英语翻译AbstractTea catechins were extracted from green tea leav

英语翻译
Abstract
Tea catechins were extracted from green tea leaves,and the effect of tannase-aided treatment on their antioxidative activity was then
examined.Their antioxidant capacity was evaluated using assays for DPPH,superoxide anion,trolox-equivalent antioxidant capacity
(TEAC),hydrogen peroxide and metal ion chelation.The results show that tannase-treated green tea has a higher antioxidant capacity
than the untreated analog at a concentration of 200 ppm,with greater superoxide anion,hydrogen peroxide and 2,2-diphenyl-1-picrylhydrazyl
(DPPH) scavenging effects (97%,83% and 62%,respectively).At a concentration of 100 ppm,the tannase-treated green
tea also had significantly higher TEAC antioxidant activity compared to the untreated tea (2.4% vs.1.0%).Furthermore,at 150 ppm
the chelating activity of the treated tea for Fe+2/Cu+2 ions was higher compared to the untreated green tea (42.6/33.5% vs.14.6/
7.6%,respectively).The viability of RAW 264.7 cells incubated with tannase-treated green tea for 144 h was higher compared to analogs
incubated with untreated tea.Our results demonstrate that antioxidant activity in flavonoids varies,and that the presence of galloyl residues
decreases the antioxidant activity of tea catechins.
\2 2007 Elsevier Ltd.All rights reserved.

抽象
儿茶素(又称茶单宁,儿茶酚)是从绿茶中提取出来,而单宁酶辅助治疗的抗氧化活性的影响则审查.其抗氧化能力进行了评估利用DPPH自由基,超氧阴离子,Trolox的当量抗氧化能力检测
（特阿克）,过氧化氢和金属离子螯合.结果表明,单宁酶处理绿茶具有更高的抗氧化能力
未经处理的模拟比在200 ppm的浓度,以更大的超氧阴离子,过氧化氢和2,2 -二苯基- 1 -苦味
（清除DPPH）的清除作用（97％,83％和62％,分别）.在100 ppm时,浓度的单宁酶处理过的绿色
茶叶也有显着较高特阿克抗氧化活性比未经处理的茶（2.4％对1.0％）.此外,在百万分之150
该茶为铁螯合剂治疗活动2 /铜2明显高于未经处理的绿茶（42.6/33.5％比14.6离子/
7.6％,分别）.该可行性的RAW 264.7细胞单宁酶处理对绿茶144 Ĥ培养较高相比类似物
未经处理的培养与茶.我们的研究结果表明,在黄酮类化合物抗氧化活性的变化,而对没食子酰残基的存在
降低了儿茶素的抗氧化活性.
2007年爱思唯尔版权所有.