Issue 5, 2023

A 3D carbon black disposable electrochemical sensor modified with reduced graphene oxide used for the sensitive determination of levofloxacin

Abstract

In this work, a simple method for the fabrication of an electrochemical sensor using a conductive carbon black and polylactic acid-based filament (3D-CB/PLA) printed with a 3D-pen is presented. The sensor was later modified with reduced graphene oxide (rGO), and for the first time was used for monitoring levofloxacin (LEV) in pharmaceutical formulations, synthetic urine, and tap water samples by differential pulse voltammetry (DPV). The characterization by scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV) demonstrated that the electroanalytical performance of the modified sensor compared to the unmodified electrode was increased 3.7-fold, moreover an anticipation of the LEV oxidation potential by 120 mV was observed, which characterizes the electrocatalytic effect promoted by the rGO nanosheets attached on the 3D-printed carbon black surface. Additionally, the proposed method presented a linear working range from 10 to 50 μmol L−1 and a detection limit of 2.17 μmol L−1. Moreover, excellent precision (RSD < 6.5%) and accuracy with recovery for spiked samples ranging from 95.4 to 104.8% were obtained. The sensor was also selective against the main antibiotics reported in the literature. Therefore, it can be claimed that 3D printed devices are promising for implementation in routine methods.

Graphical abstract: A 3D carbon black disposable electrochemical sensor modified with reduced graphene oxide used for the sensitive determination of levofloxacin

Supplementary files

Article information

Article type
Paper
Submitted
31 Oct 2022
Accepted
15 Dec 2022
First published
15 Dec 2022

New J. Chem., 2023,47, 2240-2247

A 3D carbon black disposable electrochemical sensor modified with reduced graphene oxide used for the sensitive determination of levofloxacin

T. P. Lisboa, R. S. Oliveira, W. B. V. de Oliveira, C. C. de Souza, G. F. Alves, M. A. C. Matos and R. C. Matos, New J. Chem., 2023, 47, 2240 DOI: 10.1039/D2NJ05338A

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