Abstract
Utilization and fermentation of xylose by the yeasts Pachysolen tannophilus I fGB 0101 and Pichia stipitis 5773 to 5776 under aerobic and anaerobic conditions are investigated. Pa. tannophilus requires biotin and thiamine for growth, whereas Pi. stipitis does not, and growth of both yeasts is stimulated by yeast extract. Pi. stipitis converts xylose (30 g/l) to ethanol under anaerobic conditions with high yields of 0,40 and it produces only low amounts of xylitol. The yield coefficient is further increased at lower xylose concentrations.
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