3) Emulsion, microemulsion and microcapsules in liquid phase all have certain antibacterial property。 Both kind of microemulsion and microcapsule with chitosan/sodium tripolyphosphate has poor antibacterial performance than general emulsion, but antibacterial property of microcapsule with cyclodextrin is better than general emulsion and is still outstanding in lower concentration。 Obviously the antibacterial properties of microcapsules can be used on condition that appropriate wall material, condensed mode and water-soluble is found。

4) Antibacterial properties of general emulsion and microemulsion can be found in solid phase but none of microcapsules。 The bacteriostasis of microcapsule in the solid phase has no great value。

5) Antibacterial properties of microcapsules can be found if fumigated in gas phase when essential oil is at low concentration but none of general emulsion and microemulsion。 Therefore microcapsule can improve the efficacy of essential oil even if in the condition of high temperature and low concentration profiting from its controlled release

Key Words:  microcapsule; microemulsion; bacteriostatic action; Escherichia coli; lavender essential oil

目录

1。 绪论 9

1。1 化妆品中的病原性微生物 9

1。1。1国内化妆品微生物的现状 9

1。1。2 化妆品中的大肠杆菌 9

1。1。3 化妆品中的金黄色葡萄球菌 9

1。1。4 化妆品中的铜绿假单胞菌 10

1。1。5 化妆品的细菌总数 10

1。1。6化妆品中的霉菌 10

1。1。7化妆品中抑菌剂 10

1。2 微乳液技术的概述 10

1。2。1微乳液的概念 10

1。2。2微乳液的分类及优势 11

1。2。3 微乳液的机理 11

1。2。4微乳液的制备 12

1。3 微胶囊技术的概述 13

1。3。1 微胶囊的概念 13

1。3。2微胶囊的特点和优势 13

1。3。3 常用的几种微胶囊技术 13

2。 实验材料和方法 14

2。1 实验材料 14

2。1。1 主要仪器 14

2。1。2 实验试剂 15

2。1。3 精油 15

2。1。4 病原菌和培养基的准备 16

2。2 实验方法 16

2。2。1 几种不同精油的乳液制备 16

2。2。2 薰衣草微胶囊的制备 16

2。2。3 薰衣草微乳液的制备 17

2。2。4 测定几种精油对大肠杆菌的MIC以及其熏蒸效果 17

2。2。5 通过对大肠杆菌MIC测定微胶囊壁材对微胶囊抑菌性能影响 18

2。2。6 薰衣草精油乳液、微乳液、微胶囊对大肠杆菌液相MIC对比 18