NF EN ISO 8968-1

NF EN ISO 8968-1

May 2014
Standard Current

Milk and milk products - Determination of nitrogen content - Part 1 : Kjeldahl principle and crude protein calculation

ISO 8968-1|IDF 20-1:2014 specifies a method for the determination of the nitrogen content and crude protein calculation of milk and milk products by the Kjeldahl principle, using traditional and block digestion methods. The methods are applicable to: liquid cow's (whole, partially skimmed or skimmed milk), goat's and sheep's whole milk; hard, semi-hard and processed cheese; dried milk and dried milk products (including milk-based infant formulae, milk protein concentrate, whey protein concentrate, casein and caseinate). The methods are not applicable to samples containing ammonium caseinate.

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Main informations

Collections

National standards and national normative documents

Publication date

May 2014

Number of pages

28 p.

Reference

NF EN ISO 8968-1

ICS Codes

67.100.10   Milk and processed milk products

Classification index

V04-221-1

Print number

1

International kinship

ISO 8968-1/2014

European kinship

EN ISO 8968-1:2014
Sumary
Milk and milk products - Determination of nitrogen content - Part 1 : Kjeldahl principle and crude protein calculation

ISO 8968-1|IDF 20-1:2014 specifies a method for the determination of the nitrogen content and crude protein calculation of milk and milk products by the Kjeldahl principle, using traditional and block digestion methods. The methods are applicable to: liquid cow's (whole, partially skimmed or skimmed milk), goat's and sheep's whole milk; hard, semi-hard and processed cheese; dried milk and dried milk products (including milk-based infant formulae, milk protein concentrate, whey protein concentrate, casein and caseinate). The methods are not applicable to samples containing ammonium caseinate.

Replaced standards (2)
NF EN ISO 8968-1
May 2002
Standard Cancelled
Milk - Determination of nitrogen content - Part 1 : Kjeldahl method

Le présent document qui constitue la partie 1 de la norme, spécifie une méthode pour la détermination de la teneur en azote du lait liquide, entier ou écrémé, selon le principe de Kjeldahl.

NF EN ISO 8968-2
May 2002
Standard Cancelled
Milk - Determination of nitrogen content - Part 2 : block-digestion method (Macro method)

Le présent document qui constitue la partie 2 de la norme, spécifie une méthode pour la détermination de la teneur en azote du lait liquide, entier ou écrémé, selon le principe de la minéralisation en bloc.

Table of contents
  • Avant-propos
    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
    5
  • 8 Préparation de l'échantillon pour essai
    5
  • 9 Mode opératoire
    6
  • 10 Calcul et expression des résultats
    12
  • 11 Fidélité
    13
  • 12 Rapport d'essai
    15
  • Annexe A (informative) Prise d'essai
    16
  • Annexe B (informative) Essai interlaboratoires
    17
  • Bibliographie
    19
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