Issue 49, 2020, Issue in Progress

Synthesis of magnetic core–shell Fe3O4@PDA@Cu-MOFs composites for enrichment of microcystin-LR by MALDI-TOF MS analysis

Abstract

Microcystin-LR (MC-LR) is a toxin released from cyanobacteria in eutrophicated water. MC-LR is the most abundant and the most toxic among microcystins. In this work, core–shell structured copper-based magnetic metal–organic framework (Fe3O4@PDA@Cu-MOFs) composites were synthesized via a solvothermal reaction and a sol–gel method. The Fe3O4@PDA@Cu-MOFs composites showed ultra-high surface area, strong magnetic response and outstanding hydrophilicity. The Fe3O4@PDA@Cu-MOFs composites combined with matrix-assisted laser desorption/ionisation time-of-flight mass spectrometry (MALDI-TOF-MS) were used to analyse the content of MC-LR in real water samples. Under the optimised conditions, our proposed method exhibited good linearity within a concentration range of 0.05–4 μg L−1 and good detection even at low limits (0.015 μg L−1). The method was also successfully applied to analyse traces of MC-LR with quantitative recoveries for the real water samples in the range from 98.67% to 106.15%. Furthermore, it was characterized by high sensitivity, short operation time, being environmental friendly and having the ability to analyse other pollutants in the environment.

Graphical abstract: Synthesis of magnetic core–shell Fe3O4@PDA@Cu-MOFs composites for enrichment of microcystin-LR by MALDI-TOF MS analysis

Supplementary files

Article information

Article type
Paper
Submitted
08 May 2020
Accepted
06 Jul 2020
First published
05 Aug 2020
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2020,10, 29061-29067

Synthesis of magnetic core–shell Fe3O4@PDA@Cu-MOFs composites for enrichment of microcystin-LR by MALDI-TOF MS analysis

Z. Li, C. Gong, P. Huo, C. Deng and S. Pu, RSC Adv., 2020, 10, 29061 DOI: 10.1039/D0RA04125D

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