_胡萝卜素液晶的制备及其稳定性研究
※基础研究食品科学
2009, Vol. 30, No. 1111
β-胡萝卜素液晶的制备及其稳定性研究
颜秀花1,2,王正武1,*,刘 峰1
(1.上海交通大学农业与生物学院,上海 200240;2.盐城工学院化学与生物工程学院,江苏 盐城 224003)摘 要:通过绘制拟三元相图对食品级β-胡萝卜素的液晶配方和工艺进行研究;用偏光显微镜、流变学方法等对非离子表面活性剂EL-35/丁酸乙酯/水的溶致液晶的形成、微观结构、动态流变性质及体系相态进行研究;对相同浓度β-胡萝卜素的液晶、微乳液和丁酸乙酯溶液进行光和pH值稳定性实验。结果表明:25℃下,β-胡萝卜素在EL-35:丁酸乙酯:水=1:1:1体系的液晶、微乳液和油溶液中对光都比较敏感,但在液晶中相对稳定:pH值对微乳液和丁酸乙酯油溶液中的β-胡萝卜素稳定性有影响,对液晶中的几乎没有影响。关键词:β-胡萝卜素;溶致液晶;制备;稳定性
Preparation and Stability of β-Carotene Liquid Crystal
YAN Xiu-hua1,2,WANG Zheng-wu1,*,LIU Feng1
(1. School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China;2. College of Chemical and Biological,Yancheng Institute of Technology,Yancheng 224003, China)
Abstract :Pseudo ternary phase diagram was conducted using water titration method to choose emulsifier EL-35-ethyl butyrate-water system to prepare β-carotene liquid crystal, and the microstructures and rheological properties of 4 emulsifier EL-35-ethylbutyrate-water systems (A1, A2, A3 and A4) with different water masses (the mass ratio of emulsifier EL-35 to ethyl butyratewere fixed at 5:5) were characterized with polarizing microscopy and rheometer. Effects of external conditions, including pHvalue, preservative (sodium benzoate), saturated ethyl butyrate solution of β-carotene and water amount on stability of this systemwere discussed. Furthermore, effects of sunlight and pH on the stability of β-carotene were compared in different multiphasesystems, including liquid crystal, microemulsion and ethyl butyrate solution. Results revealed that the optimal mass ratio of EL-35 to ethyl butyrate to water was 1:1:1, and other three external conditions had little effects on the stability of emulsifier EL-35-ethyl butyrate-water system. β-carotene contained in liquid crystal was sensitive, but more stable to light at 25 ℃ than that inethyl butyrate solution and in microemulsion. pH value exhibited marked effects on the stability of the latter two, but little effecton that of the former. Therefore, liquid crystal presents a convenient and nontoxic vehicle for β-carotene in food industry.Key words:β-carotene;lytropic liquid crystal;preparation;stability
中图分类号:TS201.24 文献标识码:A 文章编号:1002-6630(2009)11-0011-06
溶致液晶是表面活性剂随浓度变化而生成的液晶,是分子有序组合体的一种形式,从结构上可分为层状、六角、立方等类型。由于其在生物工程、材料科学、日用化工等行业中的重要应用并显示其优良性能,如化妆品和洗涤剂中广泛应用的层状液晶[1-2]。溶致液晶的制备已引起人们的重视,相对于阴、阳离子表面活性剂来说,非离子表面活性剂生物降解性好,表面张力低,用于餐洗时泡沫低而且易清洗[3-4],应用前景极为广阔。
溶致液晶能够包结各种不同极性和剂量的物质,水
收稿日期:2008-09-17
基金项目:国家自然科学基金项目(20573048;20676051)
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