Evaluation of Candida acidothermophilum in Ethanol Production from Lignocellulosic Biomass

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    A Saccharomyces-cerevisiae-based simultaneous saccharification and fermentation (SSF) of lignocellulosic biomass is limited to an operating temperature of about 37 degrees C, and even a small increase in temperature can have a deleterious effect. This points to a need for a more thermotolerant yeast. To this end, S. cerevisiae D5A and a thermotolerant yeast, Candida acidothermophilum, were testedat 37 degrees C, 40 degrees C, and 42 degrees C using dilute-acid-pretreated poplar as substrate. At 40 degrees C, C. acidothermophilum produced 80% of the theoritical ethanol yield, which was higher than the yield from S. cerevisiae D5A at either 37 degrees C. or 40 degrees C. At 42 degrees C, C. acidothermophilum showed a slight drop in performance. On the basis of preliminary estimates, SSFwith C. acidothermophilum at 40 degrees C can reduce cellulase costs by about 16%. Proportionately greater savings can be realized at higher temperatures if such a high-temperature SSF is feasible. This demonstrates the advantage of using thermophilic or thermotolerant yeasts.
    Original languageAmerican English
    Pages (from-to)709-713
    Number of pages5
    JournalApplied Microbiology and Biotechnology
    Issue number6
    StatePublished - 1997

    NREL Publication Number

    • NREL/JA-580-24328


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