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Table 1 Composition of tea packets in the crossover tea study

From: A six-month crossover chemoprevention clinical trial of tea in smokers and non-smokers: methodological issues in a feasibility study

Component Green tea Black tea
  (%, g/100 g) (%, g/100 g)
Flavan-3-ols   
 (+)-Gallocatechin 2.5 0.2
 (−)-Epigallocatechin 8.0 0.4
 (+)-Catechin 1.2 0.9
 (−)-Epigallocatechingallate 12.1 0.7
 (−)-Epicatechin 3.0 0.6
 (+)-Gallocatechingallate 1.1 0.2
 (−)-Epicatechingallate 3.9 0.6
 (+)-Catechingallate 0.2 <0.1
Theaflavins   
 Theaflavin - 0.3
 Theaflavin 3-O-gallate - 0.5
 Theaflavin 3’-O-gallate - 0.3
 Theaflavin 3,3’-di-O-gallate - 0.4
Caffeine 5.4 7.1
Gallic acid 0.2 0.9