绿茶与4种乔木型别样茶抗氧化活性比较研究

Comparative Studies on Antioxidant Activities of Green Tea and Four Tree-type Non-Camellia Teas

目的:比较绿茶与4种乔木型别样茶的抗氧化活性。方法:通过清除二苯代苦味酰基(DPPH)法、铁离子还原测定(FRAP)法、亚铁离子螯合(FIC)法、β胡萝卜素-亚油酸4种体外抗氧化活性测定方法,综合考察绿茶和老鹰茶、大叶苦丁茶、石崖茶、青钱柳茶4种乔木型别样茶水提物的抗氧化活性,同时用Folin-Ciocalteus法测定4种别样茶的总多酚含量。结果:石崖茶具有卓越的抗氧化能力,其螯合亚铁离子能力和还原铁离子能力均优于绿茶;老鹰茶、大叶苦丁茶具有良好的抗氧化活性,大叶苦丁茶还原铁离子能力优于绿茶,老鹰茶和大叶苦丁茶清除自由基(DPPH)能力比绿茶稍低,但高于人工合成抗氧化剂二丁基羟基甲苯(BHT);青钱柳茶抗氧化活性最低。结论:石崖茶、老鹰茶、大叶苦丁茶均具有较高的开发利用价值,值得深入研究和大力推广。

This article was aimed to compare the antioxidant activities of Green tea and four tree-type non-Camellia teas. The antioxidant activities of the water extract of Green tea, Eagle tea, Large-leaved Kuding tea, Shiya tea and Qingqianliu tea were evaluated with four different in vitro assays including 1,1-diphenyl-2-picryl-hydrazyl （DPPH）, ferric-reducing antioxidant power （FRAP）, ferrous ion-chelating （FIC） and β-carotene-linoleate bleaching assay. In addition, the polyphenol contents of different teas were estimated by the Folin-Ciocalteu assay. The results showed that Shiya tea had strong antioxidant activity; its FIC and FRAP abilities are better compared with Green tea. The Eagle tea and Large-leaved Kuding tea have better antioxidant activity. The FRAP activity of Large-leaved Kuding tea was better than green tea. The DPPH of Eagle tea and Large-leaved Kuding tea were slightly lower than Green tea, but higher than the butylated hydroxytoluene （BHT）. The antioxidant ability of Qingqianliu tea was the lowest. It was concluded that Shiya tea, Eagle tea, Large-leaved Kuding tea had relatively high development value which re-quires in-depth research and promotion.