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CEN
EN ISO 16634-2:2016

EN ISO 16634-2:2016

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Current

The latest, up-to-date edition.

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 16634-2:2016)

Published date

15-06-2016

Publisher

Comite Europeen de Normalisation

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European Foreword
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents
6 Apparatus
7 Sampling
8 Preparation of the test sample
9 Procedure
10 Calculation and expression of results
11 Precision
12 Test report
Annex A (informative) - Flowchart for a basic Dumas
        apparatus
Annex B (informative) - Schematic diagrams of suitable
        types of Dumas apparatus
Annex C (informative) - Equipment calibration
Annex D (informative) - Results of interlaboratory tests
Bibliography

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.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).

Committee
CEN/TC 338
DevelopmentNote
Supersedes CEN ISO/TS 16634-2. (06/2016)
DocumentType
Standard
PublisherName
Comite Europeen de Normalisation
Status
Current
Supersedes

ISO 5725-1:1994 Accuracy (trueness and precision) of measurement methods and results — Part 1: General principles and definitions
ISO 1871:2009 Food and feed products General guidelines for the determination of nitrogen by the Kjeldahl method
ISO 20483:2013 Cereals and pulses — Determination of the nitrogen content and calculation of the crude protein content — Kjeldahl method
ISO 712:2009 Cereals and cereal products — Determination of moisture content — Reference method
ISO 5725-6:1994 Accuracy (trueness and precision) of measurement methods and results — Part 6: Use in practice of accuracy values
ISO 14891:2002 Milk and milk products — Determination of nitrogen content — Routine method using combustion according to the Dumas principle
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 6540:1980 Maize Determination of moisture content (on milled grains and on whole grains)
ISO 24333:2009 Cereals and cereal products — Sampling
ISO 24557:2009 Pulses Determination of moisture content Air-oven method

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