期刊
ANALYTICAL METHODS
卷 14, 期 39, 页码 3867-3874出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2ay01137a
关键词
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资金
- FAPEMIG (Research Support Foundation of the State of Minas Gerais) [APQ00042-2021]
- CNPq (National Council for Scientific and Technological Development) [302685/2019-7]
- CAPES (Coordination for the Improvement of Higher Education Personnel) [001]
- PROPP/UFJF
This study presents a simple, fast, and inexpensive method for manufacturing a disposable pencil graphite electrode. The electrode shows superior electroanalytical performance for the detection of sulfanilamide and exhibits good stability and accuracy in real samples.
The present paper reports a simple, fast, and inexpensive process of manufacturing a disposable pencil graphite electrode (PGE) from widely available materials, which showed a reproducibility of at least 7.5%. The electrode was compared to the commercial glassy carbon electrode (GCE) and showed superior electroanalytical performance for sulfanilamide (SFA) with approximately 3.9-fold higher current density. Additionally, a displacement of the oxidation peak from approximately 80 mV to more cathodic regions was observed. Therefore, a method based on square wave voltammetry (SWV) was developed for the determination of the antimicrobial SFA in honey and tap water samples using the proposed sensor. The optimized method presented good detectability (LOD = 2.37 mu mol L-1), with excellent precision and accuracy (relative standard deviation < 4.2%) and percent recovery from spiked samples ranging from 92 to 97%. In addition, the sensor did not suffer significant interference from sample matrix components and other commonly evaluated antimicrobials, which demonstrates the potential of these electrodes for implementation in routine analysis and quality control.
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