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.
Status: PublishedPublication date: 2017-01
Edition: 1Number of pages: 13
Technical Committee: ISO/TC 34/SC 8 Tea
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