Structure and conformation of acetan (cas 110865-71-9) polysaccharide
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Add time:08/19/2019 Source:sciencedirect.com
acetan (cas 110865-71-9) is an anionic bacterial polysaccharide. The chemical repeat unit consists of a cellobiose unit solubilished by attachment of a charged pentasaccharide sidechain to one of the glucose residues. The repeat unit contains two sites of acetylation. 1H and 13C NMR studies, coupled with both basic-methylation and mild-methylation studies, have shown that acetylation occurs at C6 on the (1,2)D-Man and the (1,34)D-Glc residues. A variety of techniques including NMR, optical rotation, circular dichroism and DSC show evidence for a thermoreversible conformational order (helix)-disorder (coil) transition for acetan in aqueous solution. The studies suggest that acetylation of the backbone does not prevent helix formation.
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