Laboratory of Applied Biocatalysis and §State Key Laboratory of Pulp and Paper Engineering, South China University of Technology , 381 Wushan Street, Guangzhou 510640, China.
J Agric Food Chem. 2014 Feb 26;62(8):1905-11. doi: 10.1021/jf405712b. Epub 2014 Feb 17.
A new sucralose-derived solid acid catalyst (SUCRA-SO3H), containing -Cl and -SO3H functional groups, has been shown to be highly effective for hydrolyzing β-1,4-glucans, completely hydrolyzing cellobiose (1) into glucose (2) in 3 h and converting the microcrystalline cellulose pretreated by the ionic liquid into glucose (2) with a yield of around 55% and a selectivity of 98% within 24 h at a relatively moderate temperature (393K). The enhanced adsorption capacity that the catalyst has for glucan by virtue of the presence of chloride groups that act as cellulose-binding sites offers the possibility of resolving the existing bottleneck in heterogeneous catalysis to hydrolyze cellulose, namely, the low accessibility of cellulose to the reaction position in typical solid catalysts. The apparent activation energy for hydrolysis of cellobiose (1) with SUCRA-SO3H was 94 kJ/mol, which was much lower than that with sulfuric acid (133 kJ/mol) and the corresponding sucrose-derived catalyst (SUCRO-SO3H) without chlorine groups (114 kJ/mol).
一种新型的蔗糖衍生固体酸催化剂（SUCRA-SO3H），含有-Cl 和 -SO3H 官能团，被证明对水解β-1,4-葡聚糖非常有效，可在 3 小时内将纤维二糖（1）完全水解为葡萄糖（2），并可将离子液体预处理的微晶纤维素在相对温和的温度（393K）下在 24 小时内转化为葡萄糖（2），产率约为 55%，选择性为 98%。由于存在作为纤维素结合位点的氯基团，催化剂对葡聚糖的增强吸附能力提供了克服纤维素异相催化水解中现有瓶颈的可能性，即典型固体催化剂中纤维素对反应位置的低可及性。用 SUCRA-SO3H 水解纤维二糖（1）的表观活化能为 94 kJ/mol，明显低于硫酸（133 kJ/mol）和没有氯基团的相应蔗糖衍生催化剂（SUCRO-SO3H）（114 kJ/mol）。
