Abstract
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.
Highlights
Gossypol is a toxic compound indigenous to the seeds of cotton plants
Three sets of molecularly imprinted polymers (MIPs) for gossypol were prepared by bulk polymerization (MIP1), sol-gel surface layer imprinting (MIP2), and a sol−gel process (MIP3)
The obtained MIP2 and MIP3 exhibited faster adsorption kinetics towards gossypol compared with MIP1
Summary
Gossypol is a toxic compound indigenous to the seeds of cotton plants. Free gossypol can cause antifertility effects, growth depression, and other side effects in mammals [1,2,3,4,5]. As a by-product of the cotton industry, cottonseeds have become important feed resources because of their high nutritional quality. China is the second largest cotton producer in the world. Cottonseed meal is an important source of high-quality yet inexpensive protein feed for animal husbandry and aquaculture. Its application is limited due to the presence of toxic gossypol in cottonseed. Discovering methods for detoxifying gossypol in cottonseed related products have become an urgent task
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