Molecularly Imprinted Polymers for Gossypol via Sol–Gel, Bulk, and Surface Layer Imprinting—A Comparative Study
by
Lulu Wang 1,2, Keke Zhi 1,2, Yagang Zhang 1,2,3,*
, Yanxia Liu 1,2, Letao Zhang 1,2, Akram Yasin 1,2 and Qifeng Lin 4
Lulu Wang 1,2, Keke Zhi 1,2, Yagang Zhang 1,2,3,*, Yanxia Liu 1,2, Letao Zhang 1,2, Akram Yasin 1,2 and Qifeng Lin 4
1
Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi 830011, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
3
Department of Chemical and Environmental Engineering, Xinjiang Institute of Engineering, Urumqi 830026, China
4
Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China
*
Author to whom correspondence should be addressed.
Polymers 2019, 11(4), 602; https://doi.org/10.3390/polym11040602
Received: 18 February 2019 / Revised: 23 March 2019 / Accepted: 24 March 2019 / Published: 2 April 2019
(This article belongs to the Special Issue Biomimicry through Molecular Imprinting: From Polymer Design to Devices)
Three gossypol molecularly imprinted polymers (MIPs) were prepared by bulk polymerization (MIP1), surface layer imprinting using silica gel as the support (MIP2), and the sol-gel process (MIP3). The as-prepared MIPs were characterized by SEM and nitrogen adsorption−desorption techniques to study the morphology structure. The adsorption experiments exhibited that MIP1 had adsorption capacity as high as 564 mg·g−1. The MIP2 showed faster adsorption kinetics than MIP1 and MIP3. The adsorption equilibrium could be reached for gossypol in 40 min. A selectivity study showed that the adsorption capacity of MIPs for gossypol was about 1.9 times higher than that of the structurally-similar analogs ellagic acid and 6.6 times higher than that of the quercetin. It was found that the pseudo-second-order kinetic model and the Freundlich isotherm model were more applicable for the adsorption kinetics and adsorption isotherm of gossypol binding onto the MIP1 and MIP2, respectively. Results suggested that among those three, the MIP2 was a desirable sorbent for rapid adsorption and MIP1 was suitable for selective recognition of gossypol.
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Keywords:
gossypol; bulk polymerization; sol–gel surface imprinting; adsorption kinetics; adsorption isotherms; adsorption selectivity
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited
MDPI and ACS Style
Wang, L.; Zhi, K.; Zhang, Y.; Liu, Y.; Zhang, L.; Yasin, A.; Lin, Q. Molecularly Imprinted Polymers for Gossypol via Sol–Gel, Bulk, and Surface Layer Imprinting—A Comparative Study. Polymers 2019, 11, 602.
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