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A simple, sensitive and efficient electrochemical platform based on carbon paste electrode modified with Fe3O4@MIP and graphene oxide for folic acid determination in different matrices by Sara Manente Garcia; Ademar Wong; Sabir Khan; Maria D.P.T. Sotomayor is a Chemistry article available to read on EtoBox.

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A new biomimetic sensor selective to folic acid based on a carbon paste modified with graphene oxide and Fe 3 O 4 nanoparticles coated with molecularly imprinted polymer in the core@shell format (Fe 3 O 4 @MIPs) was obtained using the polyol method. The sensing phase was synthesized in a simple way and characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and Brunauer-Emmett-Teller (BET) surface area. In the binding experiments the selective material showed a high adsorption capacity (Q) of 30.4 mg g -1 for MMIP, while the Q value for MNIP (magnetic non-imprinted polymer) was 15.3 mg g -1 both of them following the Langmuir model to the adsorption procedure. After their efficiency was proven, these materials were used as modifiers in the electrochemical sensor (Fe 3 O 4 @MIP-GO/CPE). Under optimized conditions using the square-wave adsorptive voltammetry, the proposed sensor exhibited excellent response with a concentration linear range between 2.5 and 48 μmol L -1 and limit of detection of 0.65 μmol L -1 (S/σ = 3). The advantages obtained with the proposed method were high robustness, selectivity, and low cost being these characteristi

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Author

Sara Manente Garcia; Ademar Wong; Sabir Khan; Maria D.P.T. Sotomayor

Publisher

Elsevier BV

Published

2021

Language

EN

Field

Chemistry (Physical Sciences)