Abstract：β-cyclodextrin(β-CD), a kind of cyclic oligosaccharides, was found to possess a strong inclusion ability with β-carotene. The inclusion compounds of β-CD with β-carotene were prepared by the coprecipitation method, and studied by UV-Vis spectra of different mole ratio β-CD/β-carotene in the H2O+ethanol solution (H2O for β-CD, and ethanol for β-carotene). Equilibrium constant of inclusion compound was determined by UV-Vis spectra. The results indicate that 3.25 moles of β-CD can include one mole β-carotene to form inclusion compound by Van der Waals force and hydrophobic interaction etc. The optimum synthesis conditions of inclusion compound of β-CD with β-carotene is that the mole ratio of β-CD/β-carotene is 3.25∶1(mol/mol), the concentration ratio of β-CD H2O solution/ β-carotene solution is 12∶1(mol·L-1/mol·L-1), and the time and temperature of inclusion reaction are 2 h and 30 ℃, respectively. Equilibrium constant of inclusion compound(Ka) is 9.46×1011 L·mol-1. The selective binding ability of β-CD with β-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 β-carotene were increased by inclusion with β-CD.
Key words：β-Cyclodextrin;β-Carotene;UV-Vis spectra;Inclusion reaction;Equilibrium constant of inclusion compound
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(09): 1099-1102.
FENG Guang-zhu，LU Kui，LI He-ping. Study on the Inclusion Complexation Interaction of β-Cyclodextrin and β-Carotene by UV-Vis Spectra . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2004, 24(09): 1099-1102.
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