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Neisseria meningitidis group C polysaccharide-tetanus toxoid conjugates have been prepared by using high-molecular-weight polysaccharide and purified tetanus toxoid and 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide as a coupling reagent. The influence of three conditions of preparation was studied. Biochemical assays, the enzyme-linked immunosorbent assay, and isopycnic CsCl gradient ultracentrifugation have been used to characterize the conjugates. The polysaccharide-to-protein ratios of the various conjugate preparations showed differences. The ability of the group C polysaccharide component to react with specific antibodies was reduced, whereas most of the tetanus toxoid seemed to be hidden by the polysaccharide. The composition of the conjugate was not homogeneous, and at least 10% of free polysaccharide was present. Thermostability in lyophilized condition in the presence of lactose was excellent.

Preparation and immunochemical characterization of meningococcal group C polysaccharide-tetanus toxoid conjugates as a new generation of vaccines