abstract:Thearubigins are polymeric polyphenols that are formed during the enzymatic oxidation and condensation of two gallocatechins (epigallocatechin and epigallocatechin gallate) with the participation of polyphenol oxidases during the fermentation reactions in black tea.Production and HPLC analysis of black tea theaflavins and thearubigins during in vitro oxidation.