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/pre-concentration 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 (0.03 µg·mL−1).
Highlights
Pesticides are used worldwide to manage agricultural pests
The effect that some matrix components have on the suppression or enhancement of analyte ionization during their detection by mass spectrometry, which is well described in the literature, hampers an accurate quantification [1]
DR-molecularly imprinted polymer (MIP) and DR-NIP were obtained by the surface-imprinting technique, as depicted in Figure were obtained by the surface-imprinting technique, as depicted
Summary
Pesticides are used worldwide to manage agricultural pests. If the withdrawal period is not respected, they can persist until harvest time. The harmful effects for human health prompt the development of more sensitive and selective methodologies that enable an accurate quantification of pesticide residues in foodstuffs allowing to assess whether the maximum residue limits imposed by legislation are being met [1]. Even using the most advanced analytical techniques mainly based on chromatographic methods, direct injections of crude sample extracts are not a recommended practice. The effect that some matrix components have on the suppression or enhancement of analyte ionization during their detection by mass spectrometry, which is well described in the literature, hampers an accurate quantification [1]
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