Mimicking new receptors based on molecular imprinting and their application to potentiometric assessment of 2,4- dichlorophenol as a food taint

Abstract

Innovative host-tailored polymers were prepared, characterized and used as recognition elements in potentio- metric transducers for the selective quantification of 2,4-dichlorophenol (DCP).The polymer beads were syn- thesized using DCP as a template molecule, acrylamide (AM),methacrylic acid (MAA) and ethyl methacrylate (EMA) as functional monomers and divinylbenzene (DVB) and ethylene glycol dimethacrylate (EGDMA) as cross-linkers. The sensors were fabricated by the inclusion of MIPs in plasticized polyvinyl chloride (PVC) matrix. Response characteristics of the proposed sensors revealed anionic slopes of −59.2, −49.7 and −80.6 mV/decade with detection limits of 5.6 × 10−5,5.9 × 10−5 and 13.2 × 10−5 mol/L for MIP/AM/DVB, MIP/MAA/DVB and MIP/EMA/EGDMA membrane based sensors, respectively. Good selectivity was observed over common inorganic/organic anions. Validation of the assay method according to IUPAC recommendations was justified ensuring the synthesis of good reliable novel sensors for DCP determination. The method was successfully applied for routine analysis of food taint in fish and fish farms water samples.