香豆胶羧甲基化条件研究

以香豆胶片为原料，通过单因素及正交实验对香豆胶的羧甲基化条件进行优化，考察了各实验因素对羧甲基化香豆胶水溶液表观粘度的影响，得出了香豆胶羧甲基化的最佳条件：氢氧化钠（NaOH）浓度为0.15mol/L，NaOH与氯乙酸钠（ClCH₂COONa）物质的量比为1∶1.25，碱预处理时间45min，反应温度50℃，反应时间4h。同香豆胶原胶相比，改性后的香豆胶水溶液中水不溶物质量分数由35.8%降低到了7.9%，表观粘度显著提高。可为工业化生产羧甲基香豆胶提供实验依据。

The Conditions of Carboxymethylation of Fenugreek Gum

Using Fenugreek Gum pieces as feed stock, the technological conditions for preparation of carboxymethyl Fenumgreek Gum are optimized, and the optimal reaction conditions are determined by a series of orthogonal trials and single-fact test. The influence of experimental factors on apparent viscosity of Carboxymethylation Fenugreek Gum solution is investigated. The results indicate that the optimal reaction condition is as follow: NaOH concentration is 0.15mol/L,the ratio of NaOH∶sodium chloroacetate is 1∶1.25, the alkalization pretreatment time is 45min, the reaction temperature is 50℃ and the reaction time is 4h. The water insoluble substance content is reduced from 35.8% to 7.9% and the apparent viscosity of Carboxymethylated Fenumgreek Gum is evidently enhanced,which can provide guidance for the industrializition of Carboxymethylated Fenumgreek Gum production.