葡萄糖双极电化学制备草酸、山梨醇与甘露醇

Paired Electrochemistry Synthesis of Oxalic Acid,Sorbitol and Mannitol from Glucose

葡萄糖中的醛基既可以被氧化为羧基也可以被还原为羟基。文章结合葡萄糖的这一性质采用电化学合成技术,对葡萄糖双极电氧化还原反应进行了研究。产物用红外光谱(FT-IR)和核磁共振波氢谱表征,结果表明成功合成了草酸、山梨醇和甘露醇。同时考察了反应物浓度、电解质浓度、电极材料和电解时长对此反应的影响,得到的最佳反应条件为:葡萄糖的起始浓度为:阴极0.8 mol/L,阳极0.4 mol/L,支持电解质硫酸钠的浓度为0.4 mol/L、阴极的电极材料为Ni,电解时长最佳为5 h。在最优条件下,阴阳两极葡萄糖的转化率分别为71.08%、63.89%。

The aldehyde group in glucose can be oxidized to carboxyl or reduced to hydroxyl.In this paper,the bipolar redox reaction of glucose was studied by electrochemical synthesis.The products were characterized by FTIR and NMR.All the results show that oxalic acid,sorbitol and mannitol can be electrosynthesiszed successfully.The optimum reaction conditions were obtained as follows:the initial concentration of glucose was 0.8 mol/L for the cathode,0.4mol/L for the anode,the concentration of supporting electrolyte sodium sulfate was 0.4 mol/L,Ni for the cathode and the optimal electrolys is duration was 5 h.Under these conditions,the conversion rates of glucose were 71.08%and 63.89%.