A hollow visible-light-responsive surface molecularly imprinted polymer for the detection of chlorpyrifos in vegetables and fruits

Mei-jun CHEN, Hai-lin YANG, Ya-min SI, Qian TANG, Cheuk Fai Stephen CHOW, Cheng-bin GONG

Research output: Contribution to journalArticlespeer-review

Abstract

A visible-light-responsive azobenzene derivative, 3,5-dichloro-4-((2,6-dichloro-4-(methacryloyloxy)phenyl)diazenyl)benzoic acid, was synthesized and used as the functional monomer to fabricate a visible-light-responsive core-shell structured surface molecularly imprinted polymer (PS-co-PMAA@VSMIP). After removal of the sacrificial PS-co-PMAA core, a hollow structured surface molecularly imprinted polymer (HVSMIP) was obtained. Both the PS-co-PMAA@VSMIP and HVSMIP were used for the detection of chlorpyrifos, a moderately toxic organophosphate pesticide. They exhibited good visible-light-responsive properties (550 nm for trans→cis and 440 nm for cis→trans isomerization for an azobenzene chromophore) in ethanol/water (9:1, v/v). Compared with the PS-co-PMAA@VSMIP, the HVSMIP had a larger surface area, pore volume, binding capacity, imprinting effect, maximum chemical binding capacity, dissociation constant, and photo-isomerization rate. The HVSMIP was applied to detect trace chlorpyrifos in fruit and vegetable samples. This was achieved by measuring the trans→cis rate constant of the HVSMIP in the sample solution, with good recoveries, low relative standard deviations, and a low detection limit. Copyright © 2021 Elsevier Ltd. All rights reserved.
Original languageEnglish
Article number129656
JournalFood Chemistry
Early online date23 Mar 2021
DOIs
Publication statusE-pub ahead of print - 23 Mar 2021

Citation

Chen, M.-J., Yang, H.-L., Si, Y.-M., Tang, Q., Chow, C.-F., & Gong, C.-B. (2021). A hollow visible-light-responsive surface molecularly imprinted polymer for the detection of chlorpyrifos in vegetables and fruits. Food Chemistry. Advance online publication. doi: 10.1016/j.foodchem.2021.129656

Keywords

  • Surface imprinting technique
  • Molecularly imprinted polymer
  • Chlorpyrifos
  • Visible-light-responsive material
  • Pesticide residue
  • Food safety

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