DETERMINATION OF SUBSTANCES CHARACTERISTIC OF GREEN AND BLACK TEA - PART 2: CONTENT OF CATECHINS IN GREEN TEA - METHOD USING HIGH-PERFORMANCE LIQUID CHROMATOGRAPHY

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

01-01-2007

Publisher

German Institute for Standardisation (Deutsches Institut für Normung)

Nationales Vorwort
Nationaler Anhang NA (informativ) Literaturhinweise
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
   9.1 Allgemeines
   9.2 Quantitative Bestimmung mit Catechinstandards
   9.3 Quantitative Bestimmung mit einem Coffeinstandard
        und den Relativen Catechin-Responsfaktoren (RRF)
10 Präzision
   10.1 Ringversuch
   10.2 Wiederholpräzision
   10.3 Vergleichpräzision
11 Prüfbericht
Anhang A (informativ) Ergebnisse des Ringversuches
Anhang B (informativ) Beurteilung der Reinheit der Standards
Anhang C (informativ) Typische HPLC-Chromatogramme
Anhang D (informativ) Der Einfluss von Eisen(III)-Ionen auf
                      Catechin-RRFs
Anhang E (informativ) Quantitativer Vergleich - Verwendung
                      von Catechin-Standards oder
                      eines Coffein-Standards in Verbindung
                      mit Catechin-RRFs
Literaturhinweise

Gives a high-performance liquid chromatographic (HPLC) method for the determination of the total catechin content of tea from the summation of the individual catechins.

DocumentType	Standard
Pages	26
PublisherName	German Institute for Standardisation (Deutsches Institut für Normung)
Status	Current

Standards	Relationship
ISO 14502-2:2005	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 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 14502-2:2007-12

Current

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