Analysis by the reductive-cleavage method of linkage positions in a polysaccharide containing 4-linked d-glucopyranosyluronic residues
作者:Sally A. Vodonik、Gary R. Gray
DOI:10.1016/0008-6215(88)80159-9
日期:1988.4
6,6-dideuterio isomer. Although the reductive-cleavage technique is suitable for the direct analysis of polysaccharides containing 4-linked D-glucopyranosyluronic residues, it does not establish whether the uronic residue is a 4-linked pyranoside or a 5-linked furanoside. The expected product is, however, derived from the 4-linked D-glucopyranosyluronic residue after sequential methylation, reduction
通过使用产气克雷伯氏菌54型菌株A3荚膜多糖研究了4-连接的D-吡喃葡萄糖基尿嘧啶残基在还原裂解条件下的命运。在二氯甲烷中用三乙基硅烷和三甲基甲硅烷基三氟甲磺酸酯处理完全甲基化的多糖,然后进行原位乙酰化,得到1,5-脱水-2,3,4,6-四-O-甲基-D-葡萄糖醇,3,4-二-O-乙酰基-1,5-脱水-2,6-二-O-甲基-D-葡萄糖醇和3-O-乙酰基-1,5-脱水-2,4-二-O-甲基-L-果糖醇,如预期的那样,但是4-连接的D-吡喃葡萄糖基糖醛酸残基,即3-O-乙酰基-2,6-脱水-4,5-二-O-甲基-L-古洛糖酸酯的还原性切割的预期产物,未观察到。取而代之的是甲基2-O-乙酰-3,6-脱水4- 5-二-O-甲基-L-古洛糖酸酯(6)被确定为4-连接的D-吡喃葡萄糖基糖醛酸残基的还原裂解的唯一产物。该化合物6是由于还原性切割而不是5-连接的D-葡糖呋喃糖浆残基的还原性切割而发生的重排