Determination of theanine in tea and instant tea in solid form using high-performance liquid chromatography

Available format(s)

Hardcopy , PDF , PDF 3 Users , PDF 5 Users , PDF 9 Users

Language(s)

English

Published date

01-10-2017

Publisher

International Organization for Standardization

ISO 19563:2016 specifies a high-performance liquid chromatographic (HPLC) method for the determination of theanine content in tea (Camellia sinensis). It is applicable to both tea and instant tea samples. Separation of L- and D-theanine is not possible using this method; however, the L-enantiomer is the major form in tea.

DevelopmentNote	Supersedes ISO/DIS 19563. (01/2017)
DocumentType	Standard
Pages	13
PublisherName	International Organization for Standardization
Status	Current

Standards	Relationship
BS ISO 19563:2017	Identical
NEN ISO 19563 : 2017	Identical

ISO 1573:1980	Tea Determination of loss in mass at 103 degrees C
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