Milk and milk products. Determination of nitrogen content Kjeldahl principle and crude protein calculation

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

28-02-2014

Publisher

British Standards Institution

Forewords
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents
6 Apparatus
7 Sampling
8 Preparation of test sample
9 Procedures
10 Calculation and expression of results
11 Precision
12 Test report
Annex A (informative) - Test portion
Annex B (informative) - Collaborative trials
Bibliography

Defines 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.

This International Standard 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.

NOTE Inaccurate crude protein results will be obtained if non-milk sources of nitrogen are present in the products specified in this International Standard.

Committee	AW/5
DevelopmentNote	Supersedes 98/12618 DC. (02/2002) Supersedes BS 6248-7(1982), BS EN ISO 8968-2, DD ISO/TS 17837 & 13/30258434 DC. (02/2014)
DocumentType	Standard
Pages	30
PublisherName	British Standards Institution
Status	Current
Supersedes	DD ISO/TS 17837:2008 98/712618 DC : NOV 98 BS EN ISO 8968-1:2002 13/30258434 DC : 0 BS 6248-7:1982 BS EN ISO 8968-2:2002
UnderRevision	DD ISO/TS 17837:2008

Standards	Relationship
NBN EN ISO 8968-1 : 2014	Identical
ISO 8968-1:2014	Identical
UNI EN ISO 8968-1 : 2014	Identical
NEN EN ISO 8968-1 : 2014	Identical
DIN EN ISO 8968-1:2014-06	Identical
UNE-EN ISO 8968-1:2014	Identical
NS EN ISO 8968-1 : 2014	Identical
SN EN ISO 8968-1 : 2014	Identical
I.S. EN ISO 8968-1:2014	Identical
NF EN ISO 8968-1 : 2014	Identical
EN ISO 8968-1:2014	Identical
DIN EN ISO 8968-1:2002-06	Identical

ISO 5725-1:1994	Accuracy (trueness and precision) of measurement methods and results — Part 1: General principles and definitions
ISO 385:2005	Laboratory glassware Burettes
ISO 707:2008	Milk and milk products — Guidance on sampling
ISO 5725-2:1994	Accuracy (trueness and precision) of measurement methods and results Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method
ISO 8655-3:2002	Piston-operated volumetric apparatus Part 3: Piston burettes

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BS EN ISO 8968-1:2014

Milk and milk products. Determination of nitrogen content Kjeldahl principle and crude protein calculation

Table of Contents

Abstract

Scope

General Product Information

International Equivalents

Standards Referencing This Book

Category

Subcategory