Factors in acid treated bagasse inhibiting ethanol production from d-xylose by Pachysolen tannophilus |
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| Authors: | Nan E Watson Bernard A Prior Pieter M Lategan Marcus Lussi |
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| Institution: | Department of Microbiology, University of the Orange Free State, P.O. Box 339, Bloemfontein 9300, South Africa;Department of Chemical Engineering, University of Natal, King George V Avenue, Durban 4000, South Africa |
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| Abstract: | The fermentation of d-xylose, the major sugar-cane bagasse hemicellulose component, to ethanol by Pachysolen tannophilus is inhibited by various factors produced or released during the acid hydrolysis of the bagasse or during the fermentation process. These include ethanol, iron, chromium, copper, nickel, acetic acid and furfural. Ethanol production by P. tannophilus is inhibited by ethanol fconcentrations >24 g l?1. Furfural and acetic acid concentrations as low as 0.3 and 7 g l?1, respectively, and iron, chromium, nickel and copper at concentrations of 0.07, 0.01, 0.01 and 0.004 g l?1, respectively. Similar concentrations may be found in acid-hydrolysed bagasse. The removal of these factors by treatment with ion-exchange resin resulted in the fermentation of the sugars to ethanol. The d-glucose was used rapidly and completely whereas d-xylose utilization was slow and incomplete. An ethanol concentration of 4.1 g l?1 was produced and an ethanol yield of 0.32 was obtained. Xylitol in significant amounts was produced. |
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| Keywords: | Ethanol inhibitors hemicellulose hydrolysis To whom correspondence should be addressed |
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