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A magnetic polymer was molecularly imprinted with hippuric acid (HA) to obtain a nanomaterial with an architecture of type Fe3O4@SiO2@MIP. It was used as a sorbent for magnetic solid phase extraction of HA and methylhippuric acids (2-MHA, 3-MHA, 4-MHA) from urine samples. The respective imprinting factor are 4.6, 2.7, 2.0 and 1.8, respectively, and the selectivity coefficients are 1.7, 2.3 and 2.6...
A magnetite@graphene oxide nanocomposite was first coated with polyethylenimine and then modified with phytic acid and titanium(IV) ions. The high loading with Ti(IV) and the good hydrophilicity of PEI and PA result in a material that can be applied to the efficient extraction of highly polar nucleobases, nucleosides and nucleotides. The physicochemical properties of the composite were investigated...
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