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  • Title: Fluorescence assay of oxytetracycline in seawater after selective capture using magnetic molecularly imprinted nanoparticles.
    Author: Zhao M, Wang J, Lian Z.
    Journal: Mar Pollut Bull; 2021 Feb; 163():111962. PubMed ID: 33444998.
    Abstract:
    A comprehensive strategy for manufacturing a novel sorbent based on magnetic molecularly imprinted polymers (MMIPs) is addressed for selective capture of oxytetracycline from seawater. The novel MMIPs were synthesized by nano-Fe3O4 as sacrificial matrix and adsorption properties of the polymers demonstrate rapid adsorption kinetics, high adsorption capacity, and specificity towards oxytetracycline provided by the core-shell composite structure. After screening the critical parameters by multivariate optimization, a magnetic imprinting solid phase extraction method combined with fluorescence spectrophotometry (MMIP-SPE-FL) was constructed for sensitive determination of oxytetracycline in seawater samples. The results show a good linear response dependence on the spiking concentration of 3-100 μg L-1, and a satisfactory limit of detection of 0.7 μg L-1 after the MMIP-SPE preconcentration. Seven seawater samples from Jiaozhou bay were analyzed to give recoveries in the range of 89.75-107.65% with relative standard deviation values of less than 5.44% (n = 3).
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