摘要：柠檬醛是一种重要的单萜化合物，具有柠檬样香气，是香料香精、化妆品行业最重要的物质之一。但柠檬醛在常温、酸性条件下容易氧化降解，产生异，从而限制了柠檬醛在食品，饮料，化妆品等方面的应用。用纳米包埋法制备柠檬醛乳状液能减缓柠檬醛降解速率，此外，添加适当的抗氧化剂能有效抑制柠檬醛降解。本实验使用高压乳匀法制备柠檬醛纳米乳状液，制得的纳米乳状液粒径在200nm左右。并通过乳液粒径和PDI值判定乳液稳定性，采用气相色谱法探究柠檬醛的降解情况，优化了乳液柠檬醛包埋技术。实验结果发现以阿拉伯胶和麦芽糊精作为复合壁材，在pH为3，芯壁比为1:2，壁材浓度0.1%的情况下，柠檬醛纳米乳液更加稳定。且在0.1%壁材浓度下，抗坏血酸具有更好的抗氧化能力，而0.2%壁材浓度下，没食子酸丙酯具有更好的抗氧化能力。24725
毕业论文关键词：柠檬醛；纳米乳液；抗氧化
Study on preparation of citral nanoemulsion and its stability
Abstruct: Citral is a kind of important monoterpene compounds, with lemon aroma and flavors, cosmetics industry is one of the most important matter.citral can easily undergo a series of degradation reactions, especially under low-pH condition and at room temperature. Degradation of citral will lead to production of various off-flavor compounds, which limits the use of citral in the food and beverage area. Citral degradation of emulsion is slower. Antioxidants can effectively inhibit the degradation of citral. Citral nanoemulsion was formulated through high pressure homogenization processes. The mean diameter of citral nanocapsules were 200nm. Judge the stability based on diameter. Determination of citral and several common standards of degradation products using gas chromatography retention time, explore the degradation of citral. Optimize the preparation of citral emulsion technology. The results showed that the best formulation were 0.1% arabic gum and Maltodextrin,buffer pH 3, The proportion of core material and wall material were 1:2. When the wall material concentration is 0.1%, Vc is a better antioxidant. When the wall material concentration is 0.2%, Propyl Gallate is a better antioxidant.
Key word: Citral; Nanoemulsion; Antioxidant
目 录
1 引言    1
1.1 柠檬醛概述    1
1.1.1 柠檬醛性质    1
1.1.2 柠檬醛的用途    1
1.1.3 柠檬醛的降解    1
1.2 微胶囊概述    2
1.2.1 微胶囊概念    2
1.2.2 微胶囊功能    3
1.2.3 微胶囊壁材    3
1.2.4 微胶囊制备方法    5
1.3微乳液稳定性及测定方法    5
1.3.1高压乳匀法应用及影响因素    5
1.3.2 粒径测定方法及影响因素    5
1.3.3 气相色谱测定    6
1.4 国内外乳状液包埋柠檬醛研究现状    6
1.5 研究目的和意义    7
1.6 主要研究内容    7
2 材料与方法    8
2.1 实验材料    8
2.1.1 实验原料、试剂    8
2.1.2 实验仪器与设备    8
2.2 实验方法    9
2.2.1 纳米乳液制备    9
2.2.2 粒径测定    9
2.2.3 顶空固相微萃取(HS-SPME)条件    10
2.2.4 气相色谱条件    10
3 结果与讨论    11
3.1 柠檬醛包埋技术的探究    11
3.1.1 壁材种类对柠檬醛纳米乳状液粒径大小及稳定性的影响    11
3.1.2 乳化剂对柠檬醛纳米乳状液粒径大小及稳定性的影响    11 纳米乳状液包埋柠檬醛的技术研究:http://www.751com.cn/huaxue/lunwen_18332.html