Review
Chemistry, Analytical
Fernanda C. O. L. Martins, Laura C. Pimenta, Djenaine De Souza
Summary: Antidepressants are pharmaceutical compounds used to treat depression and anxiety disorders, but inadequate ingestion can have adverse effects and environmental contamination. Electroanalytical techniques are effective in detecting and quantifying these compounds, with advantages such as low cost and simplified sample preparation steps.
JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
(2021)
Article
Chemistry, Analytical
Ma Lucia Abad-Gil, Ma Jesus Gismera, Teresa Sevilla, Jesus R. Procopio
Summary: In this study, the electrochemical behavior of MIT on a gold electrode was investigated and square wave voltammetric methods were developed for its determination at different concentration levels. MIT showed an irreversible and diffusion-controlled oxidation process, with pH-dependent potential and peak current values. By using square-wave voltammetry (SWV) and adsorptive stripping approach (SWAdSV), it is possible to determine MIT in water samples with high sensitivity and low detection limits. Both SWV and SWAdSV methods were successfully applied for the analysis of MIT in different water samples.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Analytical
Milos Ognjanovic, Katarina Nikolic, Marko Boskovic, Ferenc Pastor, Nina Popov, Marijan Marcius, Stjepko Krehula, Bratislav Antic, Dalibor M. Stankovic
Summary: In this paper, an electrochemical sensor for submicromolar detection of morphine (MORPH) was developed. The sensor is based on a modified carbon paste electrode and optimized by investigating the ratio of iron tungstate in the electrode material. The results showed that the sensor has good selectivity, repeatability, and a low detection limit.
Article
Chemistry, Analytical
Vahid Riahifar, Nahid Haghnazari, Fatemeh Keshavarzi, Elahe Ahmadi
Summary: This study introduced a sensitive sensor for detecting MET based on a modified glassy carbon electrode using Fe3O4@PPy core-shell and ErGO. The sensor was characterized using FE-SEM and EIS, showing better analytical performance compared to other modified electrodes for MET detection. The sensor exhibited a wide linear range and low detection limit, with good reproducibility, sensitivity, and long-term performance, making it a promising candidate for MET determination in urine and serum samples.
MICROCHEMICAL JOURNAL
(2021)
Article
Biochemistry & Molecular Biology
Juliana Costa Rolim Galvao, Mayara da Silva Araujo, Maiyara Carolyne Prete, Vanildo Leao Neto, Luiz Henrique Dall'Antonia, Roberto Matos, Cesar Ricardo Texeira Tarley, Roberta Antigo Medeiros
Summary: A novel electrochemical assay for determining 17-beta-estradiol (E2) was proposed in this study. By modifying a glassy carbon electrode (GCE) with a nanocomposite consisting of alpha-Fe2O3 nanoparticles supported on carbon nanotubes (CNTs), the detection of E2 was enhanced and electrode surface fouling was prevented. The optimized experimental conditions allowed for accurate and fast determination of E2 in a wide concentration range.
Article
Chemistry, Analytical
Mahmoud AbdAllah, A. A. Hathoot, M. Abdel-Azzem
Summary: This study investigated the electrochemical oxidation of Thioctic Acid (TA) on a Carbon Paste Electrode (CPE) modified with copper-cobalt nanostructures and poly (1,5-Diaminonaphthalene) using square-wave voltammetry and cyclic voltammetry. The voltammetric sensor showed sensitivity to TA oxidation and the effects of deposition cycles, electro-polymerization, scan rate, and pH were optimized. The sensor exhibited good identification capabilities for TA with a linear response range of 0.6 µM to 150 µM and a detection limit of 0.48 µM. The oxidation of TA was controlled by the adsorption process. The proposed sensor and method were successfully used for TA determination in real samples.
Article
Chemistry, Analytical
Diele A. G. Araujo, Ana C. M. Oliveira, Lauro A. Pradela-Filho, Regina M. Takeuchi, Andre L. Santos
Summary: Voltammetry and amperometry are inexpensive and high-performance analytical techniques, but lack selectivity in complex matrices. A new cost-effective approach was presented in this study to combine sample pretreatment and voltammetric detection into a single step, achieving fast quantification of sulfite in beverage samples. The proposed system, despite its simplicity and low cost, showed good analytical performance and can be applied to quantify any volatile electroactive species, providing a unique way to assess real-time extraction curves and optimize new gas extraction procedures.
