速饮茶饮料的多酚组成、抗氧化特性及摄入量评估

Polyphenolic profiles,antioxidant capacity and daily polyphenolic intake evaluation of ready-to-drink teas

评价了我国市场最常见速饮(ready-to-drink,RTD)茶饮料的理化性质,分析了其多酚组成和抗氧化能力,并评估了膳食多酚的每日摄入量。结果表明,由于可溶性固形物、pH和颜色参数偏低,所有样品均呈弱酸性和黄色。同时,虽然不同的茶饮料包含不同浓度的总糖,但含有大量维生素C和总多酚,因此具有良好的抗氧化特性。HPLC结果显示,这些茶饮料中主要包含5种儿茶素,分别为表没食子儿茶素、没食子儿茶素、表没食子儿茶素没食子酸酯、表儿茶素、没食子儿茶素没食子酸酯。基于2010~2012年中国居民营养和健康监测数据,RTD茶对中国成年人(>18岁)的多酚摄入量日均贡献估计为33.07 mg/人。

This study evaluated the physicochemical properties of the most common ready-to-drink(RTD)tea beverages in China,and analyzed their polyphenolic profiles and antioxidant capacities.Also,it assessed the daily intake of dietary polyphenols.Results showed that due to the low total soluble solid content,pH and characteristic color parameters,all samples were slightly acidic and showed a slight yellow color.Although different tea beverages contained different concentrations of total sugar,they contained relatively high vitamin C and total phenolics content.Therefore,these beverages showed good antioxidant capacity.HPLC analysis results indicated that these beverages contained five catechins and caffeine,namely,epigallocatechin,gallocatechin,gallocatechin gallate,epicatechin,and epicatechin gallate.In addition,according to the monitoring data from the nutrition and health of Chinese residents during 2010—2012,the average daily polyphenolic intake from RTD teas was estimated to be 33.07 mg/person for Chinese adults.