Selected m/z were 169.02 m/z for gallic acid (GA), 194.08 m/z for caffeine (CAF), 289.07 m/z for (+)-catechin (C) and (−)-epicatechin (EC), 305.07 m/z for (−)- gallocatechin (GC) and (−)-epigallocatechin (EGC), 441.08 m/z for (−)-epicatechin gallate (ECG) and (−)-catechin gallate (CG), and finally 457.08 m/z for (−)-epigallocatechin gallate (EGCG) and (−)-gallocatechin gallate (GCG).