DIN ISO 14502-1:2007-11
Current
The latest, up-to-date edition.
DETERMINATION OF SUBSTANCES CHARACTERISTIC OF GREEN AND BLACK TEA - PART 1: CONTENT OF TOTAL POLYPHENOLS IN TEA - COLORIMETRIC METHOD USING FOLIN-CIOCALTEU REAGENT
Hardcopy , PDF
English
01-01-2007
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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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