die Dumas-Methode, Fu\u00df zu fassen. Obwohl die Dumas-Methode technisch gesehen \u00e4lter war als die Kjeldahl-Methode, haben erst die j\u00fcngsten technologischen Entwicklungen sie f\u00fcr Labore leicht zug\u00e4nglich gemacht \u2013 und \u201cleicht zug\u00e4nglich\u201d ist sicherlich eine treffende Beschreibung f\u00fcr die moderne Dumas-Methode zur Bestimmung des Eiwei\u00dfgehalts \u2013 insbesondere so, wie LECO sie umsetzt!<\/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=\"LECO FP828-Proteinbestimmung\" 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\">Die Kjeldahl-Methode war von Anfang an ein m\u00fchsamer und zeitaufw\u00e4ndiger Prozess. Als klassische nasschemische Aufschlussmethode erforderte sie das Vorhandensein eines nasschemischen Labors und eines analytisch geschulten Laboranten sowie starke S\u00e4ure- und Basenreagenzien, die eine Abzugshandhabung und Abfallentsorgung erforderten. Ein einzelner Probenlauf konnte Stunden dauern. Mit der Versch\u00e4rfung der Sicherheitsvorschriften wurden einige der effizientesten Kjeldahl-Katalysatoren ausgemustert, was zu einer geringeren Stickstoffwiederfindung w\u00e4hrend der Aufschlussphase und einer negativen Stickstoffabweichung f\u00fchrte.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Andererseits war die Dumas-Methode eine auf Verbrennung basierende Methode, bei der Sauerstoff verwendet wurde, um den Proteinstickstoff in N umzuwandeln<sub>2<\/sub>\/NEIN<sub>X<\/sub>\u00a0Gas. Das NO<sub>X<\/sub> wird auf N reduziert<sub>2<\/sub>, und der Rest der Verbrennungsgase wird herausgefiltert, so dass nur N \u00fcbrig bleibt<sub>2<\/sub> mit einem W\u00e4rmeleitf\u00e4higkeitssensor (WLD) gemessen zu werden.<\/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 \u2013 Nachrichten \u2013 Kjeldahl vs. Dumas \u2013 Probenkarussell der Serie 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\">Die Proteinanalysatoren von LECO, die <a href=\"https:\/\/www.leco.com\/de\/instrument\/organische-elementaranalysatoren\/\" data-type=\"instrument\" data-id=\"2228\">FP828 und FP928<\/a>, sind darauf ausgelegt, diesen Prozess zu vereinfachen. Im Gegensatz zu \u00e4lteren Dumas-Ger\u00e4ten f\u00fchren diese beiden die Verbrennung in einer reinen Sauerstoffumgebung durch, was bedeutet, dass niemals eine Sauerstoffdosierung oder gar Methoden\u00e4nderungen je nach Art der analysierten Probe erforderlich sind. Die Probenaufgabemethoden und Autosampler sind in der Lage, sowohl fl\u00fcssige als auch feste Proben unter Verwendung von Gel- oder Zinnkapseln oder wiederverwendbaren Keramikschiffchen zu analysieren.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Dank der Effizienz des Ger\u00e4ts und der LECO-Verbrauchsmaterialien, die speziell zur Optimierung seiner Leistungsf\u00e4higkeit entwickelt wurden, ist das FP828 in der Lage, eine einzelne Probe in weniger als drei Minuten zu analysieren. Dies stellt eine enorme Verbesserung gegen\u00fcber den mehreren Stunden dar, die f\u00fcr die Kjeldahl-Methode erforderlich sind, und f\u00fchrt zu einer massiven Steigerung des Durchsatzes. Da pro Durchlauf nur eine begrenzte Menge an Reagenzien und Verbrauchsmaterialien ben\u00f6tigt wird, haben die LECO-Verbrennungsofen die Kosten pro Analyse gesenkt; zudem k\u00f6nnen sie ohne Hardware-\u00c4nderungen so konfiguriert werden, dass sie Argongas anstelle des derzeit teuren Heliums verwenden.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ein LECO FP828 ist so einfach zu bedienen, dass es nicht einmal <em>muss<\/em> eine Laborfachkraft oder ein analytisch geschulter Labormitarbeiter, um erfolgreich zu sein.<\/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\">Mehr erfahren<\/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 bietet hochmoderne Ger\u00e4te zur Proteinanalyse f\u00fcr Laboratorien in den Bereichen Lebensmittel, Futtermittel, Milchprodukte, Getreide und Landwirtschaft an. Auf diesem Bild sind N\u00fcsse, K\u00e4se, Fisch und Brokkoli als Proteinquellen dargestellt.