Preparation of stoichiometric molecularly imprinted polymer coatings on magnetic particles for the selective extraction of auramine O from water

A novel magnetic molecularly imprinted polymers for the selective recognition of auramine O was rationally designed via screening from a library of non-imprinted polymers. A stoichiometric ratio of functional monomer (itaconic acid) and template molecule (auramine O) was found to be 1.5. Meanwhile, the synthesised SiO2 @Fe3 O4 was modified by 0.5 mol·L-1 hydrochloric acid to facilitate preparation of magnetic molecularly imprinted polymer particles. Adsorption experiments showed that the magnetic polymer particles exhibited good selectivity, recoveries and enrichment performance. The stoichiometric imprinted polymers have been employed for the selective preconcentration of auramine O from lake water sample. The high specificity of stoichiometric imprinted polymers was proved in the extraction of mixture solution of auramine O, auramine O hydrochloride and chrysoidine, and the recoveries ranging between 99.66% and 108.75% (RSD 2.6-3.7%, n = 3) for lake water. These results suggest that this method is effective and can be successfully applied to the analysis of auramine O in environmental water samples.

Yang W, Muhammad T, Yigaimu A, Muhammad K, Chen L. ; Full Source: Journal of Separation Science. 2018 Sep 19. doi: 10.1002/jssc.201800797. [Epub ahead of print]