Melamine Recognition: Molecularly Imprinted Polymer for Selective and Sensitive Determination of Melamine in Food...

In this study, a sensitive and selective sensor is constructed to measure the melamine (MEL) using molecular imprinting polymer (MIP) technique. Chemical and electrochemical techniques are used to construct the MIP and quantitative measurements. The constructed sensor was modified with GO-Fe₃O₄@SiO₂ nanocomposite. Screening and optimization of factors are done using statistical methods, including Plackett-Burman design (PBD) and central composite design (CCD). Under the optimized conditions, an MIP sensor showed a linear range from 5.0 × 10^-7 to 1.0 × 10^-5 M MEL concentration with a correlation coefficient (R ²) of 0.9997. The limit of detection was obtained (0.028 µM) with a highly reproducible response (RSD 2.15%, n = 4). The electrochemical sensor showed good results for the determination of MEL in food samples.