“The migration order of (+)‐catechin (C), (−)‐epicatechin EC ), (−)‐epigallocatechin (EGC), (−)‐gallocatechin (GC), (−)‐epigallocatechin gallate (EGCG), (−)‐epicatechin gallate (ECG), caffeine and theophylline was significantly affected by the alcohol used as cosurfactant.”