Structural analysis of a polysaccharide from Fructus Mori Albae

Fructus Mori Albae polysaccharide (FMAP) was first isolated from Fructus Mori Albae, and purified by Sephadex G-200 column chromatography. Its average molecular weight (Mw = 1.30 × 105) was determined by gel permeation chromatography (GPC). The polysaccharide was found to be composed of d-galactose, d-mannose and d-glucose by TLC and GC–MS. According to IR, methylation and GC–MS, the main chain of the polysaccharide consists of (1 → 3)-linked mannan with branches of galactosyl and glucosyl residues at O-6 on mannosyl residues of the backbone.