Figure 8. (a) Relative free radical scavenging potential of catechin (CAT), epicatechin (ECAT), catechin-bovine serum albumin (CAT-BSA) and epicatechin-bovine serum albumin (ECAT-BSA) by 2,2-Diphenyl-1-picrylhydrazyl (DPPH) assay. Upon encapsulation, the antioxidant activity of CAT and ECAT was slightly reduced in comparisons to pure CAT and ECAT. Active hydroxyl groups on CAT and ECAT quenched the free radical of DDPH turning its deep violet color to pale yellow. (b) the antioxidant mechanism of CAT/ECAT.