Effect of aeration rates on production of extracellular polysaccharide, EPS-R, by marine bacterium Hahella chejuensis

Abstract

The production of an extracellular polysaccharide, EPS-R, from the marine bacterium Hahella chejuensis was investigated at various aeration rates in a batch culture. Higher aeration rate resulted in enhanced EPS production and increased the viscosity of the culture broth. At an aeration rate of 1.5 vvm, EPS-R (12.2 g/L) was obtained with a yield (YP/S) of 0.6 from the STN medium after 72 h of cultivation. The H. chejuensis cells changed their rod morphology to a short-rod form in the stationary growth phase.