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Optimization of sulfuric acid hydrolysis conditions for preparation of nanocrystalline cellulose from enzymatically pretreated fibers

机译：从酶法预处理纤维制备纳米晶纤维素的硫酸水解条件优化

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摘要

Preparation of nanocrystalline cellulose (NCC) by 62 and 65 % wt. sulfuric acid hydrolysis of cellulase-pretreated fibers was optimized to obtain the highest yield by applying two statistical plans. At optimal conditions (10 U/g odp cellulase, 25 min hydrolysis, 47 A degrees C, 62 wt.% H2SO4), high yields (a parts per thousand yen80 %) were obtained, including an increase of similar to 9 points due to the enzyme. Optimal conditions produced nanosized particles of around similar to 200 nm with reduced surface charge and sulfur content. The optimization allowed reduction of hydrolysis time by 44 % and increase of yield by more than 10 points compared with results in previous work. The effects of cellulase pretreatment were noticeable even under aggressive hydrolysis conditions, emphasizing its possibilities. Zeta potential and polydispersity index indicated that all studied conditions led to good-quality final products, with values around -50 mV and 0.2, respectively. Transmission electron microscopy (TEM) analysis confirmed the presence of NCC. Fourier-transform infrared (FTIR) spectroscopic analysis provided evidence that cellulase treatment increased the crystallinity of both cellulose fibers and NCC, as well as fiber accessibility, supporting the other analyses of NCC.
机译：制备62和65重量％的纳米晶纤维素（NCC）。通过应用两个统计计划，对纤维素酶预处理的纤维的硫酸水解进行了优化，以获得最高的产量。在最佳条件下（10 U / g odp纤维素酶，25分钟水解，47 A摄氏度，62 wt％的H2SO4），获得了高收率（千分之几的80％），包括由于酶。最佳条件可产生约200 nm左右的纳米颗粒，且表面电荷和硫含量降低。与之前的结果相比，优化使水解时间减少了44％，并使收率提高了10个百分点以上。纤维素酶预处理的效果即使在激烈的水解条件下也很明显，强调了其可能性。 Zeta电位和多分散指数表明，所有研究条件均产生了优质的最终产品，其值分别约为-50 mV和0.2。透射电子显微镜（TEM）分析证实了NCC的存在。傅里叶变换红外（FTIR）光谱分析提供了证据表明，纤维素酶处理可提高纤维素纤维和NCC的结晶度以及纤维可及性，从而支持NCC的其他分析。

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