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Purification of capsular polysaccharide from Neisseria meningitidis serogroup C by liquid chromatography.

Pato TP, Barbosa Ade P, da Silva Junior JG

Departamento de Vacinas Bacterianas, Bio-Manguinhos, Fundação Oswaldo Cruz, Rio de Janeiro, Brazil. Tania@bio.fiocruz.br

Neisseria meningitidis serogroup C capsular polysaccharide (MenCPS) is an important antigen against meningococcal infection. This paper describes a new purification methodology employing liquid chromatography that resulted in a polysaccharide showing the characteristics recommended by the World Health Organization for vaccine purposes. In this method, steps of the traditional procedure that yield low recovery and use toxic materials were modified. The present process consists in the following steps: (1) continuous flow centrifugation of the culture for removal of the cells; (2) supernatant concentration by tangential filtration (100 kDa cutoff); (3) addition of 0.5% DOC, heating to 55 degrees C during 30 min and tangential filtration (100 kDa cutoff); (4) anion exchange chromatography (Source 15Q) and (5) size exclusion chromatography (Sepharose CL-4B). The polysaccharide C fraction obtained in that way was dialyzed and freeze-dried. The structural identity of the polysaccharide was demonstrated by (1)H-NMR spectrometry.

Published 7 March 2006 in J Chromatogr B Analyt Technol Biomed Life Sci, 832(2): 262-7.
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