3种念珠藻多糖对自由基的清除作用

Radical Scavenging Activities of Polysaccharides in Three Nostoc Species

摘要: 研究了地木耳(Nostoc commune)、葛仙米(N.sphaeroides)和发菜(N.flagelliforme)3种念珠藻多糖对自由基的清除作用。结果表明,3种念珠藻多糖对超氧阴离子自由基和羟自由基具有很强的清除作用,且呈量效关系,地木耳清除超氧自由基作用最强,最高清除率达72.3%,葛仙米和发菜分别为46.7%、35.5%;发菜清除羟自由基效果最强,最高清除率达74.3%,葛仙米和地木耳清除率分别为49.0%、46.7%;3种念珠藻多糖对DPPH自由基的清除作用不显著。

Abstract: The radical scavenging activities of polysaccharides in three Nostoc species were investigated employing three in vitro systems.The result showed that they all have a concentration-dependent scavenging effect on superoxide anion radical and hydroxyl radical.N.commune,with a high inhibition rate of 72.3% at 40μg/mL,was the most effective scavenger on superoxide radical,while that were 46.7%and 35.5% of N.sphaeroides and N.flagelliforme respectively.Moreover,N.flagelliforme showed an excellent capacity on hydroxyl radical scavenging.Its maximal scavenging effect was 74.3% at the test concentration of 30μg/mL,while 49.0% and 46.7% were N.sphaeroides and N.commune’s,respectively.However,three Nostoc polysaccharides had no significant effect on DPPH radical scavenging.