SPC was calculated by summing up the content of all tested phenolic derivatives: protocatechic acid, chlorogenic acid, caffeic acid, ferulic acid, caftaric acid, catechin, epigallocatechin, epicatechin gallate, epicatechin, isoquercetin, quercetin, avicularin, trifolin and apigenin. Results were expressed as mg × 100 g -1 DW.