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首页> 外文会议>22th Symposium on Biotechnology for Fuels and Chemical, 22th, May 7-11, 2000, Gatlinburg, Tennessee >Detoxification of Lignocellulose Hydrolysates with Ion-Exchange Resins
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Detoxification of Lignocellulose Hydrolysates with Ion-Exchange Resins

机译：用离子交换树脂对木质纤维素水解产物进行解毒

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摘要

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 (XAD-8). 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 anion 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.
机译：木质纤维素水解产物含有发酵抑制剂，导致乙醇产量降低。抑制剂包括酚类化合物，呋喃醛和脂族酸。在发酵之前除去抑制化合物的最有效方法之一是用离子交换树脂处理水解产物。检查了三种不同树脂的性能和解毒机理：阴离子交换剂，阳离子交换剂和不带电荷基团的树脂（XAD-8）。在用酿酒酵母进行乙醇发酵之前，用树脂在5.5和10.0的pH下处理云杉的稀酸水解产物。除了用水解产物进行实验外，还测定了树脂对所选模型化合物，三种酚醛（香兰素，愈创木酚和松柏基醛）和两种呋喃醛（糠醛和羟甲基糠醛）的影响。阳离子交换剂增加了乙醇的产量，但程度不及XAD-8，后者反而比阴离子交换剂的效力低。 pH 10.0的处理比pH 5.5的处理更有效。在pH 10.0时，阴离子交换剂可有效去除阴离子和不带电荷的抑制剂，后者通过疏水作用而去除。 XAD-8处理后，模型化合物（例如，愈创木酚和糠醛）的浓度显着降低，进一步表明了疏水相互作用的重要性。

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