Effect of Pre-Corrected pH on the Carbohydrate Hydrolysis of Bamboo during Hydrothermal Pretreatment
Effect of Pre-Corrected pH on the Carbohydrate Hydrolysis of Bamboo during Hydrothermal Pretreatment
复制标题
水热预处理过程中预校正pH值对竹子碳水化合物水解的影响
DOI：
10.3390/polym12030612
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发表时间：
2020-03-01
期刊：
影响因子：
5
通讯作者：
Yao, Shuangquan
中科院分区：
文献类型：
--
作者：
Huang, Lingzhi;Yang, Zeguang;Yao, Shuangquan
为了确定预校正pH水热预处理在生物炼制中的应用前景，研究了pH对碳水化合物溶解和降解效率的影响。使用高效阴离子交换色谱和紫外光谱分析水解产物的物种组成。结果表明，在pH 4和170℃时，残余固体和总溶解固体之间获得最大平衡。纤维素和木质素的最大回收率符合预期，而半纤维素的回收率最低。半纤维素提取率为42.19%，低聚物形态占产品的93.39%。对经过或未经预处理的竹子的理化性质进行了表征。与传统的水热预处理相比，新型预处理竹材具有更高的纤维结晶度和热稳定性。预处理过程中，抑制了β-芳基醚键的断裂，减少了木质素的结构解离。在有效提取半纤维素的同时，保护了竹子的理化特性。为木质生物质各成分的高效利用提供理论支撑。
To confirm the prospects for application of pre-corrected pH hydrothermal pretreatment in biorefineries, the effects of pH on the dissolution and degradation efficiency of carbohydrates were studied. The species composition of the hydrolysate was analyzed using high efficiency anion exchange chromatography and UV spectroscopy. The result showed that the greatest balance between the residual solid and total dissolved solids was obtained at pH 4 and 170 °C. Maximum recovery rates of cellulose and lignin were as expected, whereas hemicellulose had the least recovery rate. The hemicellulose extraction rate was 42.19%, and the oligomer form accounted for 93.39% of the product. The physicochemical properties of bamboo with or without pretreatment was characterized. Compared with the traditional hydrothermal pretreatment, the new pretreatment bamboo has higher fiber crystallinity and thermal stability. In the pretreatment process, the fracture of β-aryl ether bond was inhibited and the structural dissociation of lignin was reduced. The physicochemical properties of bamboo was protected while the hemicellulose was extracted efficiently. It provides theoretical support for the efficient utilization of all components of woody biomass.