Abstract

GONZALEZ RAMIREZ, María Lorena; PARRA PEDROSA, Ángela María; ARIAS PALACIOS, Janeth  and  FORERO LOZANO, Milton. Laboratory production of Clostridium septicum IRP15 for the formulation of a veterinary vaccine. Rev Cubana Farm [online]. 2014, vol.48, n.2, pp.250-260. ISSN 0034-7515.

Objective: to set the laboratory production conditions of Clostridium septicum IRP15 alpha toxin for the formulation of a veterinary vaccine and the optimization of the productive process. Methods: the appropriate inoculum age for the cultures was characterized and standardized in a 7L New Brunswick Scientific biorreactor. The conditions of culturing were C. septicum IRP15 strain, VBH medium at 5 L/7 L glass, 250 mL (5 %) inoculum, 37 ºC, and 24 h under shaking conditions of 0, 25 y 50 r.p.m. The following kinetic parameters were monitored: morphological changes, biomass production, glucose consumption and toxin production. Results: for the shaking conditions at 0 and 25 r.p.m., C. septicum did not show an adaptation phase growth. The bacteria kept growing at the log phase up to 4-6 hours of fermentation respectively, thus consuming the highest amount of glucose from the medium. As from the growth phase hours till the 24 h of cultivation, the 50 % lethal dose (LD₅₀) in mice assay was conducted and at 25 r.p.m. condition, the best titre of toxin was reached (1/23). The cultures at 50 r.p.m. condition showed that the bacteria experienced adaptation phase for almost four hours, resulting in delayed biomass production, glucose consumption and toxin production. These results suggested that 50 r.p.m. is not useful for the antigen production. Conclusions : the toxin production occurred at the log phase and during the stationary phase, thus it is associated to growth and to sporulation.

Keywords : fermentation; shaking; bioreactor; inoculum; kinetics.

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