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O135 serotype Vibrio cholerae isolated from Slovak river was used as a source of surface polysaccharide antigens. Following detoxification procedure, fractions of polysaccharides were separated by size exclusion chromatography. Two resultant fractions were the capsular polysaccharide (Mw ∼ 197,000 Da) and the lipopolysaccharide fragment (Mw ∼ 13,300 Da). These materials were used for preparation of four novel glycoconjugates. Two of them containing detoxified lipopolysaccharide as antigen were prepared by original chemical method using the new biocompatible polymer as carrier of antigen. Additionally, other two conjugates were prepared by direct linking of capsular and detoxified lipopolysaccharide antigens to the protein carrier using adipic acid dihydrazide spacer. The immunogenicities (induced IgM, IgG, IgA antibodies) of all conjugates were determined by enzyme-linked immunosorbent assay. Polymer containing conjugates elicited higher levels of specific anti-lipopolysaccharide IgM and IgG antibodies in comparison with other conjugates without polymer carrier. Enhanced IgM vibriocidal activity of mice antisera was also evident here.

biologia

Immunomodulative properties of conjugates composed of detoxified lipopolysaccharide and capsular polysaccharide of Vibrio cholerae O135 bound to BSA-protein carrier