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. 1980 Jul;29(1):171–174. doi: 10.1128/iai.29.1.171-174.1980

Preparation of a nontoxic and immunogenic polysaccharide fraction from a Haemophilus influenzae phenol-water extract.

D Raichvarg, C Brossard, J Agneray
PMCID: PMC551091  PMID: 6156911

Abstract

A phenol-water extract from Haemophilus influenzae type a was hydrolyzed to decrease the toxicity without affecting the antigenicity of the preparation. We used partial hydrolysis for 15 h with ion exchangers in the presence of chloroform. The lipid fraction was collected into the organic solvent. The preparation obtained from the aqueous solution was designated the polysaccharide fraction. Rhamnose, glucose, galactose, mannose, and glucosamine were the major components of the polysaccharide fraction, and their molar ratios were determined by gas-liquid chromatography; 2.5% myristic acid was also found in the polysaccharide fraction. The mild hydrolysis of the polysaccharide fraction for 15 h caused a marked reduction in toxicity (50% lethal dose, 183 +/- 9 microgram/kg) and pyrogenicity. The generalized Sanarelli reaction was negative. The local Shwartzman phenomenon was not observed if chloroform and Dowex were exchanged three times during hydrolysis. Most of the antigenic components remained active after the hydrolytic process. The polysaccharide fraction could also induce the formation of circulating antibodies in rabbits and also increase the phagocytic process against H. influenzae from month 2 to 6.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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