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. 2019 Nov 13;11(11):1872.
doi: 10.3390/polym11111872.

An Investigation of the Intermolecular Interactions and Recognition Properties of Molecular Imprinted Polymers for Deltamethrin through Computational Strategies

Lei Xie  1 , Nan Xiao  1 , Lu Li  1 , Xinan Xie  1 , Yan Li  1
Affiliations

An Investigation of the Intermolecular Interactions and Recognition Properties of Molecular Imprinted Polymers for Deltamethrin through Computational Strategies

Lei Xie et al. Polymers (Basel). .

Abstract

Deltamethrin (DM) is a toxic pesticide that is nonetheless widely used to control insect pests in agricultural production. Although the number of DM molecularly imprinted polymers (MIPs) is increasing in many scientific applications, the theoretical aspects of the participating intramolecular forces are not fully understood. This paper aims to explore the intermolecular interactions between the template molecule DM and the functional monomer acrylamide (AM) through density functional theory (DFT), analysis of hydrogen nuclear magnetic resonance (1H-NMR), Fourier transform infrared spectroscopy (FTIR), and adsorption thermodynamics. The results indicated that there is strong hydrogen bonding between O19 of DM and H9 of AM, suggesting that it is the preferable site for the binding of the target molecule. The existence of interaction sites was found to play an important role in the recognition process. The results from selective adsorption experiments showed that the DM MIPs exhibited the highest adsorption capacity for DM (Q = 75.72 mg g-1) as compared to the five structural analogs. Furthermore, the recovery rates of spiked DM from various teas using the DM MIPs as solid-phase extraction filler also possessed a high value (all greater than 83.68%), which enables them to be used as separate and recognition functional materials.

Keywords: acrylamide; deltamethrin; density functional theory; intermolecular interaction; molecular imprinted polymer; recognition property.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Frontier molecular orbitals and energy levels for HOMO and LUMO of DM and AM.
Figure 2
Figure 2
Molecular electrostatic potentials of DM and AM.
Figure 3
Figure 3
F (−) functions of DM (a) and AM (b).
Figure 4
Figure 4
F (0) functions of DM (a) and AM (b).
Figure 5
Figure 5
F (+) functions of DM (a) and AM (b).
Figure 6
Figure 6
1H-NMR spectra of AM and DM–AM complex.
Figure 7
Figure 7
FT-IR spectra of AM, DM, and the DM–AM complex.
Figure 8
Figure 8
Solvation energy of DM and AM in different solvents.
Figure 9
Figure 9
Specific adsorption capacities of MIPs and NIPs with respect to DM, cypermethrin, lambda-cyhalothrin, and bifenthrin.
See this image and copyright information in PMC

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