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Abstract: Magnetic molecularly imprinted polymers (M-MIPs) were synthesized as the sorbents for extracting hexamethylenetetramine (HMT) from milk samples. Molecular simulations were used to calculate the interaction energies of the template monomers. The physical properties of M-MIPs were characterized. The adsorption isotherms and kinetics were investigated. Gas chromatography coupled with tandem mass spectrometry (GC-MS/MS) was applied to determine the amount of HMT residue in milk samples. In the optimized method, a linear calibration curve was obtained using a matrix-matched standard in the range of 1.0 - 50.0 μg L-1. The limit of detection (LOD) and limit of quantification (LOQ) was 0.3 μg kg-1 and 1.0 μg kg-1, respectively. The relative standard deviation (RSD) of the intra-day assay ranged from 2.6% to 5.2%, while that of the inter-day assay ranged from 3.6% to 11.5%. The recovery of HMT in milk samples ranged from 88.7% to 111.4%
Template and target information: hexamethylenetetramine, HMT
Author keywords: Hexamethylenetetramine, Magnetic molecularly imprinted polymers, Magnetic solid phase extraction, milk, GC-MS, MS