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Capsular polysaccharide materials from several different klebsiella serotypes were demonstrated to contain an α-keto acid characterized as pyruvic acid. Linkage to the capsular polysaccharides was shown to be acid labile and alkali stable, suggesting ketosidic rather than ester linkages.

Occurrence of Pyruvic Acid in Capsular Polysaccharides from VariousKlebsiellaSpecies