Polyphenol Content of Plasma and Litter after the Oral Administration of Green Tea and Tea Polyphenols in Chickens
2012
Zhou, Yi-Bin | Wan, Xiao-Chun | Shang, Yan-Yan | Hu, Jing-Wei | Shao, Lei | Chen, Wei | Li, Da-Xiang
Metabolic profiles of broiler chickens were examined after the ingestion of green tea, tea polyphenols, and (−)-epigallocatechin-3-gallate (EGCG). Solid-phase extraction of serum and litters yielded free catechins and their metabolites, which were then identified and quantified by liquid chromatography–tandem mass spectrometry. In plasma samples, (−)-gallocatechin, (+)-catechin, and EGCG were detected in the green tea group; pyrogallol acid, (epi)catechin-O-sulfate, 4′-O-methyl-(epi)gallocatechin-O-glucuronide, and (epi)catechin-3′-O-glucuronide were detected in the tea polyphenols group; and EGCG, (−)-gallocatechin gallate (GCG), and 4′-O-methyl-(epi)gallocatechin-O-glucuronides were detected in the EGCG group. In litters, gallic acid, EGCG, GCG, and ECG were detected in the green tea and tea polyphenols groups; EGCG and ECG were detected in the EGCG group. The conjugated metabolites, 4′-O-methyl-(epi)gallocatechin-O-glucuronide, (epi)catechin-3′-glucuronide, and 4′-O-methyl-(epi)catechin-O-sulfate, were identified in the green tea group; 4′-O-methyl-(epi)catechin-O-sulfate and 4′-O-methyl-(epi)gallocatechin-O-sulfate were identified in the tea polyphenols group; only 4′-O-methyl-(epi)gallocatechin-O-sulfate was detected in the EGCG group. The excretion of tea catechins was 95.8, 87.7, and 97.7% for the green tea, tea polyphenols, and EGCG groups, respectively.
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