Table 6.

Quantification of the Major Groups of Flavan-3-ol Metabolites Excreted in Urine 0–24 h After the Ingestion of 500 ml of Green Tea by Volunteers

Flavan-3-ol metabolites (number of isomers)	0–24 h excretion (μmol)
(Epi)gallocatechin-O-glucuronide (1)	6.5±1.2
4′-O-Methyl-(epi)gallocatechin-O-glucuronide (1)	4.4±1.5
4′-O-Methyl-(epi)gallocatechin-O-sulfates (2)	19.8±0.3
(Epi)gallocatechin-O-sulfates (3)	2.6±3.0
Total (epi)gallocatechin metabolites	33.3 (11.4%)
(Epi)catechin-O-glucuronide (1)	1.5±0.3
(Epi)catechin-O-sulfates (2)	6.7±0.7
O-Methyl-(epi)catechin-O-sulfates (5)	10.9±1.2
Total (epi)catechin metabolites	19.1 (28.5%)
Total flavan-3-ol metabolites	52.4 (8.1%)

Data expressed as mean value±standard error (n=10). Italicized figures in parentheses indicate the amount excreted as a percentage of intake.

Adapted from Stalmach et al. (440).