Article
Chemistry, Analytical
Pavlina Havranova, Lukas Fojt, Lukas Kejik, Tomas Sikola, Miroslav Fojta, Ales Danhel
Summary: The electrodeposition of silver amalgam particles on screen-printed silver electrodes optimized for the detection of electrochemically reducible compounds. The method allowed for sensitive detection of organic compounds and artificial nucleosides, as well as proteins, showcasing potential applications in chemical and synthetic biology research.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Chemistry, Analytical
Julius Gajdar, Kristina Stafurova, Jiri Barek, Jan Fischer
Summary: A novel retractable-pen-based renewable silver amalgam film electrode (RAE) was introduced for electrochemical sensing of electrochemically reducible compounds, offering good repeatability and low limit of quantification for environmental pollutant detection. This electrode utilizes mechanisms found in a common retractable ballpoint pen for mechanical renewal of the amalgam film.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Biochemical Research Methods
Veronika Svitkova, Katarina Nemcekova, Vlastimil Vyskocil
Summary: In this study, a mercury meniscus-modified silver solid amalgam electrode was used for the detection of UV-induced DNA damage. The integrity of the double-stranded DNA layer was indirectly detected using methylene blue reduction, and different wavelengths of UV irradiation resulted in different electrochemical signals.
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Analytical
Anna Gorska, Beata Paczosa-Bator, Marek Szlosarczyk, Robert Piech
Summary: A new highly sensitive voltammetric method for captopril determination was developed using a renewable amalgam film electrode. The method showed low detection limit and good linearity range, suitable for analyzing samples such as tablets containing CPT and urine.
Article
Chemistry, Analytical
Uarlei Douglas dos Santos, Djenaine De Souza, Sergio Antonio Spinola Machado
Summary: This study presents a method for the determination of folic acid (FA) using polished silver solid amalgam electrode (p-AgSAE) and square wave voltammetry. The experimental and voltammetric parameters were optimized, and a well-defined voltammetric peak was observed on the p-AgSAE surface, indicating a reversible redox reaction involving reactant and product adsorption. A linear relationship between peak current and FA concentration was established, with a wide concentration range, high correlation coefficient, and good precision. The method was successfully applied to FA determination in spinach and corn chip samples, demonstrating the robustness of the proposed methodology and the advantages of using p-AgSAE as an alternative electrode.
JOURNAL OF ANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Analytical
Fernanda C. O. L. Martins, Djenaine De Souza
Summary: This work presents the development of an electroanalytical method for detecting nanomolar levels of selenium, utilizing a silver solid amalgam electrode modified with a stable mercury film and square-wave cathodic adsorptive stripping voltammetry. The optimized parameters resulted in satisfactory results, providing potential for selenium detection in food and beverage samples.
MICROCHEMICAL JOURNAL
(2021)
Article
Chemistry, Analytical
Andrii Dmukhailo, Sofiia Tvorynska, Liliya Dubenska
Summary: This research paper investigates the electrochemical reduction of the synthetic food azo dye tartrazine (TZ) on three different types of silver solid amalgam electrodes (AgSAEs). The study compares the performance of AgSAEs with dropping mercury electrode. The results show that m-AgSAE using LS-AdSV offers the best limit of detection (0.078 mu mol L-1) and the limit of quantification (0.24 mu mol L-1) for TZ determination.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Danielle Goncalves Filho, Djenaine de Souza
Summary: This study developed a simple, sensitive, fast, and green electroanalytical method for determining trifluralin herbicide in fresh food samples using a polished silver solid amalgam electrode (p-AgSAE) combined with square wave voltammetry (SWV). Optimization of experimental and voltammetric parameters allowed for the calculation of analytical parameters, indicating the suitability of p-AgSAE for detecting trifluralin contamination. The proposed methodology showed high robustness, stability, sensitivity, and reproducibility, making it applicable for complex samples such as eggplant, carrot, tomato, grape juice, and orange juice.
