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ISO DIS 19563
M00019847
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ISO DIS 19563 2016 Edition, February 8, 2016 DETERMINATION OF THEANINE IN TEA AND INSTANT TEA IN SOLID FROM USING HIGH-PERFORMANCE LIQUID CHROMATOGRAPHY
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Description / Abstract: This 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.