Selective detection for methomyl pesticide via catalytic chemosensing assay

Anxun ZHENG, Cheng-Bin GONG, Cheuk Fai Stephen CHOW

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1 Citation (Scopus)


The catalytic chemosensing assay (CCA), a new indicator displacement assay, is developed for selective detection of methomyl, a highly toxic pesticide. Herein, a trimetallic complex, {Feˡˡ(dmbpy)(CN)₄–[Ptˡˡ(DMSO)Cl]₂–Ruˡˡ(bpy)₂(CN)₂}, 1, (dmbpy = 4,4’‐dimethyl‐2,2’‐bipyridine and bpy = 2,2’‐bipyridine) is synthesized as a task‐specific catalyst to initially reduce and degrade methomyl into CH₃SH/CH₃NH₂/CH₃CN/CO₂. The thus‐produced CH₃SH interacts with the trimetallic complex to displace the luminophore, cis‐Ruˡˡ(bpy)₂(CN)₂, for monitoring. Other pesticides, including organophosphates and similar carbamate pesticides, remained intact under the same catalytic conditions; a selective sensing signal is only activated when 1 recognizes methomyl. Furthermore, 1 can be applied to detect methomyl in real water samples. According to the luminescent mode of the assay, the method detection limit (MDL) of 1 to methomyl (LD₅₀ = 17 mg/kg) was 1.12 mg/L. Copyright © 2020 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim.
Original languageEnglish
Pages (from-to)14461-14466
JournalChemistry: A European Journal
Issue number63
Early online dateJul 2020
Publication statusPublished - 11 Nov 2020


Zheng, A., Gong, C.-B., & Chow, C.-F. (2020). Selective detection for methomyl pesticide via catalytic chemosensing assay. Chemistry: A European Journal, 26(63), 14461-14466. doi: 10.1002/chem.202002882


  • Indicator displacement assay
  • Catalytic chemosensing assay
  • Chemosensing
  • Organophosphate pesticide
  • Chemodosimeter


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