Safety and anti-hyperglycemic efficacy of various tea types in mice

被引:60
作者
Han, Manman [1 ]
Zhao, Guangshan [1 ]
Wang, Yijun [1 ]
Wang, Dongxu [1 ]
Sun, Feng [1 ]
Ning, Jingming [1 ]
Wan, Xiachun [1 ]
Zhang, Jinsong [1 ]
机构
[1] Anhui Agr Univ, Sch Tea & Food Sci, State Key Lab Tea Plant Biol & Utilizat, Hefei 230036, Anhui, Peoples R China
来源
SCIENTIFIC REPORTS | 2016年 / 6卷
关键词
HIGH-FAT DIET; CHINESE GREEN TEA; ORAL POLYPHENON E; RAI STAGE 0; CARBON-TETRACHLORIDE; INDUCED OBESITY; LIVER-INJURY; OOLONG TEA; BLACK TEA; POLYSACCHARIDES;
D O I
10.1038/srep31703
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Tea, a beverage consumed worldwide, has proven anti-hyperglycemic effects in animal models. Better efficacies of tea beverages are frequently associated with high-dose levels, whose safety attracts considerable attention. Based on the inherent nature of tea catechin oxidation, fresh tea leaves are manufactured into diverse tea types by modulating the oxidation degree of catechins. The present study aimed to assess various tea types for their safety properties and anti-hyperglycemic effects. Mice were allowed free access to tea infusion (1: 30, w/v) for one week, and the rare smoked tea caused salient adverse reactions, including hepatic and gastrointestinal toxicities; meanwhile, the widely-consumed green and black teas, unlike the rare yellow tea, suppressed growth in fast-growing healthy mice. When mice were fed a high-fat diet and allowed free access to tea infusion (1: 30, w/v) for 25 days, only yellow tea significantly reduced blood glucose. Therefore, various teas showed different safety profiles as well as anti-hyperglycemic efficacy strengths. To achieve an effective and safe anti-hyperglycemic outcome, yellow tea, which effectively suppressed high-fat diet-induced early elevation of hepatic thioredoxin-interacting protein, is an optimal choice.
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页数:11
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