滁州绿茶儿茶素组成及其抗氧化活性
Catechin composition and antioxidant capacity of green teas in Chuzhou
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摘要: 采用超高液相色谱（Ultra high performance liquid chromatography,UPLC）分析了7种滁州绿茶的儿茶素组成,并采用总抗氧化能力法（Total antioxidant capacity assay,TEAC）评价了7种绿茶的抗氧化能力。结果表明,7种滁州绿茶的儿茶素含量均较丰富,其中阳春白雪一级儿茶素含量最高,为78.93 mg/g。7种绿茶的表没食子儿茶素没食子酸酯（（-）-epigallocatechin gallate,EGCG）含量在24.2833.89 mg/g之间,是含量最丰富的儿茶素单体。除此之外,滁州绿茶中没食子儿茶素（（-）-Gallocatechin,GC）、表没食子儿茶素（（-）-Epigallocatechin,EGC）和表儿茶素没食子酸酯（（-）-Epicatechin gallate,ECG）的含量也较高。抗氧化活性实验证明,总儿茶素、EGCG和ECG的含量与滁州绿茶抗氧化能力具有显著的相关性。Abstract: UPLC was applied to analyze the catechin composition in seven varieties of green teas,and their antioxidant capacity was further evaluated by TEAC assay. Results showed that green teas in Chuzhou were rich in catechin and Yang Chun Bai Xue first level tea possessed the highest content of catechin,which was78.93 mg/g. The content of EGCG of green teas ranged from 24.28 to 33.89 mg/g and it was the most abundant catechin monomer in Chuzhou green teas. In addition,Chuzhou green teas also exhibited high levels of GC,EGC and ECG. Furthermore,the content of total catechin,EGCG,and ECG revealed high significant correlation with antioxidant activity of green teas.
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