BS ISO 14502-1:2005
Current
The latest, up-to-date edition.
Determination of substances characteristic of green and black tea Content of total polyphenols in tea. Colorimetric method using Folin-Ciocalteu reagent
Hardcopy , PDF
English
31-07-2006
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 |
| 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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