Apr 1, 1976

Influence of specific growth rate on biomass yield, productivity, and compostion of Candida utilis in batch and continuous culture

Applied and Environmental Microbiology
O Paredes-LópezA Ornelas-Vale


Candida utilis was grown in batch and continuous culture on prickly pear juice as sole carbon and energy source. In batch culture the maximum specific growth rate (mum) and the substrate yield coefficient (Yps) varied according to sugar concentration. When the fermentation was carried out with 1% sugar, mum and Ys were 0.47/h and 42.6%, respectively. The best yields occurred in a chemostat at the pH range of 3.5 to 4.5 and temperature of 30 C. A beneficial effect on Ys was observed when the dilution rate (D) was increased. At a D of 0.55/h, the productivity was 2.38 g/liter per h. The maintenance coefficient attained a value of 0.09 g of sugar/g of biomass per h. Increases of D produced higher protein contents of the biomass. The information obtained indicates that protein production with Candida utilis, using prickly pear juice, should be carried out a high dilution rates where the Ys and protein content of the cell mass are also higher.

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Mentioned in this Paper

Legume Pod
Carbohydrate Metabolism
Yeast Proteins
Hydrogen-Ion Concentration
Candida utilis

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