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STRUCTURE AND CONFORMATION OF ACETAN POLYSACCHARIDE

机译:乙炔多糖的结构和构型

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摘要

Acetan is an anionic bacterial polysaccharide. The chemical repeat unit consists of a cellobiose unit solubilised by attachment of a charged pentasaccharide sidechain to one of the glucose residues. The repeat unit contains two sites of acetylation. H-1 and C-13 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. [References: 28]
机译:乙酰丙酮是一种阴离子细菌多糖。化学重复单元由纤维二糖单元组成,该纤维二糖单元通过将带电荷的五糖侧链连接至葡萄糖残基之一而增溶。重复单元包含两个乙酰化位点。 H-1和C-13 NMR研究与碱性甲基化和轻度甲基化研究一起显示,乙酰化发生在(1,2)D-Man和(1,34)D-Glc残基的C6处。包括NMR,旋光,圆二色性和DSC在内的各种技术显示出水溶液中丙酮的热可逆构象有序(螺旋)-无序(卷曲)过渡的证据。研究表明,骨架的乙酰化不能阻止螺旋的形成。 [参考:28]

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