期刊论文

中文

现代食品科技

1673-9078

2020

36

8

48-55 and 264

10.13982/j.mfst.1673-9078.2020.8.0085

国家自然科学基金(31600560) 省农村科技领域项目(2017A020208020) 国家茶叶产业技术体系项目(CARS1909B)。

本校为第一机构

以不同贮藏年份康砖茶为试验材料,检测其儿茶素、没食子酸和茶色素含量,测定其多酚提取物还原铁离子的能力、清除DPPH和ABTS自由基的能力,比较其抗氧化活性.结果 表明:随着贮藏年份的增加,康砖茶总黄酮、茶褐素和没食子酸含量呈显著增加的趋势(p＜0.05).多酚提取物FRAP·EC50(8.28 μg/mL～14.55 μg/mL)显著高于DPPH.EC50(4.26 μg/mL～4.99 μg/mL)和ABTSEC50(5.14 μg/mL～5.50 μg/mL),且DPPH EC50显著低于ABTS EC50 (p＜0.05).随着贮藏年份的增加,DPPH EC50显著降低;FRAP EC50先显著增加,后显著降低(p＜0.05).贮藏期6年(YA2010) ABTS EC50显著低于其他年份(p＜0.05).贮藏时间为15年(YA2001...

Five aged Kang brick teas were used as analytical materials to comparatively analyze its tea polyphenols, catechins and tea pigments. EC50 analysis of antioxidant activities were determined of FRAP, DPPH• and ABTS•. The results showed that contents of the components increased significantly (p<0.05), including catechins, gallic acid, theabrownin and flavonoids during storage period. The median effect concentration (EC50) of FRAP reached from eight point twenty-eight μg/mL to fourteen point fifty-five μg/mL, which were higher than that of ...