全封闭脆性柠檬精油微胶囊的制备及表征

发布时间：2019-05-20 16:36

【摘要】：本论文以柠檬精油为芯材,壳聚糖/三聚磷酸钠-无机粒子为复合壁材,采用复凝聚法制备了柠檬精油的全封闭天然壁材微胶囊。论文主要探讨了关键制备影响因素对微胶囊形成和包埋率的影响。主要包括：乳化剂的HLB值及其浓度、芯壁比、反应体系的pH值、固化剂浓度、SDS的用量及无机粒子等七个因素。采用傅立叶变换红外光谱仪(FT-IR)、生物显微镜、扫描电子显微镜(SEM)、紫外分光光度计、热重分析仪(TGA)对精油胶囊的结构组成、形态、密闭型及耐热性进行了表征。结果表明：精油微胶囊制备最佳工艺条件为：壳聚糖浓度为1%,壳聚糖：三聚磷酸钠为2：1,吐温-80/司盘-80复配乳化剂HLB的值为10,乳化剂用量为5%,芯壁比为3：1,反应pH值为4,固化剂加入量为2%,阴离子表面活性剂加入量0.5%,无机粒子使用量为20%。粒径4-10μ m,包埋率达到47.68%。对论文微胶囊了结构及密闭性能测试,实验结果表明：微胶囊在乙醇中测得芯材损失率仅为3%,这说明微胶囊表面致密、密闭型良好。
[Abstract]:In this paper, the total closed natural wall material microcapsules of lemon essential oil were prepared by complex coacervation method with lemon extract as core material, chitosan/ sodium tripolyphosphate-inorganic particles as composite wall material and complex coacervation method. The influence of the key preparation factors on the formation and embedding rate of the microcapsules was discussed. It mainly includes the HLB value of the emulsifier, the concentration of the emulsifier, the ratio of the core wall, the pH value of the reaction system, the concentration of the curing agent, the amount of the SDS and the inorganic particles. The structure, morphology, sealing and heat resistance of essential oil capsules were characterized by FT-IR, biological microscope, scanning electron microscope (SEM), ultraviolet spectrophotometer and thermogravimetric analyzer (TGA). The results showed that the optimum conditions for preparing the essential oil microcapsule were as follows:1% of chitosan,2:1 of chitosan,2:1 of sodium tripolyphosphate,10 for HLB of Tween-80/ Span-80,5% of emulsifier,3 to 1 of core wall and 4 for reaction pH. The addition amount of the curing agent is 2%, the addition amount of the anionic surfactant is 0.5%, and the usage amount of the inorganic particles is 20%. The particle size was 4-10 & mu; m, and the embedding rate was 47.68%. The results of the experiment show that the loss rate of the core material is only 3% in ethanol, which indicates that the surface of the microcapsule is compact and the sealing property is good.
【学位授予单位】：上海应用技术学院
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TB34

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