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Representative elution profiles of tea catechins, gallic acid, caffeine, theobromine and theophylline from green tea (a), oolong tea (b), black tea (c) (1 gallic acid, 2 (−)-gallocatechin (GC), 3 theobromine, 4 EGC, 5 (−)-catechin (C), 6 theophylline, 7 EGCG, 8 caffeine, 9 EC, 10 (−)-gallocatechin-3-gallate (GCG), 11 EGCG3″Me, 12 ECG, 13 (−)-catechin gallate (CG))
