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Study on Antioxidant Activity of Polysaccharides from Dendrobium Species

ZHA Xue-qiang,WANG Jun-hui,PAN Li-hua,LUO Jian-ping,LU Ming-ming (School of Biotechnology and Food Engineering, Hefei University of Technology, Hefei 230009, China)  
The antioxidant activities of polysaccharides from Dendrobium huoshanense and Dendrobium candidum were evaluated by scavenging activities of superoxide anion (O·2) generated by pyrogallol autoxidation system and hydroxyl free radicals (·OH) generated by Fenton reaction and inhibiting activity of oxidation system of linoleic acid induced by alkyl radical. Results showed that polysaccharides from the two Dendrobium species had distinctive scavenging effects of superoxide radical and hydroxyl radical and their inhibition responses on oxidation system of linoleic acid induced by alkyl radical were also remarkable. In addition, the antioxidant activity of polysaccharides from Dendrobium huoshanense was stronger than that of Dendrobium candidum.
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