Abstract
A theoretical study on the interaction of the ractopamine (RAC) with functional monomers in the formation of imprinted polymers was investigated by means of quantum chemical calculations. In the present work, all structural optimization, interaction energies calculations and solvent effects were performed using density functional theory (DFT) method. The obtained data from five systems were used to evaluate the ability to form non-covalently bonded monomer–template complexes under vacuum and the different solvents conditions. These systems were presented by the following monomers: acrylic acid (AA), methacrylic acid (MAA), trifluoromethylacrylic acid (TFMAA), acrylamide (AAm) and methylacrylamide (MAAm). The solvent effects of pre-polymerization were considered using the solvation model based on density (SMD) in five solvents (toluene, chloroform, methanol, acetonitrile and dimethyl sulphoxide (DMSO) in this work. The results were evaluated through the solvation energy and the reaction energetics. Computer simulation of the interaction between the ractopamine and functional monomers indicated that although TFMAA has a strong interaction with the template in comparison to other complex forms in gas phase; it possesses non-specific interaction with the ractopamine molecule in solution. Moreover, MAAm was suitable for imprinting ractopamine, because the strongest interaction occurred between ractopamine and MAAm with a polymerization ratio of 1:4 in DMSO. The values of ΔG and ΔE were 26.30 and 40.51 kcal mol−1, respectively. This work may be useful for providing information for the choice of suitable functional monomer and proper solvent in the preparation of RAC molecularly imprinted polymers.
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (31601549, U1507115 and 21605061), the Natural Science of Jiangsu Province (BK20161362), the Natural Science Fund for Colleges and Universities in Jiangsu Province (16KJB150045), China Postdoctoral Science Foundation (2016M601747) and was sponsored by Qing Lan Project of the Higher Education Institutions of Jiangsu Province.
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Wu, H., Li, X., Meng, S. et al. A comprehensive theoretical study of structural optimization, interaction energies calculations and solvent effects between ractopamine and functional monomers in molecular imprinting polymers. Polym. Bull. 75, 1981–1996 (2018). https://doi.org/10.1007/s00289-017-2140-x
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DOI: https://doi.org/10.1007/s00289-017-2140-x