山西老陈醋多酚提取物抗氧化活性研究

采用不同体系研究山西老陈醋多酚提取物的体外抗氧化活性,并与没食子酸和抗坏血酸做比较。结果显示:老陈醋多酚提取物具有抗氧化功能,并且存在一定的效量关系,但在不同的体外抗氧化体系中活性有所差异。还原能力以及对羟自由基(.OH)的清除能力强弱顺序均为老陈醋多酚提取物>没食子酸>抗坏血酸;清除超氧阴离子自由基(O-2.)能力顺序为老陈醋多酚提取物>抗坏血酸>没食子酸;清除1,1-二苯基-2-三硝基苯肼自由基(DPPH自由基)能力顺序为没食子酸>老陈醋多酚提取物>抗坏血酸;老陈醋多酚提取物清除亚硝酸盐的能力低于抗坏血酸;总抗氧化能力(同质量浓度比较时)的顺序为没食子酸>抗坏血酸>老陈醋多酚提取物。

Antioxidant Activity of Polyphenolic Extract from Shanxi Aged Vinegar

The in vitro antioxidant activity of polyphenolic extract from Shanxi aged vinegar was investigated using different antioxidant evaluation systems and compared with that of gallic acid and vitamin C.The results showed that the polyphenolic extract possessed antioxidant activity in a dosage-dependent manner which varied with the type of model systems.The reducing power and hydroxyl free radical scavenging activity of the samples under investigation were found to decrease in the following order: the polyphenolic extract > gallic acid > vitamin C.The decreasing order of superoxide anion radical scavenging activity among the samples was the polyphenolic extract > vitamin C >gallic acid.The DPPH radial scavenging activity was in the decreasing order of gallic acid > the polyphenolic extract > vitamin C.The nitrite scavenging activity of the extract was poorer than that of vitamin C.The samples decreased in total antioxidant capacity(at the same concentration) in the order of gallic acid > vitamin C > the polyphenolic extract.