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Issue 15, 2019
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Electrochemical sensing of cocaine in real samples based on electrodeposited biomimetic affinity ligands

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Abstract

A selective electrochemical sensor for direct detection of cocaine was developed based on molecularly imprinted polymers electropolymerized onto graphene-modified electrodes. Palladium nanoparticles were integrated in the sensing layer for the benefit of enhancing the communication between the imprinted sites and the electrode and improving their homogeneous distribution. The molecularly imprinted polymer was synthesized by cyclic voltammetry using p-aminobenzoic acid as a high affinity monomer selected by computational modeling, and cocaine as a template molecule. Experimental parameters related to the electrochemical deposition of palladium nanoparticles, pH, composition of the electropolymerization mixture, extraction and rebinding conditions were studied and optimized. Under optimized conditions, the oxidation peak current varied linearly with cocaine concentration in the range of 100–500 μM, with a detection limit of 50 μM (RSD 0.71%, n = 3). The molecularly imprinted sensor was able to detect cocaine in saliva and river water with good recoveries after sample pretreatment and was successfully applied for screening real street samples for cocaine.

Graphical abstract: Electrochemical sensing of cocaine in real samples based on electrodeposited biomimetic affinity ligands

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Publication details

The article was received on 06 Apr 2019, accepted on 08 Jun 2019 and first published on 10 Jun 2019


Article type: Paper
DOI: 10.1039/C9AN00618D
Analyst, 2019,144, 4639-4646

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    Electrochemical sensing of cocaine in real samples based on electrodeposited biomimetic affinity ligands

    A. Florea, T. Cowen, S. Piletsky and K. De Wael, Analyst, 2019, 144, 4639
    DOI: 10.1039/C9AN00618D

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