XP CEN ISO/TS 16634-2
Food products - Determination of the total nitrogen content by combustion according to the Dumas principle and calculation of the crude protein content - Part 2 : cereals, pulses and milled cereal products
ISO/TS 16634-2:2009 specifies a method for the determination of the total nitrogen content and the calculation of the crude protein content of cereals, pulses and milled cereal products. This method, like the Kjeldahl method, does not distinguish between protein nitrogen and non-protein nitrogen. For the calculation of the protein content, various conversion factors, given in the document, are used.
ISO/TS 16634-2:2009 specifies a method for the determination of the total nitrogen content and the calculation of the crude protein content of cereals, pulses and milled cereal products.
This method, like the Kjeldahl method, does not distinguish between protein nitrogen and non-protein nitrogen. For the calculation of the protein content, various conversion factors, given in the document, are used.
<p>ISO 16634-2:2016 specifies a method for the determination of the total nitrogen content and the calculation of the crude protein content of cereals, pulses and milled cereal products.</p> <p>This method, like the Kjeldahl method (see References [1] and [6]), does not distinguish between protein nitrogen and non-protein nitrogen. For the calculation of the protein content, various conversion factors are used (see 3.2).</p>
- Avant-proposiv
- Introductionv
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1 Domaine d'application1
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2 Références normatives1
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3 Termes et définitions1
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4 Principe2
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5 Réactifs2
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6 Appareillage3
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7 Échantillonnage4
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8 Préparation de l'échantillon pour essai4
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9 Mode opératoire4
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9.1 Généralités4
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9.2 Prise d'essai5
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9.3 Contrôle de l'alimentation en oxygène5
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9.4 Étalonnage5
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9.5 Détermination5
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9.6 Détection et intégration6
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10 Calcul et expression des résultats6
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10.1 Calcul6
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10.2 Expression des résultats7
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11 Fidélité7
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11.1 Essais interlaboratoires7
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11.2 Répétabilité7
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11.3 Reproductibilité7
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11.4 Différence critique8
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11.5 Incertitude8
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12 Rapport d'essai9
- Annexe A (informative) Organigramme pour un appareil de Dumas de base10
- Annexe B (informative) Schémas de types d'appareils de Dumas appropriés11
- Annexe C (informative) Étalonnage du matériel14
- Annexe D (informative) Exemples de facteurs de conversion pour obtenir la teneur en protéines à partir de la teneur en azote16
- Annexe E (informative) Résultats des essais interlaboratoires17
- Bibliographie24
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