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See Chinese contents: GB/T 8313-2018 GB/T 8313-2018: Determination of total polyphenols and catechins content in tea
This standard specifies a method for the determination of catechins in tea, by high-performance liquid chromatography (HPLC), AND the method for the determination of polyphenols in tea, by spectrophotometry. This standard applies to the determination of catechins and polyphenols, in tea and tea products.
