芬顿试剂降解羧甲基纤维素钠的定量分析

为制备低黏度的羧甲基纤维素钠(CMC),采用芬顿(Fenton)试剂对CMC进行降解,并对降解后的产物进行定量分析。在整个反应体系中,考查了反应时间、溶液浓度、温度、p H值以及V(H2O2)/V(Fe2+)的比值对CMC降解效果的影响。试验结果表明:Fenton试剂对CMC的降解效果非常显著。由正交试验得出最佳的降解工艺条件,即在3 g/L的CMC溶液2 L、反应温度50℃、p H值为3.5、V(H2O2)∶V(Fe2+)=3∶1(0.9 m L∶0.3 m L)、反应时间为30 min时,CMC降解率达到96.05%。对降解后产物的各项性能进行定量分析,结果均符合食品添加剂的各项理化指标。

Quantitative Analysis of the Degradation of Sodium Carboxymethyl Cellulose by Fenton Reagent

In order to prepare low viscosity carboxymethyl cellulose sodium(CMC), Fenton reagent is used todegrade CMC, and the quantitative analysis is made for the degradation product. In whole reaction system,the effects of reaction time, solution concentration, temperature, p H value and V(H2O2)/V(Fe2 +) on CMC deg-radation effect are investigated. The experiment results show that effects of Fenton reagent on degradation ofCMC is very significant. The optimal degradation process conditions are obtained by orthogonal experi-ments, the degradation rate of CMC is 96.05 % on the conditions of the reaction temperature 50 ℃, p H val-ue 3.5, V(H2O2):V(Fe2+) =3∶1(0.9 m L∶0.3 m L), the response time for 30 min in 2 L 3 g/L of CMC solution.Quantitative analysis for degradation product is made, the results show various physical and chemical index-es meet the requirements of food additives.