紫薯是红薯的一种，食用和药用价值很高，它不仅具有其他红薯中所有的营养成分，并且有含量丰富的硒元素和原花青素，具有很强的保健功能和开发应用价值。而原花青素和其他还原物质相比，其抗氧化和延缓衰老的效果更佳，是一种无毒、无害、具有抗衰老功能的天然色素。本研究旨在以紫薯为主要原料，加入柠檬酸、木糖醇、苯甲酸钠等辅料，经过单因素试验筛选配方和优化制备工艺，研制成了具有抗氧化保健功效的复合功能性饮料。结果表明：该饮料最佳配方为200 mL饮料中含紫甘薯提取物5.0 g、苯甲酸钠3.5 mg、木糖醇6.0 g、柠檬酸0.20 g。且测得原花青素的含量2.2 mg/mL。本饮料口感良好，酸甜适中，目前在饮料研究中以原花青素为原料的较少，所以该饮料具有很好的市场前景。

Purple sweet potato is a kind of sweet potato, with high edible and medicinal value. It not only has all the nutrients of the other sweet potato, but also has abundant selenium and proanthocyanidins, so possessing a strong health care function and the development and application of value. Compared proanthocyanidins with other reducing substances, its function of antioxidant and anti-aging are better. It is a non-toxic, harmless, natural pigment with anti-aging functions. This study was designed to use the purple sweet potato as the main raw material, with citric acid, xylitol, sodium benzoate, and other accessories, after selection formula based on single-factor tests, and preparation technology was optimized, eventually, compound function drink that is of good antioxidant health care is developed. The results showed that the optimum formula was that 5.0 g of purple sweet potato extract, 6.0 g of xylitol, citric acid 0.20 g and 3.5 mg sodium benzoate in 200 mL beverage. Proanthocyanidins in this drink was 2.2 mg/mL. The drinks taste good, and had a moderate acidity and sweet. The study had good prospects for development.

浙江省中医药科学研究基金计划（2012ZA026）；浙江省教育厅科研项目（Y201016348）；浙江中医药大学学生发展性资助项目（2012018、2012019、2012020）