Abstract:A novel method (magnetic surface molecular imprinting technique) for the detection of Sudan I in food was investigated. A silica-wrapped magnetic nanoparticle was utilized as the carrier and on its surface the magnetic surface molecular imprinted polymer was synthesized. The magnetic properties, morphological features, adsorption properties, and specificities of the prepared Sudan I magnetic molecularly imprinted polymers were determined by ultraviolet (UV) spectrophotometry, infrared (IR) spectrometry, and transmission electron microscopy. The results showed that the imprinted sites of the magnetic surface imprinted polymer were located on the surface of the magnetic carrier, and the binding capacity with the target substance was shown to be improved. With the presence of an external magnetic field, the magnetic surface molecularly imprinted polymers easily reached adsorption equilibrium, magnetic separation was achieved, and nonspecific adsorption was reduced, thus improving the adsorption and selectivity capacity for Sudan I. Furthermore, the recovery of Sudan I in pepper was measured to be more than 80%, indicating that the magnetic surface molecular imprinting technique can be used as a novel method for the rapid and efficient detection of Sudan I in food.
