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Determination of substances characteristic of green and black tea. Content of catechins in green tea. Method…

Determination of substances characteristic of green and black tea. Content of total polyphenols in tea. Color…

Determination of substances characteristic of green and black tea — Part 1: Content of total polyphenols in t…

Overview ISO 14502-1:2005 defines a validated colorimetric method using Folin‑Ciocalteu reagent for the determination of the total polyphenol content in green and black teas, including leaf teas and…

Determination of substances characteristic of green and black tea — Part 2: Content of catechins in green tea…

Overview ISO 14502-2:2005 specifies a validated high-performance liquid chromatography (HPLC) method for determining the total catechin content in tea by summing individual catechins. The method is d…