\" 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\tUm mehr \u00fcber diese Proteinbestimmungsger\u00e4te zu erfahren und eine Demonstration des FP828 bei der Analyse sowohl einer festen als auch einer fl\u00fcssigen Probe zu sehen, k\u00f6nnen Sie sich das On-Demand-Webinar ansehen: <a href=\"https:\/\/www.leco.com\/de\/veranstaltungen\/webinar\/kjeldahl-vs-dumas-wie-bestimmt-man-protein\/\" data-type=\"event\" data-id=\"3818\"><em>Kjeldahl vs. Dumas \u2013 Wie bestimmt man Protein?<\/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\/de\/events\/webinar\/kjeldahl-vs-dumas-how-do-you-determine-protein\/\">\n\t\t\t\t\t\t\tF\u00fcr das Webinar registrieren\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\">Verwendete Instrumente<\/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\/de\/instrument\/organische-elementaranalysatoren\/\" 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 Bestimmung von Kohlenstoff, Wasserstoff und Stickstoff\">\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 Bestimmung von Kohlenstoff, Wasserstoff und Stickstoff\" 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\t828\/928 Serie\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\tKohlenstoff-, Wasserstoff-, Stickstoff-, Schwefel- und Proteinanalytik organischer Materialien\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\">Verwandte Nachrichten<\/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\/de\/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\/de\/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 September 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\/de\/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\/de\/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 September 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\/de\/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=\"Die Bedeutung der Analyse des gesamten organischen Kohlenstoffs im Boden in der regenerativen Landwirtschaft\" 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\/de\/news\/role-of-toc-in-regenerative-agriculture\/\" target=\"_self\">Die Bedeutung der Analyse des gesamten organischen Kohlenstoffs im Boden in der regenerativen Landwirtschaft<\/a><\/h3>\n\n<div class=\"wp-block-post-date\"><time datetime=\"2026-08-05T08:16:00-04:00\">5. August 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\/de\/wp-json\/wp\/v2\/posts\/3969","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.leco.com\/de\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.leco.com\/de\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.leco.com\/de\/wp-json\/wp\/v2\/users\/9"}],"replies":[{"embeddable":true,"href":"https:\/\/www.leco.com\/de\/wp-json\/wp\/v2\/comments?post=3969"}],"version-history":[{"count":2,"href":"https:\/\/www.leco.com\/de\/wp-json\/wp\/v2\/posts\/3969\/revisions"}],"predecessor-version":[{"id":7266,"href":"https:\/\/www.leco.com\/de\/wp-json\/wp\/v2\/posts\/3969\/revisions\/7266"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.leco.com\/de\/wp-json\/wp\/v2\/media\/5202"}],"wp:attachment":[{"href":"https:\/\/www.leco.com\/de\/wp-json\/wp\/v2\/media?parent=3969"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.leco.com\/de\/wp-json\/wp\/v2\/categories?post=3969"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.leco.com\/de\/wp-json\/wp\/v2\/tags?post=3969"},{"taxonomy":"instrument-model","embeddable":true,"href":"https:\/\/www.leco.com\/de\/wp-json\/wp\/v2\/instrument-model?post=3969"},{"taxonomy":"core-analysis-type","embeddable":true,"href":"https:\/\/www.leco.com\/de\/wp-json\/wp\/v2\/core-analysis-type?post=3969"},{"taxonomy":"application-type","embeddable":true,"href":"https:\/\/www.leco.com\/de\/wp-json\/wp\/v2\/application-type?post=3969"},{"taxonomy":"product-line","embeddable":true,"href":"https:\/\/www.leco.com\/de\/wp-json\/wp\/v2\/product-line?post=3969"}],"curies":[{"name":"WP","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}