Antioxidant and Antimicrobial Activities of Nostoc Commune Polysaccharides

Abstract:

Polysaccharides in Nostoc commune Vach.was extracted by water extraction and ethanol precipitation in this study.and further purification to investigated the antioxidant and antimicrobial activities.The results showed that the polysaccharides from N.commune could significantly decrease the OH and DPPH free radicals and the rate could arrived at 71.53% and 66.35% respectively.However,the Polysaccharides had little scavenging effect on superoxide anion radicals and nitrite.Furthermore,it was found that the polysaccharides could inhibit the growth of Bacillus subtilis and Escherichia coli.The minimal inhibitory concentrations(MIC) varied from 125 to 250μg/mL.No obvious inhibitory effect on Staphylosocus aureus was observed.