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Lipopolysaccharide (LPS) was purified from strains of Yersinia enterocolitica belonging to serogroups 03 and 09, by three methods, and analysed by SDS-PAGE and silver staining for carbohydrate. SDS-PAGE of LPS prepared from whole-cells by digestion with proteinase-K, produced profiles containing high molecular mass LPS and a lower molecular mass region migrating as discrete bands. LPS prepared from strains belonging to serogroup 03, using a hot-phenol procedure alone was found to contain cellular proteins, and LPS prepared from strains of serogroup 09, by this method, did not contain high molecular mass carbohydrate. A novel method of preparing LPS by digesting bacterial outer membranes with proteinase-K prior to hot-phenol extraction produced protein-free LPS from strain of Y. enterocolitica 03 and high molecular mass LPS from strains belonging to serogroup 09.

Purification of lipopolysaccharide from strains of Yersinia enterocolitica belonging to serogroups 03 and 09