Thi Anh Dao Dong, Van Thanh Hoang, Viet Ha Do, Duc Nguyen Vuong
Department of Food Technology Faculty of Chemical Engineering Ho Chi Minh City University of Technology (HCMUT) Ho Chi Minh City Vietnam.
Vietnam National University Ho Chi Minh City Ho Chi Minh City Vietnam.
Food Sci Nutr. 2021 Oct 20;9(12):6566-6574. doi: 10.1002/fsn3.2597. eCollection 2021 Dec.
Tea leaves () have many health benefits due to their abundance of polyphenols with antioxidant activity, most notably epigallocatechin-3-gallate (EGCG). To protect those bioactive compounds, the spray-drying technique of green tea-extracted solution is conducted because of encapsulating. This study aimed to optimize the spray-drying condition using the response surface methodology (RSM) with respect to the maximal polyphenol content of the product. Furthermore, the characterizations of resulting powder were determined. The results showed that optimal spray-drying temperature, input flow rate, and whey protein isolate (WPI) content were evaluated at 136℃, 6.8 rpm, and 10.3% of dry basis, respectively. The obtained green tea powder products, which got from optimal spray-drying process, achieved total polyphenol content (TPC), EGCG, and caffeine content of 322.06 mg GAE/g, 11.4%, and 2.8% of dry basis, respectively. This result revealed the feasibility of green tea leaves to produce tea powder rich in EGCG and polyphenols by spray-drying technique, potentially contributing to the diversification of tea products.
茶叶由于富含具有抗氧化活性的多酚类物质，尤其是表没食子儿茶素-3-没食子酸酯（EGCG），因而具有诸多健康益处。为保护这些生物活性化合物，采用喷雾干燥技术处理绿茶提取液以进行包封。本研究旨在运用响应面法（RSM）优化喷雾干燥条件，以获得产品中最大的多酚含量。此外，还对所得粉末进行了表征。结果表明，最佳喷雾干燥温度、进料流速和乳清蛋白分离物（WPI）含量分别为136℃、6.8转/分钟和干基的10.3%。通过最佳喷雾干燥工艺获得的绿茶粉产品，其总多酚含量（TPC）、EGCG和咖啡因含量分别为322.06毫克没食子酸当量/克、干基的11.4%和2.8%。该结果表明，利用喷雾干燥技术从茶叶中生产富含EGCG和多酚的茶粉是可行的，这可能有助于茶产品的多样化。