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Analytical
Li-Da Chen, Wei-Jhen Wang, Gou-Jen Wang
Summary: This study developed simple electrochemical electrodes for rapid detection of chloride, sodium, and potassium ions in human serum. Utilizing cyclic voltammetry and square-wave voltammetry, the electrodes demonstrated excellent selectivity, sensitivity, and suitability for ion concentrations in human serum.
Article
Chemistry, Analytical
Olga Vajdle, Sanja Mutic, Sanja Lazic, Zoltan Konya, Valeria Guzsvany, Jasmina Anojcic
Summary: The voltammetric characterization and determination of insecticide flonicamid were performed using a simple electrochemical sensor. The developed method proved to be effective for the determination of flonicamid in commercial formulations and spiked river water samples.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
(2022)
Article
Electrochemistry
Veronika Svitkova, Vlastimil Vyskocil
Summary: Cyclic voltammetry and differential pulse voltammetry were used to study the behavior of methylene blue at a mercury meniscus-modified silver solid amalgam electrode. Electrochemical impedance spectroscopy was used for verification and comparison. It was found that the reduction signal of methylene blue was significantly higher at the DNA-modified silver amalgam electrode compared to the unmodified electrode, which correlated with changes in charge transfer resistance. Optimized parameters were determined for further biosensor development and applications.
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
(2022)
Article
Environmental Sciences
Afete Musliu, Lule Beqa, Gani Kastrati
Summary: Dental amalgam in dental clinics in Kosova serves as an unregulated source of mercury, with existing environmental policies lacking sufficient measures to control its use and waste management. Current national regulations categorize dental health care waste as hazardous, but fail to impose restrictions on amalgam use or enforce proper waste disposal, resulting in inconsistent legislation. New regulations, revised hazardous waste management standards, and infrastructure in compliance with EU regulations are needed to prevent adverse effects of amalgam waste.
INTEGRATED ENVIRONMENTAL ASSESSMENT AND MANAGEMENT
(2021)
Article
Biochemistry & Molecular Biology
Grace Buckey, Olivia E. Owens, Ainslee W. Gabriel, Claudia M. Downing, Margaret C. Calhoun, David E. Cliffel
Summary: This paper investigates the electrochemical behavior of p-aminophenol (PAP) on commercially available carbon screen-printed electrodes (CSPEs) and gold screen-printed electrodes (GSPEs). The results suggest that adsorption increases the signal production, while self-assembled monolayers prevent PAP adsorption. PAP adsorption leads to current variability, but decreasing its concentration improves measurement consistency. Multiple PAP oxidations cause polymerization.
Article
Nanoscience & Nanotechnology
Shekher Kummari, Lakshmi Panicker, K. Vengatajalabathy Gobi, Roger Narayan, Yugender Goud Kotagiri
Summary: A straightforward and disposable electrochemical sensor was developed for the detection of the antiviral drug valganciclovir (VGC) by electrodeposition of silver nanoparticles (AgNPs) on a conducting polymer and an acid-functionalized carbon nanotube-modified screen-printed carbon electrode (f-CNT/SPCE). The sensor exhibited high sensitivity, selectivity, reproducibility, and long-term storage stability. Potential real-world applications in point-of-care screening of antiviral drugs and industrial/environmental screening of antiviral drugs were demonstrated.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Analytical
Marco Antonio Modenes Junior, Maisa Azevedo Beluomini, Nelson Ramos Stradiotto
Summary: This study developed a simple, quick, and sensitive adsorptive stripping voltammetry (AdSV) method based on a solid amalgam electrode to determine sulfur in biodiesel. The method displayed good response and recovery values and could provide a fast assessment of the quality of biodiesel.
