Solid-phase extraction of aflatoxins using a nanosorbent consisting of a magnetized nanoporous carbon core coated with a molecularly imprinted polymer

A core consisting of nanoporous carbon (MNPC) and magnetized with Co 3 O 4 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 capab...

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Veröffentlicht in:Mikrochimica acta (1966) 2018-11, Vol.185 (11), p.515-11, Article 515
Hauptverfasser: Wu, Chaojun, He, Juan, Li, Yuanyuan, Chen, Ningning, Huang, Zhipeng, You, Liqin, He, Lijun, Zhang, Shusheng
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Sprache:eng
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Zusammenfassung:A core consisting of nanoporous carbon (MNPC) and magnetized with Co 3 O 4 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). Graphical abstract Poly(methacrylic acid) was imprinted with the pseudo-template ethyl 3-coumarincarboxylate by atom transfer radical precipitation polymerization on the surface of cobalt-derived magnetic nanoporous carbon (Co-MNPC). This nanosorbent was used for the magnetic solid phase extraction of aflatoxins, followed by HPLC analysis.
ISSN:0026-3672
1436-5073
DOI:10.1007/s00604-018-3051-8