A MODEL PREDICTING THE EFFECTS OF OSCILLATING DISSOLVED OXYGEN TENSION ON THE MOLECULAR WEIGHT OF ALGINATE BY AZOTOBACTER VINELANDII
A semiempirical model that describes and predicts the evolution of alginate mean molecular weight (MMW) produced by Azotobacter vinelandii, from cultures carried out under oscillating dissolved oxygen tension (DOT), was developed. Data from the literature of cultures carried out at constant DOT was used. The model is able to explain that the main effect on the MMW of alginate is linked with the amplitude of the DOT sinusoidal wave. The model also predicts the weak effect of the oscillating DOT over kinetics of biomass growth, alginate production and sucrose consumption, as compared with cultures conducted at constant DOT.
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