Electrochemical sensing using magnetic molecularly imprinted polymer particles previously captured by a magneto-sensor

Publication date: 1 May 2018
Source:Talanta, Volume 181
Author(s): Gerson A. Ruiz-Córdova, Sabir Khan, Luís Moreira Gonçalves, Maria Isabel Pividori, Gino Picasso, Maria Del Pilar T. Sotomayor
The determination of 1-chloro-2,4-dinitrobenzene (CDNB) was used as a proof-of-concept to a simple analytical practical configuration applying magnetic molecularly imprinted particles (mag-MIPs). Mag-MIPs were captured from an emulsion by a home-made magneto-sensor (where a small magnet was entrapped by a graphite-epoxy composite) and then, this sensor, was transferred to the solution containing the analyte, where, after binding to the mag-MIPs, the analyte was directly analysed using differential pulse voltammetry (DPV) since the magneto-sensor acted as the working electrode. After optimization, a detection limit of 6.0 μmol L⁻¹ with a RSD of 2.7% was achieved along with suitable recoveries and selectivity. This methodology offers a different approach for electroanalytical methodologies using mag-MIPs.

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