Abstract
A core consisting of nanoporous carbon (MNPC) and magnetized with Co3O4 was coated with a molecularly imprinted polymer (MIP) by atom transfer radical precipitation polymerization. Ethyl 3-coumarincarboxylate was used as a pseudo-template to give a MIP that has a fairly specific recognition capability for aflatoxins. Batch rebinding studies were carried out to determine the specific adsorption equilibrium and specific recognition. Extraction is achieved in a single step by mixing and vortexing the sample extract with the Co-MNPC@MIP. The loaded nanosorbent was then magnetically separated and eluted with acetonitrile/water (6/4, v/v). The aflatoxins were then quantified by HPLC. Under optimal conditions, the detection limits for aflatoxins typically are 0.05–0.07 ng mL−1, recoveries from spiked corn are found to be 75.1 to 99.4%, and relative standard deviations range from 1.7 to 5.1 (n = 6).
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Acknowledgments
The authors gratefully appreciate the financial support from the following research funds: National Natural Science Foundation of China (21575034, 51502079, 21577031, 21775140), the Fundamental Research Funds for the Henan Provincial Colleges and Universities in Henan University of Technology (2017RCJH10). We are especially indebted to Prof. Shi Bai from University of Delaware for helping to polish the language.
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Wu, C., He, J., Li, Y. et al. Solid-phase extraction of aflatoxins using a nanosorbent consisting of a magnetized nanoporous carbon core coated with a molecularly imprinted polymer. Microchim Acta 185, 515 (2018). https://doi.org/10.1007/s00604-018-3051-8
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DOI: https://doi.org/10.1007/s00604-018-3051-8