BS EN ISO 16634-2:2016

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Food products. Determination of the total nitrogen content by combustion according to the Dumas principle and calculation of the crude protein content – Cereals, pulses and milled cereal products

Published By	Publication Date	Number of Pages
BSI	2016	36

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Description

This part of ISO 16634 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).

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PDF Pages	PDF Title
4	European Foreword
6	Foreword
7	Introduction
9	1 Scope 2 Normative references 3 Terms and definitions
10	4 Principle 5 Reagents
11	6 Apparatus 7 Sampling 8 Preparation of the test sample
12	9 Procedure 9.1 General 9.2 Test portion 9.3 Control of oxygen supply
13	9.4 Calibration 9.5 Determination 9.6 Detection and data processing
14	10 Calculation and expression of results 10.1 Calculation 10.1.1 Nitrogen content 10.1.2 Crude protein content 10.2 Expression of results 11 Precision 11.1 Interlaboratory tests
15	11.2 Repeatability 11.3 Reproducibility 11.4 Critical difference 11.4.1 Comparison of two groups of measurements in the same laboratory
16	11.4.2 Comparison of two groups of measurements in two different laboratories 11.5 Uncertainty 12 Test report
17	Annex A (informative) Flowchart for a basic Dumas apparatus
18	Annex B (informative) Schematic diagrams of suitable types of Dumas apparatus
21	Annex C (informative) Equipment calibration
23	Annex D (informative) Results of interlaboratory tests
30	Bibliography

Additional information

Status	Revision Underway
Pages	36
Publication Date	2016-06-30
ISBN	978 0 580 87691 2
Standard Number	BS EN ISO 16634-2:2016
Title	Food products. Determination of the total nitrogen content by combustion according to the Dumas principle and calculation of the crude protein content – Cereals, pulses and milled cereal products
Identical National Standard Of	ISO 16634-2:2016, EN ISO 16634-2:2016
Replaces	DD CEN ISO/TS 16634-2:2009
Descriptors	Chemical analysis and testing, Cereals, Food crops, Combustion test methods, Cereal flour, Pulses (crops), Determination of content, Test equipment, Proteins, Food products, Cereal products, Nitrogen, Food testing
Publisher	BSI
Committee	AW/4
ICS Codes	67.050 - General methods of tests and analysis for food products

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BS EN ISO 16634-2:2016

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