DETERMINATION OF SUBSTANCES CHARACTERISTIC OF GREEN AND BLACK TEA - PART 1: CONTENT OF TOTAL POLYPHENOLS IN TEA - COLORIMETRIC METHOD USING FOLIN-CIOCALTEU REAGENT

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Hardcopy , PDF

Language(s)

English

Published date

01-01-2007

Publisher

German Institute for Standardisation (Deutsches Institut für Normung)

Nationales Vorwort
1 Anwendungsbereich
2 Normative Verweisungen
3 Kurzbeschreibung
4 Reagenzien
5 Geräte
6 Probenahme
7 Vorbereitung der Untersuchungsproben
8 Durchführung
   8.1 Allgemeines
   8.2 Bestimmung des Trockenmassegehaltes
   8.3 Einwaage
   8.4 Extraktion der Polyphenole
   8.5 Verdünnung
   8.6 Bestimmung
9 Berechnung
10 Präzision
   10.1 Ringversuch
   10.2 Wiederholpräzision
   10.3 Vergleichpräzision
11 Prüfbericht
Anhang A (informativ) Gallussäure-Kalibriergerade
Anhang B (informativ) Ergebnisse des Ringversuches
Literaturhinweise

Defines 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.

DocumentType	Standard
Pages	13
PublisherName	German Institute for Standardisation (Deutsches Institut für Normung)
Status	Current

Standards	Relationship
ISO 14502-1:2005	Identical

DIN ISO 5725-2:2002-12	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 5725-2:1994 including Technical Corrigendum 1:2002)
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
DIN ISO 3696:1991-06	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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DIN ISO 14502-1:2007-11

DETERMINATION OF SUBSTANCES CHARACTERISTIC OF GREEN AND BLACK TEA - PART 1: CONTENT OF TOTAL POLYPHENOLS IN TEA - COLORIMETRIC METHOD USING FOLIN-CIOCALTEU REAGENT

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