[Exopolysaccharide formation during the cultivation of Bacillus polymyxa on different carbohydrate substrates]

The effect of the carbohydrate source in the cultivation medium on the intensity of the synthesis of exopolysaccharides of two variants of Bacillus polymyxa was studied. No significant effect of the nature of the carbohydrate source on accumulation of the culture biomass was observed, while the fermentation broth viscosity, the yield of the extracellular polysaccharides and their monosaccharide composition, as well as the ratio of the neutral and acid components significantly changed. Differences in the composition and properties of the exopolysaccharides produced in the cultures of the variant strain under identical conditions were noted. Certain correlation between the exoproduct yield and the quantity of the accumulated biomass, as well as between the composition of the exopolysaccharides and viscosity of the fermentation broth was shown, which ensures a goal-oriented effect on the synthesis of the exopolysaccharide complex by variation of the medium composition.