Investigation of cultivation conditions for capsular polysaccharide production by Streptococcus pneumoniae serotype 14

• Maria de Lourdes Moura Leal ^[2] ; Denise da Silva Gomes Pereira ^[2] ; Ellen Jessouroun ^[2] ; Maria Antonieta Peixoto Gimenes Couto ^[1] ; Nei Pereira Jr ^[1]
  1. [1] Universidade Federal do Rio de Janeiro

     Universidade Federal do Rio de Janeiro

     Brasil

     
  2. [2] Fundação Oswaldo Cruz Vice-Diretoria de Desenvolvimento Tecnológico-Bio-Manguinhos Laboratório de Tecnologia Bacteriana
• Localización: Electronic Journal of Biotechnology, ISSN-e 0717-3458, Vol. 14, Nº. 5, 2011, págs. 6-6
• Idioma: inglés
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• Resumen

  • Streptococcus pneumoniae (pneumococcus) is among the most significant causes of bacterial disease in humans. Capsular polysaccharide (CPS) production is essential for pneumococcal virulence. Pneumococcal CPS has been widely used as vaccine antigen. This study is focused on the influence of culture conditions of Streptococcus pneumoniae serotype 14 as for developing an industrial method for polysaccharide production. The pH proved to be a highly important variable in batchwise culture. Using the pH control all glucose added was consumed resulting in a four-fold increase in polysaccharide productivity relative to cultivation without pH control. S. pneumoniae is a lactic acid bacterium, so named for its primary metabolic byproduct (lactate), which has an inhibitory effect on cell growth in concentrations ranging from 4 to 5 g/L. An increase of 30% in polysaccharide productivity was observed using glucose pulses with 5.5 hrs of growth, resulting in a maximum polysaccharide concentration of 185.2 mg/L. Our data suggest the possibility of using a medium of non-animal origin and employing pH control for the cultivation of pneumococcus to produce a polysaccharide vaccine.