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时间:2019-07-04
《红茶_绿茶_乌龙茶活性成分抗氧化性研究》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、622009,Vol.30,No.03食品科学※基础研究红茶、绿茶、乌龙茶活性成分抗氧化性研究陈金娥,丰慧君,张海容*(忻州师范学院生化分析技术研究所,山西 忻州 034000)摘 要:目的与方法:通过醇提得到各种茶多酚提取液,酒石酸亚铁法测定了多酚的含量;水提得到各种茶多糖提取液,用硫酸-苯酚法测定其中多糖的含量。通过DPPH・法、水杨酸法及邻苯三酚法测定不同茶叶中多酚、多糖含量对自由基的清除作用的影响,对比研究八种茶叶的抗氧化能力。结果:不同茶叶中多糖的含量从2.19%增大到2.89% (半发酵乌龙茶>红茶>绿茶),
2、抗氧化能力:红茶>绿茶>乌龙茶(DPPH・法);红茶>绿茶>乌龙茶(水杨酸法);红茶>乌龙茶>绿茶(邻苯三酚法);不同茶叶中多酚的含量从1.71%增大到9.75% (绿茶>半发酵乌龙茶>红茶);结论:茶多糖和多酚是茶叶的主要抗氧化成分。绿茶的抗氧化作用主要来自茶多酚,红茶的抗氧化作用主要来自茶多糖。除乌龙茶多糖提取液外,两种抗氧化成分的抗氧化能力与其含量成量效关系。关键词:茶叶;多糖;多酚;自由基清除率;DPPH・法;水杨酸法;邻苯三酚法Effects of Active Ingredients in Black Tea, Green Te
3、a and Oolong Tea on Antioxidant CapabilityCHEN Jin-e,FENG Hui-jun,ZHANG Hai-rong*(Laboratory of Biochemical Analysis, Xinzhou Teachers University, Xinzhou 034000, China)Abstract :Polysaccharides were extracted from different teas with hot water and their contents were det
4、ermined by sulfuricacid-phenol method, while polyphenols were extracted with alcohol and their contents were determined by ferrous tartratemethod. Then the scavenging effects of tea polysaccharide and polyphenol on free radicals were examined by DPPH・, salicylicacid and py
5、rogallol methods respectively, and the antioxidant capabilities of 8 kinds of tea were comparatively studied. Resultsshowed that the polysaccharides contents in different teas are from 2.19% up to 2.89% and their change order is as following:semifermented oolong tea > blac
6、k tea > green tea. The polyphenol contents in different teas are from 1.71% up to 9.75% andtheir change order is as following: green tea > semifermented oolong tea > black tea. The order of antioxidant capability is blacktea > green tea > semifermented oolong tea (DPPH・ an
7、d salicylic acid methods) or black tea > semifermented oolong tea >green tea (pyrogallol method). Both tea polysaccharides and polyphenols are main antioxidants in different kinds of teas. Theantioxidant capability of green tea mainly depends on polyphenols, while that of
8、black tea mainly depends on polysaccharides.Furthermore, the antioxidant capabilities of
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