ANALYTICA CHIMICA ACTA
(2021)
Article
Multidisciplinary Sciences
Semira Biya, Negussie Negash, Tesfu Hailu, Gizaw Tesfaye, Estifanose Ele Yaya
Summary: This paper presents a highly sensitive Voltammetric sensor for determining brucine in artificial urine samples using a choline chloride modified glassy carbon electrode (ChCl/GCE). The electrode was modified by electrodeposition of choline chloride onto the glassy carbon electrode surface using cyclic voltammetry. The modified electrode showed a well-resolved peak current for the oxidation of brucine and a pair of quasi-reversible peaks. The study also demonstrated the selectivity, reproducibility, and long-term stability of the ChCl/GCE for the electrochemical reduction of brucine.
Article
Chemistry, Multidisciplinary
Neda Raeisi-Kheirabadi, Alireza Nezamzadeh-Ejhieh
Summary: In this study, nickel oxide nanoparticles calcined at 200 degrees Celsius were used as a modifier of carbon paste electrode to quantify tamoxifen in aqueous solution. The square wave voltammetry method successfully detected TAM concentration in the range of 10-60 nM, with LOD and LOQ limits of 1.81 +/- 0.35 and 6.05 +/- 0.24 nM, respectively.
Article
Nanoscience & Nanotechnology
Artur Huseinov, Chaminda P. Nawarathne, Noe T. Alvarez
Summary: This paper introduces the first application of a covalently attached carbon nanotube film to a nanostructured gold electrode for electrochemical detection of hydrogen peroxide. The introduction of properly aligned carbon nanotubes significantly enhances the electroactive surface area and current response, leading to a stable signal under oxidative conditions. In addition, the functional groups on the carbon nanotube surface offer possibilities for simple functionalization.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Analytical
Fernanda S. Soares, Raissa T. E. Ramalho, Amanda C. Silva, Mario C. U. Araujo
Summary: A sensitive, simple, fast, and inexpensive method for determining diuron in water using square wave voltammetry and a glassy carbon electrode is presented. This method was developed to evaluate diuron contamination in river waters close to sugarcane cultivation, located in the metropolitan region of Joao Pessoa, in the state of Paraiba, Brazil. The results showed that the proposed method has a linear response ranging from 38.5-115.0 nmol L-1 (r(2) = 0.993), a LOD equal to 0.2 nmol L-1, and recovery rates from 88.0 to 108.0%. The method does not require any previous chemical treatment of the sample, contributing to green analytical chemistry.
Article
Chemistry, Analytical
Jhonys M. Freitas, Pablo R. L. Silva, Rodrigo A. A. Munoz, Eduardo M. Richter
Summary: This study developed a fast method for detecting ephedrine and demonstrated its potential value in various applications, such as criminal forensic analysis and anti-doping control. The portable nature of the method and the ability to quantify ephedrine in representative samples without pre-treatment make it a promising tool for weight-loss product adulteration detection.
MICROCHEMICAL JOURNAL
(2021)
Article
Polymer Science
Ani Mulyasuryani, Yuniar Ponco Prananto, Qonitah Fardiyah, Hanandayu Widwiastuti, Darjito Darjito
Summary: Molecularly Imprinted Polymers (MIPs) modified screen-printed carbon electrode (SPCE) was developed for the determination of p-aminophenol (p-AP). The MIP was prepared using p-AP as a template, chitosan as a base polymer, and glutaraldehyde and sodium tripolyphosphate as crosslinkers. The results showed that the MIP selectively accumulated analytes on the electrode surface, and MIP with glutaraldehyde as a crosslinker increased the signal.
Article
Chemistry, Analytical
Rafaela C. Freitas, Luiz O. Orzari, Luis M. C. Ferreira, Thiago R. L. C. Paixao, Wendell K. T. Coltro, Fernando C. Vicentini, Bruno C. Janegitz
Summary: This study reported the development of an electrochemical device comprising a self-adhesive electrode based on a graphite-automotive varnish mixture, suitable for melatonin determination, showing linear behavior and exciting analysis results, with important applications in biological and pharmaceutical fields.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Analytical
Edgar Nagles, Monica Bello, John J. Hurtado
Summary: This report presents a new application of the chitosan-graphene glassy carbon electrode (Ch-G/GCE) system for the determination of hydroxyflavonoid morin (MR). The system utilizes square-wave voltammetry (SWV) to measure MR, and exhibits a significant increase in anodic peak current compared to the unmodified glassy carbon electrode.