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首页> 外文期刊>Journal of Wood Chemistry and Technology >ENHANCED XYLOOLIGOSACCHARIDES YIELDS AND ENZYMATIC HYDROLYZABILITY OF CELLULOSE USING ACETIC ACID CATALYSIS OF POPLAR SAWDUST
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ENHANCED XYLOOLIGOSACCHARIDES YIELDS AND ENZYMATIC HYDROLYZABILITY OF CELLULOSE USING ACETIC ACID CATALYSIS OF POPLAR SAWDUST

机译：杨木屑的乙酸催化增强木糖寡糖的得率和纤维素的酶水解性

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摘要

To increase the value and promote the utilization of woody processing residues, poplar sawdust was used to produce xylooligosaccharides (XOS) with polymerization degrees of 2-6 by acetic acid catalysis. This process is considered to be an environmental friendly process, and the remaining solid fraction was decomposed to fermentable sugars by enzymatic hydrolysis. Response surface methodology (RSM) was applied to determine the main factors affecting the yield of XOS. XOS production was optimal at 170±3℃ with a 6.5 ±1% acetic acid concentration and 27 ± 2min reaction time. These conditions produced a 36.0 ± 0.8% XOS yield from xylan, similar to the predicted value from the model. Careful analysis of the kinetic profile of XOS revealed that xylobiose to xylohexaose were the main products. Detectable degraded chemicals accounted for 71.0% xylan during acidic hydrolysis. When using enzymatic hydrolysis at a cellulase loading of 20 FPU/g cellulose, a 51.0% yield was achieved, which represented an 80% increase relative to pretreated autohydrolysis (28.3%), and reached production yields similar to that of diluted sulfuric acid pretreatment.
机译：为了提高价值并促进木质加工残渣的利用，杨木锯末通过乙酸催化生产聚合度为2-6的木寡糖（XOS）。该方法被认为是环境友好的方法，并且剩余的固体部分通过酶促水解被分解成可发酵的糖。应用响应面方法（RSM）确定影响XOS产量的主要因素。 XOS的生产在170±3℃时最佳，乙酸浓度为6.5±1％，反应时间为27±2min。这些条件使木聚糖的XOS收率为36.0±0.8％，与模型的预测值相似。仔细分析XOS的动力学特征表明，木糖到木己糖是主要产物。在酸性水解过程中，可检测到的降解化学物质占木聚糖的71.0％。当在20 FPU / g纤维素的纤维素酶负载量下使用酶促水解时，可达到51.0％的收率，相对于预处理的自水解（28.3％）增加了80％，并达到了与稀硫酸预处理相似的产量。

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