光谱学与光谱分析 |
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Study on Molecular Recognition of Cucurbit[6]uril with Oxytetracycline Molecules by Spectroscopic Methods |
YAN Kun1, 2, WANG Ping1, LIU Yun2*, DONG Yuan-hua2 |
1. School of Chemistry & Biological, Lanzhou Jiaotong University, Lanzhou 730070, China 2. Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China |
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Abstract The molecular recognition of Cucurbit[6]uril (CB[6]) with Oxytetracycline (OTC) was studied by fluorescence spectra and UV spectra. The results showed that the fluorescence intensity and the UV absorbance of OTC were enhanced as host molecules were added, which showed that CB[6] and OTC were interacted. The inclusion of OTC was detected by fluorescence spectra and UV spectra with an apparent 1∶1 interaction, which was also observed through the Benesi-Hildebrand method, OTC can form 1∶1 complex with CB[6] under acid condition and it can not form complex with CB[6] under basic condition. The thermodynamic parameters (stability constants Ks, Gibbs free energy change ΔG, enthalpy change, and entropy change) for the complexation process were determined. The thermodynamic studies indicated that the inclusion reactions between CB[6] and OTC were the hydrophobic interaction and endothermic process.
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Received: 2016-01-18
Accepted: 2016-05-12
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Corresponding Authors:
LIU Yun
E-mail: yliu@issas.ac.cn
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