文摘
A novel molecularly imprinted material based on silica microparticles was synthesized by surface polymerization?with 3-chloro-1,2-propandiol (3-MCPD) as a template molecule. The molecularly imprinted polymer (MIP) was characterized by infrared spectroscopy and scanning electron microscopy. The adsorption of 3-MCPD by MIP was measured by gas chromatography with electron capture detection (GC-ECD) and an equilibrium binding experiment. Scatchard analysis revealed that the maximum apparent binding capacities of the MIP and non-imprinted polymer (NIP) were 67.64 and 23.31?μmol/g, respectively. The new adsorbent was successfully used in solid-phase extraction (SPE) to selectively enrich and determine 3-MCPD in soy sauce samples. The MIP-SPE column achieves recoveries higher than 92.7?% with a relative standard deviation of less than 1.83?%. The MIP-SPE-GC protocol improved the selectivity and eliminated the effects of template leakage on quantitative analysis and could be used for the determination of 3-MCPD in other complex food samples. Graphical Abstract The MIP-SPE column developed by us achieves recoveries higher than 92.7 % with a relative standard deviation of less than 1.83 % for determining the 3-MCPD in the soy sauce matrix (mixed with 3-MCPD, 2-MPCD and 1,3-DCP).