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  • Title: Core-shell-structured magnetic covalent organic frameworks for effective extraction of parabens prior to their determination by HPLC.
    Author: Yang XS, Zhao J, Wang LL, Liu YS, Liu QW, Peng XY, Wang P.
    Journal: Mikrochim Acta; 2022 Aug 23; 189(9):340. PubMed ID: 35995957.
    Abstract:
    Covalent organic framework (COF)-decorated magnetic nanoparticles (Fe3O4@DhaTab) with core-shell structure have been synthesized by one-pot method. The prepared Fe3O4@DhaTab was well characterized, and parameters of magnetic solid-phase extraction (MSPE) for parabens were also investigated in detail. Under optimized conditions, the adsorbent dosage was only 3 mg and extraction time was 10 min. The developed Fe3O4@DhaTab-based MSPE-HPLC analysis method offered good linearity (0.01-20 μg mL-1) with R2 (0.999) and low limits of detection (3.3-6.5 μg L-1) using UV detector at 254 nm. The proposed method was applied to determine four parabens in environmental water samples with recoveries in the range 64.0-105% and relative standard deviations of 0.16-7.8%. The adsorption mechanism was explored and indicated that porous DhaTab shell provided π-π, hydrophobic, and hydrogen bonding interactions in the MSPE process. The results revealed the potential of magnetic-functionalized COFs in determination of environmental contaminants.
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