Structure Investigation on PSM2b-A,A Polysaccharide of Moutan Cortex

The structure of an acidic polysaccharide PSM2b-A extracted from the cortex of Paeonia suffruticosa Andr.has been investigated.The result showed that PSM2b-A was composed of L-Rha,L-Ara,D-Xyl,D-Glc,D-Gal and D-Man containing uronic acid and traces of protein.By using chemical techniques such as methylation analysis,partial acidic hydrolysis,periodate oxidation,Smith degradation and IR,13C NMR spectroscopy,the structure of PSM2b-A was deduced characteristic of a low branched heteropolysaccharide with a linkage of(1→6),(1→4) as a main chain which could further form into higher structure by means of intermolecular hydrogen bond.