Reactive sputtering deposition of Co3O4 films and an evaluation of its use as an electrochemical sensor for ascorbic acid

Neto, Nilton Francelosi Azevedo; Angelico, João C.; Pelissari, Marcelo Rodrigues da Silva; Camargo, Luan Pereira; Simões, Rafael Plana; Dall’Antônia, Luiz Henrique; Silva, José Humberto Dias da

doi:10.1007/s10854-022-08804-7

Cited by 3 publications

(1 citation statement)

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“…The evaluation of molecular oxidation susceptibility was accomplished with Condensedto-Atoms Fukui Indexes (CAFIs): (i) f k + = q k (N + 1) − q k (N) for nucleophilic attack on atom k; (ii) f k − = q k (N) − q k (N − 1) for electrophilic attack on atom k; and (iii) f k 0 = 1 / 2 [q k (N + 1) − q k (N − 1)] for radical attack on atom k. Furthermore, q k (N + 1), q k (N), and q k (N − 1) represent the electronic Hirshfeld population on the k-th atom of anionic, cationic, and neutral species, respectively, of the studied compound [48][49][50]. CAFIs have been successfully used to identify oxidation, reduction, and charge exchange mechanisms in chemical reactions [51][52][53]. In addition, the location and spatial distribution of frontier molecular orbitals, specifically the highest occupied molecular orbital (HOMO), was illustrated using the Gabedit computational package [54].…”

Section: Theoretical Analysismentioning

confidence: 99%

Determination of Fluoxetine in Weight Loss Herbal Medicine Using an Electrochemical Sensor Based on rGO-CuNPs

Melaré,

Barreto,

Silva

et al. 2023

Molecules

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The rising popularity of herbal medicine as a weight loss remedy, fueled by misleading propaganda, raises concerns about the manufacturing processes and potential inclusion of controlled substances such as fluoxetine (FLU). The objective of this work is to develop and evaluate the performance of an electrochemical device by modifying a glassy carbon electrode (GC) with a nanocomposite based on reduced graphene oxide (rGO) and copper nanoparticles (CuNPs) for detecting FLU in manipulated herbal medicines. Scanning electron microscopy (FEG-SEM) and cyclic voltammetry (CV) were applied for morphological and electrochemical characterization and analysis of the composite’s electrochemical behavior. Under optimized conditions, the proposed sensor successfully detected FLU within the range of 0.6 to 1.6 µmol L−1, showing a limit of detection (LOD) of 0.14 µmol L−1. To determine the presence of FLU in herbal samples, known amounts of the analytical standard were added to the sample, and the analyses were performed using the standard addition method, yielding recoveries between −2.13 and 2.0%.

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