Xu Qing, Zhou Yuanjing, Zhao Jingfang, Yao Songlin, Wang Jihong
Institute of Biology Guizhou Academy of Sciences Guiyang City China.
Guizhou Academy of Analysis and Testing Guizhou Academy of Sciences Guiyang City China.
Food Sci Nutr. 2020 Oct 7;8(11):6182-6191. doi: 10.1002/fsn3.1913. eCollection 2020 Nov.
This study investigated the effect of storage time on biochemical characteristics of hawk tea () and explored the correlation between the content of flavonoids and polyphenols and antioxidant activity. The antioxidant activity and the content of inclusions, amino acid, and mineral elements in hawk tea processed by boiling water fixation and packed in airtight polypropylene bags and stored in 0°C refrigerator under different storage time (one year, three years, and six years) were analyzed. Results indicated that the biochemical characteristics of hawk tea changed less within 12 months. The total content and types of amino acids in hawk tea reached the maximum in the third year, as well as the content of total trace elements. The water extracts, tea polyphenol, caffeine, lysine, valine, isoleucine, glycine, proline, Ca, and Zn decreased continuously in the storage period of 6 years, but the total flavonoids, Mg, and Ni changed just the opposite. Total polyphenol is the main antioxidant material in hawk tea. Results of the present study provided useful information for people to systematically understand the changes of tea in the storage process and to reasonably develop hawk tea product.
本研究考察了贮藏时间对老鹰茶生化特性的影响，并探讨了黄酮类和多酚类物质含量与抗氧化活性之间的相关性。分析了经沸水杀青处理后，密封包装于聚丙烯袋中，在0℃冰箱中贮藏不同时间（1年、3年和6年）的老鹰茶的抗氧化活性以及内含物、氨基酸和矿质元素的含量。结果表明，老鹰茶在12个月内生化特性变化较小。老鹰茶中氨基酸的总量和种类在第3年达到最大值，总微量元素含量也是如此。在6年的贮藏期内，水浸出物、茶多酚、咖啡因、赖氨酸、缬氨酸、异亮氨酸、甘氨酸、脯氨酸、钙和锌含量持续下降，但总黄酮、镁和镍的变化情况则相反。总多酚是老鹰茶中的主要抗氧化物质。本研究结果为人们系统了解茶叶贮藏过程中的变化以及合理开发老鹰茶产品提供了有用信息。
