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Detoxification of Lignocellulose Hydrolysates with Ion-Exchange Resins

机译：具有离子交换树脂的木质纤维素水解产物的解毒

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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 (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：木质纤维素水解酸盐含有发酵抑制剂，导致乙醇产生降低。抑制剂包括酚类化合物，呋喃醛和脂族酸。在发酵之前去除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。检查三种不同树脂的性能和排毒机制：阴离子交换器，阳离子交换器和没有带电基团的树脂（XAD-8）。在乙二醇发酵之前，用pH 5.5和10.0的树脂处理稀酸水解产物在乙二醇酵母中的酿酒酵母。除了用水解产物进行实验，确定树脂对所选择的模型化合物，三种酚醛（香草素，愈菌醇和牛醛）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生产，但在XAD-8的程度上较小，这反过来又比阴离子交换器更低。 pH10.0的处理比在pH5.5处更有效。在pH10.0，阴离子交换器有效地除去阴离子和不带电的抑制剂，后者通过疏水相互作用。通过XAD-8处理后，通过模型化合物的浓度（例如胍和糠醛）的浓度大幅下降，进一步表明了疏水相互作用的重要性。

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