Abstract
The structure of the capsular polysaccharide from E. coli O9:K37 (A 84a) has been studied, using methylation analysis, Smith degradation, and graded acid hydrolysis. The configuration at the anomeric centres were assigned by 1H-n.m.r. spectroscopy of the polysaccharide and its derivatives and oligosaccharide fragments. The polysaccharide has the following trisaccharide repeating-unit which is unique in the E. coli series of capsular polysaccharides in possessing a 1-carboxy-ethylidene group as the sole acidic function. ▪
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