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首页> 外文期刊>European journal of clinical nutrition >A single dose of tea with or without milk increases plasma antioxidant activity in humans.
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A single dose of tea with or without milk increases plasma antioxidant activity in humans.

机译：含或不含牛奶的单剂量茶都会增加人的血浆抗氧化活性。

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OBJECTIVE: To investigate the effect of black and green tea consumption, with and without milk, on the plasma antioxidant activity in humans. DESIGN: In a complete cross-over design, 21 healthy volunteers (10 male, 11 female) received a single dose of black tea, green tea (2 g tea solids in 300 ml water) or water with or without milk. Blood samples were obtained at baseline and at several time points up to 2 h post-tea drinking. Plasma was analysed for total catechins and antioxidant activity, using the ferric reducing ability of plasma (FRAP) assay. RESULTS: Consumption of black tea resulted in a significant increase in plasma antioxidant activity reaching maximal levels at about 60 min. A larger increase was observed after consumption of green tea. As anticipated from the higher catechin concentration in green tea, the rise in plasma total catechins was significantly higher after consumption of green tea when compared to black tea. Addition of milk to black or green tea did not affect the observed increases in plasma antioxidant activity. CONCLUSIONS: Consumption of a single dose of black or green tea induces a significant rise in plasma antioxidant activity in vivo. Addition of milk to tea does not abolish this increase. Whether the observed increases in plasma antioxidant activity after a single dose of tea prevent in vivo oxidative damage remains to be established. European Journal of Clinical Nutrition (2000) 54, 87-92
机译：目的：研究食用和不食用牛奶的红茶和绿茶对人血浆抗氧化活性的影响。设计：在完全交叉的设计中，21名健康志愿者（10名男性，11名女性）接受了单剂量的红茶，绿茶（2克茶固体在300毫升水中）或加或不加牛奶的水。在基线和饮茶后2小时的几个时间点采集血样。使用血浆的铁还原能力（FRAP）分析来分析血浆中的儿茶素总量和抗氧化活性。结果：食用红茶导致血浆抗氧化活性显着增加，在约60分钟时达到最高水平。饮用绿茶后观察到更大的增加。如从绿茶中较高的儿茶素浓度所预期的，与红茶相比，饮用绿茶后血浆总儿茶素的升高明显更高。在红茶或绿茶中添加牛奶不会影响血浆抗氧化剂活性的增加。结论：单一剂量的红茶或绿茶的摄入会引起体内血浆抗氧化活性的显着提高。在茶中添加牛奶并不能消除这种增加。单剂量饮茶后观察到的血浆抗氧化剂活性的增加是否可以防止体内氧化损伤尚待确定。欧洲临床营养学杂志（2000）54，87-92

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