Continuous process for yeast biomass production from sugar beet stillage by a novel strain of Candida rugosa and protein profile of the yeast

Abstract

Thermotolerant yeast Candida rugosa isolated from East Africa was used for the continuous production of yeast protein from sugar beet stillages at 40 degrees C. At a dilution rate of 0.15 h(-1), biomass productivity was at a maximum (0.85 dm(-3) h(-1)) and the Chemical Oxygen Demand reduction rate of the stillage was 30.4%. This yeast contained 45.1% crude protein, 36.5% actual protein and 5.6% RNA. The yeast protein had adequate essential amino acids, except for sulphur-containing types.