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
Affiliations
Raquel Garcia
MED—Mediterranean Institute for Agriculture, Environment and Development, Departamento de Fitotecnia, Escola de Ciências e Tecnologia da Universidade de Lisboa, Universidade de Évora, Pólo da Mitra, Apartado 94, 7006-554 Évora, Portugal
Elisabete P. Carreiro
Centro de Química de Évora, IIFA, Universidade de Évora, Colégio L.A. Verney, 7000 Évora, Portugal
João Carlos Lima
LAQV, REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
Marco Gomes da Silva
LAQV, REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
Ana Maria Costa Freitas
MED—Mediterranean Institute for Agriculture, Environment and Development, Departamento de Fitotecnia, Escola de Ciências e Tecnologia da Universidade de Lisboa, Universidade de Évora, Pólo da Mitra, Apartado 94, 7006-554 Évora, Portugal
Maria João Cabrita
MED—Mediterranean Institute for Agriculture, Environment and Development, Departamento de Fitotecnia, Escola de Ciências e Tecnologia da Universidade de Lisboa, Universidade de Évora, Pólo da Mitra, Apartado 94, 7006-554 Évora, Portugal
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).
