Abstract
Lipopolysaccharides (LPS) from Leptotrichia buccalis, strains LI 1, ATCG 14201 and ATCG 19616 were partially degraded with 1 % acetic acid. The acid soluble polysaccharides were subjected to gel filtration. These experiments showed that the carbohydrate moiety of LPS from ATGC 14201 and ATCG 19616 were similar, consisting ofa core oligosaccharide unsubstituted by 0-side chains containing galactose, glucose and D-glycero-D-manno-heptose as neutral sugars. The core analogous fraction isolated from LI 1 LPS contained the same three neutral sugars, but in different ratios.

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