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Sulfated modification, characterization and property of a water-insoluble polysaccharide from Ganoderma atrum

Zhang, H., Wang, J.Q., Nie, S.P., Wang, Y.X., Cui, S.W., Xie, M.Y. (2015). Sulfated modification, characterization and property of a water-insoluble polysaccharide from Ganoderma atrum, 79 248-255. http://dx.doi.org/10.1016/j.ijbiomac.2015.04.070

Abstract

© 2015 Elsevier B.V. Sulfated modification was carried out to modify a water-insoluble polysaccharide from Ganoderma atrum (AGAP). The effects of sulfation on structure, physicochemical and functional properties of AGAP were investigated. Three sulfated derivatives were prepared, designated as S-1, S-2 and S-3 with degree of substitution (DS) of 0.35, 0.74 and 1.14, respectively. AGAP was elucidated as an α-(1→3)-glucan with few branches terminated by single mannose or xylose residues. The molecular weight (M<inf>w</inf>) and radius of gyration (R<inf>g</inf>) were estimated to be 1665kDa and 65.49nm, respectively. After sulfated modification, non-selective sulfation occurred preferably at O-6, partially at O-2 and O-4 positions of the glucosyl residues. The water-solubility of the derivatives was significantly improved in a DS-dependent manner. M<inf>w</inf> of the derivatives showed a sharp decrease, and the chain conformation was estimated to be expanded stiff in phosphate buffer. In vitro tests showed that sulfated modification improved its antioxidant activities and anti-proliferative ability against S-180 tumor cells. This study suggested that sulfated modification was an effective approach to improve the water-solubility and functional properties of insoluble polysaccharides.

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