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Drejtoria e Përgjithshme e Standardizimit

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ISO/PWI 19563

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

General information

Current stage: 00.00 Effective date: Dec 5, 2022

Originator: ISO

Owner: ISO/TC 34/SC 8

Type: International Standard

Scope

ISO 19563 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.

Life cycle

PREVIOUSLY

PUBLISHED
ISO 19563:2017

NOW

IN_DEVELOPMENT
ISO/PWI 19563
00.00 Proposal for new project received
Dec 5, 2022