Effect of inoculum level on xylitol production from rice straw hemicellulose hydrolysate by Candida guilliermondii

The effect of inoculum level on xylitol production by Candida guilliermondii was evaluated in a rice straw hemicellulose hydrolysate. High initial cell density did not show a positive effect in this bioconversion since increasing the initial cell density from 0.67 g L(-1) to 2.41 g L(-1) decreased both the rate of xylose utilization and xylitol accumulation, The maximum xylitol yield (0.71 g g(-1)) and volumetric productivity (0.56 g L(-1) h(-1)) were reached with an inoculum level of 0.9 g L(-1). These results show that under appropriate inoculum conditions rice straw hemicellulose hydrolysate can be converted into xylitol by the yeast C. guilliermondii with efficiency values as high as 77% of the theoretical maximum.