XP CEN ISO/TS 16634-2

September 2010

Standard Cancelled

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.

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Main informations

Collections

National standards and national normative documents

Publication date

September 2010

Number of pages

34 p.

Reference

XP CEN ISO/TS 16634-2

ICS Codes

67.050 General methods of tests and analysis for food products

67.060 Cereals, pulses and derived products

Classification index

V03-767-2

Print number

1 - 24/09/2010

International kinship

ISO/TS 16634-2:2009

European kinship

CEN ISO/TS 16634-2:2009

Sumary

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.

Standard replaced by (1)

NF EN ISO 16634-2

July 2016

Standard Current

<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>

Table of contents

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Avant-propos
iv
Introduction
v
1 Domaine d'application
1
2 Références normatives
1
3 Termes et définitions
1
4 Principe
2
5 Réactifs
2
6 Appareillage
3
7 Échantillonnage
4
8 Préparation de l'échantillon pour essai
4
9 Mode opératoire
4
9.1 Généralités
4
9.2 Prise d'essai
5
9.3 Contrôle de l'alimentation en oxygène
5
9.4 Étalonnage
5
9.5 Détermination
5
9.6 Détection et intégration
6
10 Calcul et expression des résultats
6
10.1 Calcul
6
10.2 Expression des résultats
7
11 Fidélité
7
11.1 Essais interlaboratoires
7
11.2 Répétabilité
7
11.3 Reproductibilité
7
11.4 Différence critique
8
11.5 Incertitude
8
12 Rapport d'essai
9
Annexe A (informative) Organigramme pour un appareil de Dumas de base
10
Annexe B (informative) Schémas de types d'appareils de Dumas appropriés
11
Annexe C (informative) Étalonnage du matériel
14
Annexe D (informative) Exemples de facteurs de conversion pour obtenir la teneur en protéines à partir de la teneur en azote
16
Annexe E (informative) Résultats des essais interlaboratoires
17
Bibliographie
24

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