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摘要：本文以γ-聚谷氨酸和壳聚糖为壁材以肉桂醛为芯材，采用聚电解质自组装法在常温常压下制备缓释型肉桂醛纳米胶囊。当γ-PGA，CS浓度均为1g/L，体积比为1：1时，γ-PGA/CS空壳胶囊的平均粒径和多分散系数分别为336nm，0.278。在此基础上，当体系中芯材浓度为0.7g/L时，纳米胶囊的平均粒径和多分散系数分别为384nm，0.312，包埋率及负载率分别达到理想的63.8%，187.1%。对肉桂醛纳米胶囊性能表征：包埋方式测定，说明壁材与芯材间只是简单的物理包埋；缓释性能测定，说明芯材的释放呈现两个明显的阶段，且香气在此过程中并未失真；热稳定性测定，说明芯材包埋前后最大失重速率所对应的分解温度显著提高，壁材对芯材起到了良好的保护作用；表面形态测定，说明γ-PGA/CS纳米胶囊是一种多孔性复合材料，多孔的表面为芯材的包埋提供了场所。该研究成果为载香精香料、农药、肥料型γ-PGA/CS纳米缓释胶囊的制备工艺及表征方法提供了参考。62014
毕业论文关键词： γ-聚谷氨酸；壳聚糖；肉桂醛；聚电解质自组装；纳米胶囊
Nanocapsule preparation and characterization of γ-Polyglutamic Acid/chitosan/cinnamaldehyde
Abstract:Based on the γ-Polyglutamic Acid and chitosan as wall materials with cinnamaldehyde as core material,By polyelectrolyte self-assembly method under atmospheric pressure slow-release preparation of cinnamaldehyde nano capsule.When gamma γ-PGA,CS concentration of 1 g/L, when the volume ratio of 1:1, gamma γ-PGA/CS shell capsules of the average particle size and dispersion coefficient of 336 nm, respectively is 0.278.Based on this, when the core material in the system when the concentration is 0.7 g/L, the average particle size of nanometer capsule and dispersion coefficient of 384 nm, respectively 0.312, embedding ratio and load ratio reached 63.8% of the ideal, 187.1%.Performance characterization of cinnamaldehyde nano capsule: the embedding method, shows that between the wall and core material is simply the embedding of physics; Slow-release performance measurement, the release of the core material to present two distinct phases, and the aroma is not distorted in the process; Determination of thermal stability, the core material before and after embedding corresponding to the decomposition temperature of maximum weight loss rate increased significantly, the wall materials to core material has played a good protection effect;Determination of surface morphology of gamma γ-PGA/CS nano capsule is a kind of porous materials, the surface of the porous provides the core material of the embedding place. The results of the study for flavoring, pesticides, fertilizers gamma γ-PGA/CS nano preparation technology and characterization method of sustained-release capsules provides reference.
Keywords: γ-Polyglutamic Acid;chitosan;cinnamaldehyde;Polyelectrolyte assembly;Nano capsule
目录
1绪论 1
1.1 微胶囊壁材种类 2
1.2 微胶囊的制备 2
1.3 微胶囊的应用 3
1.3.1 医药方面应用 3
1.3.2 食品方面应用 4
1.3.3 其他方面应用 4
1.4 微胶囊技术的特点 5
1.5 本课题的研究目的和意义 6
2材料和方法 7
2.1 试剂与仪器 7
2.2 拟采用的方法技术 8
2.2.1 γ-PGA/CS空壳胶囊的制备