不同品种紫薯抗氧化物质及体外抗氧化活性比较

为比较福建产区主栽紫薯抗氧化物质成分含量及其体外抗氧化活性,对7个不同品种紫薯中总酚、总黄酮、总花色苷及花青素组分进行了分析,并测定其清除自由基活性。结果表明:福宁紫3号紫薯中所含抗氧化活性成分如总酚、总黄酮、总花色苷和花青素的含量均为最高。通过高效液相色谱法分析测定紫薯中含有的花青素单体主要为飞燕草色素、芍药色素和矢车菊色素,不同品种紫薯中花青素组成及含量表现出的一定的差异性。福宁紫3号紫薯表现出较强的自由基清除活性,0.5 mg·L-1紫薯鲜样提取液DPPH自由基、OH自由基及ABTS清除率分别达到88.4%、49.1%、90.1%。 相对于其他品种,福宁紫3号紫薯在抗氧化活性成分含量及体外抗氧化活性方面表现最佳。

Comparative Analysis of Antioxidant Compounds and Antioxidant Activities in Vitro of Different Purple Sweet Potato Varieties

To compare the contents of antioxidant components and antioxidant activities in different purple sweet potato varieties from Fujian province,total phenolic content,flavonoids,anthocyanins and anthocyanidins in 7 kinds of purple potatoes were determined and radical scavenging activities of fresh purple potatoes were investigated. The Funingzi No.3 purple sweet potato had the highest levels of antioxidant components,such as total phenolic content,flavonoids,anthocyanins and anthocyanidins. The main anthocyanidins in purple sweet potatoes were delphinidin,malvidin,peonidin and cyanidin. There were some differences of anthocyanidins kinds and contents in purple potato samples. The results also showed that Funingzi No.3 exhibited much higher radical scavenging activity. When the concentration of sample was 0.5 mg·L-1,scavenging rate of DPPH,OH and ABTS were 88.4%、49.1% and 90.1%,respectively. Relatively,Funingzi No.3 contained richer antioxidant compounds and showed much better antioxidant activities in vitro.