Determination of substances characteristic of green and black tea Content of total polyphenols in tea. Colorimetric method using Folin-Ciocalteu reagent

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

31-07-2006

Publisher

British Standards Institution

Foreword
1 Scope
2 Normative references
3 Principle
4 Reagents
5 Apparatus
6 Sampling
7 Preparation of test samples
8 Procedure
   8.1 General
   8.2 Determination of dry matter content
   8.3 Test portion
   8.4 Extraction of polyphenols
   8.5 Dilution
   8.6 Determination
9 Calculation
10 Precision
   10.1 Interlaboratory test
   10.2 Repeatability
   10.3 Reproducibility
11 Test report
Annex A (informative) Gallic acid calibration graph
Annex B (informative) Results of interlaboratory test
Bibliography

Describes a method for the determination of the total polyphenol content of leaf tea and instant tea by a colorimetric assay using Folin-Ciocalteu phenol reagent.

Committee	AW/8
DevelopmentNote	Supersedes 03/312776 DC. (04/2005)
DocumentType	Standard
Pages	18
PublisherName	British Standards Institution
Status	Current
Supersedes	03/312776 DC : DRAFT AUG 2003

Standards	Relationship
ISO 14502-1:2005	Identical

ISO 7516:1984	Instant tea in solid form Sampling
ISO 1839:1980	Tea — Sampling
ISO 7513:1990	Instant tea in solid form Determination of moisture content (loss in mass at 103 degrees C)
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 3696:1987	Water for analytical laboratory use — Specification and test methods
ISO 1572:1980	Tea Preparation of ground sample of known dry matter content

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BS ISO 14502-1:2005

Determination of substances characteristic of green and black tea Content of total polyphenols in tea. Colorimetric method using Folin-Ciocalteu reagent

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