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BS EN ISO 21187:2021

BS EN ISO 21187:2021

$142.49

Milk. Quantitative determination of microbiological quality. Guidance for establishing and verifying a conversion relationship between results of an alternative method and anchor method results

Published By Publication Date Number of Pages
BSI 2021 30
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This document gives guidelines for the establishment of a conversion relationship between the results of an alternative method and an anchor method, and its verification for the quantitative determination of the microbiological quality of milk.

NOTE

The conversion relationship can be used a) to convert results from an alternative method to the anchor basis or b) to convert results/limits, expressed on an anchor basis, to results in units of an alternative method.

PDF Catalog

PDF Pages PDF Title
2 undefined
4 European foreword
Endorsement notice
7 Foreword
9 Introduction
10 1 Scope
2 Normative references
3 Terms and definitions
11 4 Principles
4.1 General
4.2 Guidance for applied methods and laboratories
12 4.3 Organizational set-up
5 Consideration of factors influencing the conversion relationship
5.1 General
5.2 Environmental factors
5.2.1 General
13 5.2.2 Animal species
5.2.3 Bulk milk storage conditions
5.2.4 Seasonal variations
5.2.5 Sampling and pre-treatment of the test samples
5.2.6 Test sample preservation
5.2.7 Milk production conditions
14 5.3 Analytical factors
5.3.1 Instrument make and model
5.3.2 Chemicals
5.3.3 High somatic cell counts
6 Test samples
6.1 Calculation of number of test samples
15 6.2 Range of test samples
6.3 Representativeness of samples
6.4 Pre-treatment of test samples
6.4.1 General
6.4.2 Preparation of sub-samples
16 6.4.3 Storage and transport of sub-samples
7 Analysis
8 Establishing a conversion relationship
8.1 General
8.2 Validity of results
17 8.3 Conversion relationship
8.4 Calculations
8.4.1 General
8.4.2 Removal of outliers
8.4.3 Conversion relationship
18 9 Verification of a conversion relationship
9.1 Frequency of verification
9.2 Calculation
10 Test report
20 Annex A (informative) Number of test samples for linear regression
23 Annex B (informative) Example identification of outliers and calculation of conversion relationship
24 Annex C (informative) Example ā€” Calculation of significance (verification of conversion relationship)
28 Bibliography

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BS EN ISO 21187:2021
$142.49