Detoxification of lignocellulose hydrolysates with ion-exchange resins
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Lignocellulose hydrolysates contain fermentation inhibitors causing decreased ethanol production. The inhibitors include phenolic compounds, furan aldehydes, and aliphatic acids. One of the most efficient methods for removing inhibiting compounds prior to fermentation is treatment of the hydrolysate with ion-exchange resins. The performance and detoxification mechanism of three different resins were examined: an anion exchanger, a cation exchanger, and a resin without charged groups (XAD8). A dilute acid hydrolysate of spruce was treated with the resins at pH 5.5 and 10.0 prior to ethanolic fermentation with Saccharomyces cerevisiae. In addition to the experiments with hydrolysate, the effect of the resins on selected model compounds, three phenolics (vanillin, guaiacol, and coniferyl aldehyde) and two furan aldehydes (furfural and hydroxymethyl furfural), was determined. The cation exchanger increased ethanol production, but to a lesser extent than XAD-8, which in turn was less effective than the an ion exchanger. Treatment at pH 10.0 was more effective than at pH 5.5. At pH 10.0, the anion exchanger efficiently removed both anionic and uncharged inhibitors, the latter by hydrophobic interactions. The importance of hydrophobic interactions was further indicated by a substantial decrease in the concentration of model compounds, such as guaiacol and furfural, after treatment with XAD-8.
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- Detoxification of lignocellulose hydrolysates with ion-exchange resins
Applied Biochemistry and Biotechnology
Volume 91-93, Issue 1-9 , pp 35-49
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- ethanol production
- Saccharomyces cerevisiae
- ion exchange
- Industry Sectors
- Author Affiliations
- 1. STFI, Swedish Pulp and Paper Research Institute, PO Box 5604, SE-114 86, Stockholm, Sweden
- 2. Applied Microbilogy, Lund University/Lund Institute of Technology, PO Box 124, SE-22 1 00, Lund, Sweden