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β-胡萝卜素微乳制剂的研究
The Study of β-Carotente Microemulsion Agentia
【作者】 颜秀花；
【导师】 王正武；
【作者基本信息】 江南大学 ， 应用化学， 2008， 硕士
【摘要】 应用DFT-B3LYP/6-31G*方法计算所得的17种常用溶剂分子结构单元的物性参数,对β-胡萝卜素溶解性能做定量结构性质(QSPR)研究。制备了以Tween80为表面活性剂、丁酸乙酯为油相(无毒,对β-胡萝卜素的溶解度比较大)、乙醇为助表面活性剂的O/W型β-胡萝卜素的微乳液,考察了温度、盐度、pH和防腐剂对微乳区域的影响:电导率法区分了微乳液的O/W、W/O和B.C.区域;对相同浓度β-胡萝卜素的微乳液和丁酸乙酯溶液进行了光、热稳定性研究,用紫外分光光度法测定样品中β-胡萝卜素的残存率;用流变仪和动态光散射的方法研究了空白微乳和含β-胡萝卜素微乳液的微结构。β-胡萝卜素溶解定性研究表明:采用多元线性回归法构建QSPR模型,所得模型线性相关性好,具有较好的预测能力;β-胡萝卜素在一些溶剂中的溶解度大小次序为:四氢呋喃>丁酸乙酯>正己烷>异丙醇。微乳体系研究表明:温度升高和pH值降低使微乳区稍有减小,盐度、防腐剂对微乳区基本无影响;微乳体系中水的质量分数大于61.5%时形成O/W型微乳液;β-胡萝卜素在微乳液和丁酸乙酯溶液中对光和热都比较敏感,但在微乳液中较稳定;β-胡萝卜素加入明显的影响微乳液的微结构,加入β-胡萝卜素使微乳液的W/O区域变小, B.C.和O/W区域变大;同样的,含β-胡萝卜素微乳液的粒径较空白微乳大,含β-胡萝卜素微乳液的粒径同空白微乳液一样,在储藏初期逐渐减小,三天后,开始基本不变,且在一个月内稳定。各种影响因素表明,β-胡萝卜素最好低温避光保存。本文开展了以下创新性工作1.应用DFT-B3LYP/6-31G*方法计算所得的17种常用溶剂分子结构单元的物性参数,对β-胡萝卜素溶解性能做定量结构性质(QSPR)研究。采用多元线性回归法构建QSPR模型,所得模型线性相关性好,对β-胡萝卜素在不同溶剂中的溶解度具有较好的预测能力,为实验节省了大量时间和经费。2.以非离子表面活性剂得到了包封食品强化剂β-胡萝卜素的微乳液载体,并将β-胡萝卜素包封在微乳液中,解决了β-胡萝卜素的水溶性和易被氧化等不稳定性的问题,且工艺简单,成本低。3.制得的β-胡萝卜素微乳液的粒径在80nm左右,易于被人体吸收,增强了β-胡萝卜素生物利用度。
【Abstract】 The density functional theory method at the B3LYP/6-31G* level were carried out for calculating the physiochemical parameters of the structural units of 17 familiar solvents, which were used to investigated the quantitative structure property relationship(QSPR)of the solubility ofβ-carotene.Microemulsion systems which were used to envelopβ-Carotente were prepared. A microemulsion containing Tween80, ethanol and ethyl butyrate was developed to envelopβ-Carotene with psedu-ternary phase diagram; The O/W, W/O and B.C. regions were divided with conductance method, the influences of temperature, salinity, pH as well as preservative on the microemulsion regions were also considered;The viscosity and the particle sizes variation in two systems of empty microemulsion and that containingβ-Carotene have been investigated; The effects of sunlight, temperature and pH on the stability ofβ-Carotene were comparatively studied both in microemulsion and in ethyl butyrate solution.Results of quantum chemistry calculation showed:The best fitted QSPR model obtained has good correlation, small standard deviation and can forecast the solubilities ofβ-carotene in unknown solvents simply and quickly;The solubilizing capacity ofβ-carotene in these solvents: THF > ethyl butyrate > Hexane > 2-propanol.Study of microemulsion showed that O/W microemulsion formed when water weight content was above 61.5% in the mixture; The microemulsion regions decreased slightly with the increase of temperature and the decrease of pH; Salinity and preservative had hardly influences on the microemulsion regions. Thatβ-carotene affected obviously the mesophases curvature and advanced the formation of B.C., and thus enlarged the bicontinuous and O/W regions; DLS showed that the droplets in microemulsion containingβ-Carotene, as well as, in empty microemulsion prepared after 3 days shrunk sharply, then kept remarkable stability even after a month; The figure showed that theβ-Carotene was much more consumed in the sunlight and high temperature, Which denoted that sunlight and high temperature had obviously influences on the stability ofβ-Carotene both in microemulsion and in ethyl butyrate solution; Theβ-Carotene contained in the microemulsion, compared with in ethyl butyrate solution, was much more stable. The test of influencing factors indicated that theβ-carotene microemulsion should be preserved at room temperature and avoided light.Some jobs were created in this work, envelopedβ-Carotene in microemulsions, madeβ-Carotene not to be easily oxidized and have good stability.1. The density functional theory method at the B3LYP/6-31G* level were carried out for calculating the physiochemical parameters of the structural units of 17 familiar solvents, which were used to investigated the quantitative structure propert relationship (QSPR) of the solubility ofβ-carotene. The best fitted QSPR model obtained has good correlation, small standard deviation and can forecast the solubilities ofβ-carotene in unknown solvents simply and quickly.2. The O/W microemulsion to envelopβ-Carotene was formed steadily, which changedβ-Carotene into water-soluble liquid in water and not being easily oxidized in atmosphere, light or temperature.3. The diameters ofβ-Carotene microemulsions were around 80nm, which was also believed to enhance its bioavailability.