Evaluation of xylitol production from corn cob hemicellulose hydrolysate by Candida parapsilosis

Abstract

Candida parapsilosis was grown for 59 h in a medium containing corn cob hydrolysate consisting of 50 g xylose l−1, 3.0 g glucose l−1, 2.0 g arabinose l−1, and 0.9 g acetic acid l−1. A biomass of 9.1 g l−1 was produced with 36 g xylitol l−1 and 2.5 g ethanol l−1. In a medium containing 50 g xylose l−1 instead of corn cob hydrolysate, the concentrations of cells, xylitol, and ethanol were 8.6 g l−1, 33 g l−1, and 0.2 g l−1, respectively. The differences between two cultures were due to the glucose and arabinose in the corn cob hydrolysate stimulating growth and the low concentration of acetic acid stimulating xylitol production.