NF EN ISO 16634-1

December 2008

Standard Current

Food products - Determination of the total nitrogen content by combustion according to the Dumas principle and calculation of the crude protein content - Part 1 : oilseeds and animal feeding stuffs

ISO 16634-1:2008 specifies a method for the determination of the total nitrogen content and the calculation of crude protein content of oilseeds and animal feeding stuffs.This method, like the Kjeldahl method, does not distinguish between protein nitrogen and non-protein nitrogen. For the calculation of protein content, various conversion factors are used.This method is not applicable to milk and milk products.

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Main informations

Collections

National standards and national normative documents

Publication date

December 2008

Number of pages

39 p.

Reference

NF EN ISO 16634-1

ICS Codes

65.120 Animal feeding stuffs

67.050 General methods of tests and analysis for food products

67.200.20 Oilseeds

Classification index

V03-767-1

Print number

1 - 18/12/2008

International kinship

ISO 16634-1:2008

European kinship

EN ISO 16634-1:2008

Sumary

Food products - Determination of the total nitrogen content by combustion according to the Dumas principle and calculation of the crude protein content - Part 1 : oilseeds and animal feeding stuffs

ISO 16634-1:2008 specifies a method for the determination of the total nitrogen content and the calculation of crude protein content of oilseeds and animal feeding stuffs.

This method, like the Kjeldahl method, does not distinguish between protein nitrogen and non-protein nitrogen. For the calculation of protein content, various conversion factors are used.

This method is not applicable to milk and milk products.

Table of contents

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 la demande d'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
12 Rapport d'essai
8
Annexe A (informative) Organigramme élémentaire pour la conception d'un appareil de Dumas
9
Annexe B (informative) Schémas de types d'appareils de Dumas appropriés
10
Annexe C (informative) Étalonnage du matériel
13
Annexe D (informative) Exemples de facteurs de conversion pour obtenir la teneur en protéines à partir de la teneur en azote
15
Annexe E (informative) Résultat des essais interlaboratoires
16
Annexe F (informative) Rapport entre l'azote Dumas et l'azote Kjeldahl
25
Bibliographie
29

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