马铃薯皮中多酚类物质的抗氧化性研究

Study on Antioxidant Activity of Polyphenols From Potato Peel

通过体外抗氧化体系测定马铃薯皮多酚的抗氧化活性。除超氧阴离子的能力;马铃薯皮多酚清除羟基自由基的能力;马铃薯皮多酚清除DPPH自由基的能力;马铃薯皮多酚对油脂的抗氧化能力。马铃薯皮多酚对超氧阴离子的清除率最高达18.33%,且在低浓度清除能力明显高于同浓度抗坏血酸(Vc);马铃薯皮多酚对羟基自由基的清除率最高达92.26%。对DPPH自由基清除率最高达86.08%。油脂中添加马铃薯皮多酚提取液,可以明显降低油脂的过氧化值(POV)。马铃薯皮多酚对超氧阴离子,羟基自由基和DPPH自由基都有很好的清除效果,且在一定程度上降低油脂过氧化值随时间而延长的程度,是很好的天然抗氧化剂。

The antioxidant activity of polyphenol from potato peel was determined by in vitro antioxidant system. At first, ultrasonic assisted extraction of polyphenols from potato peel was carried out. And then properties of potato peel polyphenols in different system were investigated, such as superoxide anion scavenging ability, hydroxyl radical scavenging capacity,DPPH free radical scavenging ability and antioxidant ability. The results show that the superoxide anion radical scavenging capacity of potato peel polyphenols is up to 18.33%, and its scavenging capacity under low concentration is significantly higher than that of ascorbic acid（Vc） with the same concentration; Hydroxyl radical scavenging rate of potato peel polyphenols is up to 92.26%;DPPH free radical scavenging rate of potato pell polyphenols is up to 86.08%. Peroxide value（POV） of oil can be significantly decreased by adding potato peel polyphenols. So potato peel polyphenols have good scavenging effect on superoxide anion, hydroxyl radicals and DPPH radicals, and can reduce the oil POV, and are a kind of good natural antioxidant.