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Molecularly imprinted polyaniline molecular receptor–based chemical sensor for the electrochemical determination of melamine
Author(s) -
Regasa Melkamu B.,
Soreta Tesfaye R.,
Femi Olu E.,
Ramamurthy Praveen C.,
Kumar Saravana
Publication year - 2020
Publication title -
journal of molecular recognition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.401
H-Index - 79
eISSN - 1099-1352
pISSN - 0952-3499
DOI - 10.1002/jmr.2836
Subject(s) - molecularly imprinted polymer , melamine , detection limit , electrochemical gas sensor , polyaniline , cyclic voltammetry , materials science , repeatability , analyte , molecular imprinting , voltammetry , selectivity , electrode , chromatography , electrochemistry , analytical chemistry (journal) , chemistry , polymer , organic chemistry , polymerization , catalysis , composite material
Molecularly imprinted polymer‐modified glassy carbon electrode (GCE)‐based electrochemical sensor is prepared using the electropolymerization of aniline in the presence of melamine (MA) as a template. In this work, the advantages of molecularly imprinted conducting polymers (MICPs) and electroanalytical methods were combined to obtain an electronic device with better performances. The sensor performance was evaluated by cyclic voltammetry (CV) and square wave voltammetry (SWV) with the linear range of 0.6‐16 × 10 −9 M, quantification limit of 14.9 × 10 −10 M, and detection limit of 4.47 × 10 −10 M (S/N = 3). The selectivity of the sensor was tested in the presence of acetoguanamine (AGA), diaminomethylatrazine (DMT), casein, histidine, and glycine interfering molecules taken at the triple concentration with MA that demonstrated too small current response compared with that of the analyte indicating high specificity of the sensor towards the template. The sensor was successfully applied to determine MA in infant formula samples with significant recovery greater than 96% and relative standard deviation (RSD) less than 4.8%. Moreover, the good repeatability, recyclability, and stability make this sensor device promising for the real‐time monitoring of MA in different food stuffs.