Abstract
The quantitative effects of oxygen supply in terms of shaking speed and medium volume on the production of mycelia and extracellular polysaccharide (EPS) using Ganoderma tsugae in submerged fermentation were investigated. Mycelia growth required the proper shaking speed at 134 rpm for breaking a larger pellet into several smaller pellets. Furthermore, high level of medium volume for consumption of abundant nutrient is needed for maximum mycelia growth. For EPS, a high agitation is needed to promote a good mass transfer for achieving high product concentrations recovery. The appropriate medium volume was found to be 150.4 mL for aiding to produce a secondary metabolite by promoting the mass transfer of substrates. The dry cell mass (DCM)-EPS diagram of G. tsugae was created from the both production equations which this diagram is an useful tool for submerge fermentation industry for decision about to control the both productions.
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