NF EN ISO 20483

NF EN ISO 20483

January 2007
Standard Cancelled

Cereals and pulses - Determination of the nitrogen content and calculation of the crude protein content - Kjeldahl method

ISO 20483:2006 specifies a method for the determination of the nitrogen content of cereals, pulses and derived products, according to the Kjeldahl method, and a method for calculating the crude protein content.The method does not distinguish between protein nitrogen and non-protein nitrogen. If it is important to determine the non-protein nitrogen content, an appropriate method can be applied.

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Main informations

Collections

National standards and national normative documents

Publication date

January 2007

Number of pages

19 p.

Reference

NF EN ISO 20483

ICS Codes

67.060   Cereals, pulses and derived products

Classification index

V03-750

Print number

1 - 26/12/2006

International kinship

ISO 20483:2006

European kinship

EN ISO 20483:2006
Sumary
Cereals and pulses - Determination of the nitrogen content and calculation of the crude protein content - Kjeldahl method

ISO 20483:2006 specifies a method for the determination of the nitrogen content of cereals, pulses and derived products, according to the Kjeldahl method, and a method for calculating the crude protein content.

The method does not distinguish between protein nitrogen and non-protein nitrogen. If it is important to determine the non-protein nitrogen content, an appropriate method can be applied.

Replaced standards (1)
NF V03-750
April 1999
Standard Cancelled
Cereals and pulses. Determination of the nitrogen content and calculation of the raw protein content. Kjeldahl method.

Le présent document spécifie une méthode pour la détermination de la teneur en azote des céréales, légumineuses et dérivés, selon la méthode de Kjeldahl, et une méthode de calcul de la teneur en protéines brutes. La méthode ne fait pas la distinction entre azote protéique et azote non protéique.

Standard replaced by (1)
NF EN ISO 20483
January 2014
Standard Current
Cereals and pulses - Determination of the nitrogen content and calculation of the crude protein content - Kjeldahl method

ISO 20483:2013 specifies a method for the determination of the nitrogen content of cereals, pulses and derived products, according to the Kjeldahl method, and a method for calculating the crude protein content. The method does not distinguish between protein nitrogen and non-protein nitrogen.

Table of contents
  • Avant-propos
    iv
  • 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
    3
  • 8 Préparation de l'échantillon pour essai
    3
  • 9 Détermination de la teneur en eau
    4
  • 10 Mode opératoire
    4
  • 10.1 Généralités
    4
  • 10.2 Prise d'essai
    4
  • 10.3 Détermination
    4
  • 10.4 Essai à blanc
    5
  • 10.5 Essai avec matériau de référence (Essai de contrôle)
    5
  • 11 Expression des résultats
    5
  • 11.1 Teneur en azote
    5
  • 11.2 Teneur en protéines brutes
    6
  • 12 Fidélité
    6
  • 12.1 Essai interlaboratoires
    6
  • 12.2 Répétabilité
    6
  • 12.3 Reproductibilité
    6
  • 12.4 Différence critique
    7
  • 13 Rapport d'essai
    7
  • Annexe A (informative) Résultats des essais interlaboratoires
    8
  • Annexe B (informative) Différence critique et application pratique des limites de répétabilité et de reproductibilité à différentes teneurs en protéines
    10
  • Annexe C (informative) Facteurs permettant de convertir une teneur en azote en teneur en protéines
    12
  • Bibliographie
    13
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