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Enhancement of enzymatic in situ saccharification of cellulose in aqueous-ionic liquid media by ultrasonic intensification

机译：超声增强水离子液体介质中纤维素的酶促原位糖化作用

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摘要

A new approach for in situ enzymatic saccharification of cellulose in ionic liquids (ILs)-aqueous media is presented in which ultrasonic pretreatment was used to enhance the conversion of cellulose. For this purpose, the solubility of cellulose and the activity of cellulase were investigated in six alkylphosphate ILs. 1-Methyl-3-methylimidazolium dimethylphosphate ([Mmim][DMP]) giving favorable solubility and biocompatibility was selected to establish aqueous-ILs system for enzymatic in situ saccharification of cellulose. After further optimization of reaction parameters concerning cellulase concentration, temperature and IL concentration, higher conversion (95.48%) of cellulose was obtained in the media of aqueous-[Mmim][DMP] by conducting the pretreatment of cellulose with ultrasonic heating, whereas the conversion of cellulose untreated was 42.77%. Scanning electronic microscopy (SEM) and viscosity analysis indicated that IL-treated cellulose under ultrasonic condition was subjected to depolymerizadon, which led to more efficient saccharification. The findings of this study would have great implications for developing a continuous process for transformation of biomass such as straw cellulose to ethanol or other hydrocarbons. (C) 2010 Elsevier Ltd. All rights reserved.
机译：提出了一种在离子液体（ILs）-水性介质中纤维素原位酶促糖化的新方法，其中超声预处理用于增强纤维素的转化。为此，在六个烷基磷酸酯ILs中研究了纤维素的溶解度和纤维素酶的活性。选择具有良好溶解性和生物相容性的1-甲基-3-甲基咪唑二甲基磷酸二甲酯（[Mmim] [DMP]），以建立水-ILs体系进行纤维素酶原位糖化。在进一步优化了有关纤维素酶浓度，温度和IL浓度的反应参数后，通过对纤维素进行超声波加热预处理，可以在[Mmim] [DMP]水溶液中获得更高的纤维素转化率（95.48％）。未经处理的纤维素的42.77％。扫描电子显微镜（SEM）和粘度分析表明，经IL处理的纤维素在超声条件下进行解聚，从而导致更有效的糖化。这项研究的发现对于开发将生物质（例如稻草纤维素）转化为乙醇或其他碳氢化合物的连续过程具有重大意义。 （C）2010 Elsevier Ltd.保留所有权利。

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