Abstract:

The kinetic parameters of xanthan gum fermentation production such as cell density of Xanthomonas campestris XG-101 (OD650 nm), xanthan gum concentration, viscosity, average molecular weight, pyruvic acid functional groups and residual sugar, were determined in three different mixing systems. This study proved that in cold model test, the systems of combined impellers (above: double-folded blade downflow disc turbine; below: six-blade Brumajin) and maxblend impeller have high gas hold-up and superior mass transfer performance, which can provide important theoretical guidance for improving industrial fermentation yield and quality of xanthan gum.

Key words: xanthan gum fermentation production, double-folded blade downflow disc turbine, six-blade Brumajin, maxblend, two-lay impeller, average molecular weight, pyruvic acid functional group