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The present study aimed at investigating the structural features and antioxidant activities of a polysaccharide fraction (DHP1A) obtained from Dendrobium huoshanense, a precious herb medicine in China. DHP1A mainly consisted of mannose (Man), glucose (Glc) and a trace of galactose (Gal), with a molecular weight of 6700Da. Its backbone contained (1→4)-linked α-D-Glcp, (1→6)-linked α-D-Glcp and (1→4)-linked...