“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.”