MIP-capped terbium MOF-76 for the selective fluorometric detection of cefixime after its preconcentration with magnetic graphene oxide

Add time:08/01/2019    Source:sciencedirect.com

Herein, a sensitive and reliable fluorometric probe based on the molecular imprinted polymer capped terbium metal-organic frameworks ([email protected]) was introduced for the measurement of cefixime. The [email protected] composite was prepared by simple co-polymerization of definite monomers and cross-linkers in the presence of TbMOF-76 as support and cefixime as the model template molecules. After the removing of template molecules, the obtained composite had an intense fluorescence emission corresponding to the terbium emission spectra which undergo a sensible diminution in the presence of cefixime. The prepared [email protected] indicated a great affinity to adsorb cefixime molecules, which could linearly quench the emission intensity. Moreover, an extraction process using magnetic Fe3O4@SiO2 modified graphene oxide (Fe3O4/GO) was applied for the efficient preconcentration of cefixime from aqueous solution to access its very low concentrations. Based on this procedure, an ultrasensitive and selective probe was designed for cefixime. After optimization of key factors, a calibration graph was achieved in the concentration range of 0.8–90 ng mL−1 cefixime, with a detection limit (3 s) of 0.34 ng mL−1. The developed probe had a good precision (RSD% < 3.6) and was acceptably used for the determination of cefixime in pharmaceutical and human urine samples.

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