| Summary: | 碩士 === 國立高雄科技大學 === 化學工程與材料工程系 === 107 === In this study, shell material chitosan and core material citrus essential oil were used to prepare microcapsules by gel method. Optical microscope, particle size distribution analyzer, zeta potential analyzer and antibacterial experiments were used to investigate the effect of surfactants, shell material and cross-linking agent on the antibacterial ability of microcapsules. Then, the feasibility of releasing rate of microcapsules measured by the electronic nose was discussed.
The experimental results showed that the microcapsules prepared by the nonionic surfactant have a narrow particle size distribution, uniform morphology and long-term dispersibility in aqueous solution. In addition, adding cross-linking agent 0.03 wt% to the microcapsules could obtain hardened essential oil microcapsules with slowest release rate. Adding chitosan 0.45 wt% and cross-linking agent 0.3 wt% could synthesis multi-nuclear cell hardened microcapsules, which could be stable in aqueous solution for a long time.
The microcapsules prepared with cationic surfactants have the highest interfacial potential (+) and the best antibacterial effect. All prepared essential oil microcapsules have better antibacterial effects against Escherichia coli than Staphylococcus aureus.
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