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BS ISO 19563:2017

BS ISO 19563:2017

$142.49

Determination of theanine in tea and instant tea in solid form using high-performance liquid chromatography

Published By Publication Date Number of Pages
BSI 2017 24
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PDF Catalog

PDF Pages PDF Title
6 Foreword
7 Introduction
9 1 Scope
2 Normative references
3 Terms and definitions
4 Principle
10 5 Reagents
11 6 Apparatus
7 Sampling
8 Preparation of test samples
9 Procedure
9.1 General
12 9.2 Determination of dry matter content
9.3 Test portion
9.3.1 Sample preparations
9.3.2 Sample clean-up (using a polyamide column) — Optional
13 9.4 Determination
9.4.1 Adjustment of the apparatus
9.4.2 HPLC analysis
9.4.3 Identification
14 10 Calculation
11 Precision
11.1 Interlaboratory test
11.2 Repeatability
11.3 Reproducibility
15 12 Test report
16 Annex A (informative) Typical theanine calibration graph
17 Annex B (informative) Typical chromatograms
20 Annex C (informative) Results of interlaboratory tests
21 Bibliography

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BS ISO 19563:2017
$142.49