Abstract
Several yeasts isolated in acetate media utilized xylose in addition to acetate. A strain of Geotrichum candidum and Candida utilis ATCC 9256 were selected for further investigation. Both yeasts completely utilized xylose, acetic acid and glucose in bagasse hemicellulose and cellulose hydrolysates. Geotrichum candidum yielded more biomass (19·5 g liter −1) than C. utilis (15·0 g liter −1) in the hemicellulose hydrolysate, but G. candidum required a longer cultivation period (100 h) to reach the maximal biomass concentration than did C. utilis (58 h). Similar parameters of growth and substrate utilization were recorded for both yeasts in hemicellulose hydrolysate and simulated hydrolysate media, respectively. Likewise, C. utilis utilized bagasse cellulose hydrolysate and simulated cellulose hydrolysate at the same rate and with the same biomass yield coefficient. In combined cellulose and hemicellulose hydrolysates, G. candidum and C. utilis produced 19·5 g liter −1 biomass within 24 h and 16·5 g liter −1 biomass within 27 h, respectively. The results showed that both hemicellulose and cellulose hydrolysates were non-inhibitory to these yeasts and could serve as substrates for yeast biomass production. The growth of G. candidum compared favorably with that of C. utilis.
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