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紫外-可见光谱研究β-环糊精与β-胡萝卜素的包结作用
引用本文:冯光炷,卢奎,李和平.紫外-可见光谱研究β-环糊精与β-胡萝卜素的包结作用[J].光谱学与光谱分析,2004,24(9):1099-1102.
作者姓名:冯光炷  卢奎  李和平
作者单位:郑州工程学院化学化工系,河南,郑州,450052
摘    要:用紫外 可见光谱研究了 β 环糊精与 β 胡萝卜素的包结作用 ,结果表明 ,3 2 5个 β 环糊精分子与 1个分子 β 胡萝卜素依据范德瓦尔斯作用力和疏水作用力发生包结作用 ,生成稳定的包结物 ,包结物和 β 环糊精的红外光谱也显示包结物的形成和存在。包结物适宜的制备条件为 :β 环糊精与 β 胡萝卜素的摩尔比为 3 2 5∶1,主客体溶液的浓度比为 12∶1;包结温度 30℃ ;反应时间 2h。用可见 紫外光谱测定的包结物的包结常数为 9 4 6× 10 11L·mol-1,包结物稳定。对包结作用的动力学特性和包结物的分子构像进行了探讨

关 键 词:β-环糊精  β-胡萝卜素  紫外-可见光谱  包结作用  包结常数
文章编号:1000-0593(2004)09-1099-04
修稿时间:2003年8月20日

Study on the Inclusion Complexation Interaction of β-Cyclodextrin and β-Carotene by UV-Vis Spectra
FENG Guang-zhu,LU Kui,LI He-ping.Study on the Inclusion Complexation Interaction of β-Cyclodextrin and β-Carotene by UV-Vis Spectra[J].Spectroscopy and Spectral Analysis,2004,24(9):1099-1102.
Authors:FENG Guang-zhu  LU Kui  LI He-ping
Institution:Department of Chemistry and Chemical Engineering, Zhengzhou Institute of Technology, Zhengzhou 450052, China.
Abstract:Beta-cyclodextrin (beta-CD), a kind of cyclic oligosaccharides, was found to possess a strong inclusion ability with beta-carotene. The inclusion compounds of beta-CD with beta-carotene were prepared by the coprecipitation method, and studied by UV-Vis spectra of different mole ratio beta-CD/beta-carotene in the H2O+ ethanol solution (H2O for beta-CD, and ethanol for beta-carotene). Equilibrium constant of inclusion compound was determined by UV-Vis spectra. The results indicate that 3.25 moles of beta-CD can include one mole beta-carotene to form inclusion compound by Van der Waals force and hydrophobic interaction etc. The optimum synthesis conditions of inclusion compound of beta-CD with beta-carotene is that the mole ratio of beta-CD/beta-carotene is 3.25:1 (mol/mol), the concentration ratio of beta-CD H2O solution/beta-carotene solution is 12:1 (mol x L(-1)/mol x L(-1)), and the time and temperature of inclusion reaction are 2 h and 30 degrees C, respectively. Equilibrium constant of inclusion compound (Ka) is 9.46 x 10(11) L x mol(-1). The selective binding ability of beta-CD with beta-carotene has been discussed from the viewpoint of size/shape-fitting and geometry fitting between the host cavity and the guest molecule. The resistance to oxidation and photooxidation, and the solubility in H2O of beta-carotene were increased by inclusion with beta-CD.
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