Assessment of dimethoate in olive oil samples using a dual responsive molecularly imprinting-based approach

Raquel Garcia, Elisabete P. Carreiro, João Carlos Lima, Marco Gomes da Silva, Ana Maria Costa Freitas, Maria João Cabrita

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Abstract

A new generation of advanced materials developed by molecular imprinting technology showing a stimuli-responsive functionality are emerging. The switchable ability to control the uptake/release of the target analyte by action of external stimulus combined with a remarkable selectivity and specificity, makes these functional materials very attractive for sample preparation purposes. In this work, the usefulness of a sample preparation tool for the selective enrichment/preconcentration of dimethoate from olive oil spiked samples based on “tailor-made” dual responsive magnetic and photonic molecularly imprinted polymers as sorbents is explored. To achieve this goal, a smart molecularly imprinted polymer (MIP) possessing magnetic and photonic responsiveness was successfully synthesized, and its physico-chemical and morphological characterization was assessed. Further, the trace analysis of dimethoate in spiked olive oil samples was validated and successfully implemented using smart-MIPs as sorbents in the sample preparation step, with high recoveries (83.5 ± 0.3%) and low detection limit (0.03µg·mL−1).

Original languageEnglish
Article number618
JournalFoods
Volume9
Issue number5
DOIs
Publication statusPublished - May 2020

Keywords

  • Dimethoate
  • Magnetic responsiveness
  • Molecularly imprinted polymers
  • Olive oil
  • Photonic responsiveness

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