机械活化固相醚化法制备羧甲基淀粉和羧甲基壳聚糖混合物及其溶解性能

发布时间：2018-04-03 18:38

  本文选题：机械活化固相醚化法　切入点：羧甲基木薯淀粉和羧甲基壳聚糖混合物　出处：《食品科技》2017年09期

【摘要】：羧甲基木薯淀粉和羧甲基壳聚糖混合物不仅可有效改善淀粉物化性质,还可引入抑菌性能好的羧甲基壳聚糖。以木薯淀粉、壳聚糖为原料,氯乙酸钠为醚化剂,氢氧化钠为催化剂,采用机械活化固相醚法制备羧甲基木薯淀粉和羧甲基壳聚糖混合物。以黏度为评价指标,通过单因素和正交试验设计优化确定最佳制备工艺,采用红外光谱(Fourier transform infrared spectroscopy,FTIR)、X-射线衍射(X-ray diffraction,XRD)、扫描电镜(Scanning electron microscope,SEM)对羧甲基淀粉的结构进行表征,并考察混合物的取代度和溶解度。结果表明,机械活化破坏了淀粉、壳聚糖的结晶结构,降低结晶度,醚化试剂更容易渗透到内部使淀粉、壳聚糖发生羧甲基化反应。最佳工艺参数为:淀粉与壳聚糖质量比0.5:0.5、淀粉与氯乙酸钠的摩比1:0.9、氢氧化钠质量分数18.8%(占淀粉干基质量)、球磨温度50℃、球磨时间60 min、转速380 r/min、磨球体积500 m L。在该试验条件下制备得到的羧甲基木薯淀粉和羧甲基壳聚糖混合物的黏度为1025 m Pa·s,其中羧甲基木薯淀粉的取代度为0.79,羧甲基壳聚糖的总取代度为1.17,溶解度为90.87%,且随着壳聚糖比例增大,混合物溶解度不断减小。FTIR、XRD、SEM进一步证实木薯淀粉、壳聚糖均发生了羧甲基化反应。
[Abstract]:The mixture of carboxymethyl cassava starch and carboxymethyl chitosan can not only improve the physicochemical properties of starch, but also introduce carboxymethyl chitosan with good bacteriostasis.The mixture of carboxymethyl cassava starch and carboxymethyl chitosan was prepared with cassava starch and chitosan as raw materials, sodium chloroacetate as etherifying agent and sodium hydroxide as catalyst.The optimum preparation process was determined by single factor and orthogonal design. The structure of carboxymethyl starch was characterized by FTIR transform infrared spectroscope X-ray diffractometer and scanning electron microscope (SEM). The structure of carboxymethyl starch was characterized by scanning electron microscope (SEM) and scanning electron microscope (SEM).The substitution and solubility of the mixture were investigated.The results showed that mechanical activation destroyed the crystalline structure of starch and chitosan, reduced the crystallinity, and the etherification reagent could penetrate the starch more easily to make the starch and carboxymethylation of chitosan take place.The optimum technological parameters are as follows: the mass ratio of starch to chitosan is 0.5: 0.5, the molar ratio of starch to sodium chloroacetate is 1: 0.9, the mass fraction of sodium hydroxide is 18.8, the milling temperature is 50 鈩，

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