Structural Studies of the O‐Specific Polysaccharide of Hafnia alvei Strain PCM 1206 Lipopolysaccharide Containing D‐Allothreonine

The structure of the O‐specific side‐chain of the Hafnia alvei strain PCM 1206 lipopolysaccharide has been investigated. Methylation analysis, partial acid hydrolysis, FAB‐MS/MS and 1 H‐NMR and 13 C‐NMR spectroscopy were the principal methods used. d ‐Allothreonine ( d ‐aThr), amide‐linked to the d ‐galacturonic acid, was identified as a constituent in the polysaccharide and the following structure of a pentasaccharide repeating unit was established: image