A total of 43 Forest Products Laboratory (FPL) strains of Pichia stipitis and Candida shehatae were tested for their ability to
ferment a 1:1 mixture of glucose and xylose to ethanol prior to fermentation of partially deacidi®ed wood hydrolyzates. The starting sugar composition, pH, and concentrations of inhibitors such as acetic acid, furfural, and hydroxy methyl furfural varied from one batch to another. The delay observed in growth and fermentation depended on the amounts of inhibitors present and on the capacity of the strain to resist them. The ethanol production rates and yields obtained with C. shehatae were higher than those with P. stipitis. C. shehatae strain FPL-Y-049 produced up to 34 g/l ethanol from batch VII of wood hydrolyzates. All the glucose, mannose, galactose and xylose in the wood hydrolyzate were consumed during fermentation.
A total of 43 Forest Products Laboratory (FPL) strains of Pichia stipitis and Candida shehatae were tested for their ability to
ferment a 1:1 mixture of glucose and xylose to ethanol prior to fermentation of partially deacidi®ed wood hydrolyzates. The starting sugar composition, pH, and concentrations of inhibitors such as acetic acid, furfural, and hydroxy methyl furfural varied from one batch to another. The delay observed in growth and fermentation depended on the amounts of inhibitors present and on the capacity of the strain to resist them. The ethanol production rates and yields obtained with C. shehatae were higher than those with P. stipitis. C. shehatae strain FPL-Y-049 produced up to 34 g/l ethanol from batch VII of wood hydrolyzates. All the glucose, mannose, galactose and xylose in the wood hydrolyzate were consumed during fermentation.
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