不同聚合度葡萄皮原花青素的抗氧化活性

Study on the Antioxidant Activities of Different Polymerization Degree Grape Skin Proanthocyanidins

以葡萄皮原花青素为原料,采用溶剂沉淀法根据聚合度进行分级处理。分光光度法测定了不同聚合度葡萄皮原花青素对DPPH.自由基和亚硝酸钠的清除能力,并与VC、BHT进行了比较。结果表明:葡萄皮原花青素对DPPH.自由基和NaNO2清除率与其浓度成正相关,其最大清除率分别为94.61%,92.56%。随着聚合度的增加,其清除能力下降。

Grape skin procyanidins as raw material were separated according to their polymerization degrees by solvent precipitation in this paper. The capability of scavenging sodium nitrite and DPPH ~ were determined by spec- trophotometry, and compared with vitamin C, BHT. The results demonstrated that the scavenging rate of NaNO2 and DPPH ~ showed the positive correlation with the concentration of the grape skin proanthocyanidins, the capability of scavenging NaNO2 and DPPH was 94.61% and 92.56% , respectively. It was explored that with the increase of polymerization degree, the capability of scavenging decreases.