ANALYTICAL METHODS
(2022)
Article
Environmental Sciences
Ailton Jose Moreira, Sherlan Lemos, Dyovani Coelho, Lucia Mascaro, Gian Freschi, Ernesto Pereira
Summary: In this study, a spectrophotometric-chemometric approach was used to monitor the degradation of atrazine (ATZ) and its by-products after photolytic and photocatalytic oxidation. The results showed that the Spec-Chem method provided accurate and statistically comparable data to the reference technique of HPLC. The study also introduced a new hypothesis for the kinetic calculation of ATZ degradation, which showed a high correlation and optimal fit with the experimental data obtained.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
Dyovani Coelho, Joao Pedro R. S. Gaudencioa, Lucia H. Mascaro
Summary: We investigated the photoelectrodeposition of oxygen-evolving catalysts (OECs) based on oxy-hydroxides-phosphates of Co, Fe, or Ni (CoPi, FePi, and NiPi) on the WO3/BiVO4 heterojunction and their activity in water oxidation. The deposition of OECs significantly increased the photocurrent densities of the photoanodes, with FePi showing the best performance. Furthermore, the deposition of OECs also changed the morphology of the heterojunction.
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
(2022)
Article
Electrochemistry
Marina Medina, Patricia G. Corradini, Juliana F. de Brito, Hugo L. Sousa Santos, Lucia Helena Mascaro
Summary: Amorphous molybdenum sulfide (MoSx) is a highly active material for the hydrogen evolution reaction (HER). It can be electrodeposited on semiconductor substrates, and increasing the S atom content enhances its electrocatalytic activity.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Chemistry, Physical
Moises A. de Araujo, Magno B. Costa, Lucia H. Mascaro
Summary: By photoelectrodepositing a MoSx cocatalyst on Sb2S3 films, the occurrence of recombination was greatly suppressed, leading to an enhanced photoresponse and improved carrier transfer. The reduction of electron-hole recombination and the increase of carrier separation were confirmed through photogenerated transient analysis.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Ailton J. Moreira, Dyovani Coelho, Jeferson A. Dias, Lucia H. Mascaro, Gian P. G. Freschi, Valmor R. Mastelaro, Ernesto C. Pereira
Summary: In this study, a synergistic use of microwave energy and Microwave Discharge Electrodeless Lamp (MDEL) as a UV_Vis light source was applied for the first time to synthesize a photocatalyst (Smdoped TiO2) for degrading atrazine (ATZ) under UV-A light. The doped material showed lower recombination rates and higher performance in ATZ degradation compared to pristine TiO2 and Sm-doped TiO2. The photocatalytic degradation mechanism indicated that the doped material exhibited high efficiency in activating the ATZ hydrolysis reaction and generating more hydroxyl radicals. Moreover, the photoactivity of the catalyst remained stable even after multiple application cycles.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Review
Biochemistry & Molecular Biology
Danielle Goncalves-Filho, Djenaine De Souza
Summary: Antioxidants are food additives used to extend the shelf life of food and maintain its quality. However, the improper use of synthetic antioxidants can lead to environmental and health issues. Therefore, it is crucial to develop analytical methods for detecting and quantifying synthetic antioxidants in food.
Article
Chemistry, Analytical
Tiago Almeida Silva, Bruna Claudia Lourencao, Alexsandra Dias da Silva, Orlando Fatibello-Filho
Summary: In this work, the versatility of chitosan biopolymer was explored for the sustainable manufacture of novel electrochemical sensors based on carbon black and chitosan-stabilized platinum nanoparticles. Highly stabilized platinum nanoparticles were synthesized at room temperature and characterized. The electrochemical sensors showed excellent performance in the determination of hydrogen peroxide and bisphenol A with high sensitivity and accuracy.
ANALYTICAL METHODS
(2023)
Article
Chemistry, Analytical
Thatyara Oliveira Monteiro, Antonio Gomes dos Santos Neto, Alan Silva de Menezes, Flavio Santos Damos, Rita de Cassia Silva Luz, Orlando Fatibello-Filho
Summary: A sensitive and selective label-free photoelectrochemical immunosensor was developed for the detection of cardiac troponin I. The immunosensor utilized a Bi2S3/BiVO4/FTO platform, which showed enhanced photocurrent compared to a platform without Bi2S3. The immobilization of cTnI antibodies on the platform inhibited the photocurrent in the presence of cTnI, and the resulting photocurrent showed a linear relationship with the logarithm of cTnI concentration.
Review
Chemistry, Applied
Elis Marina Fonseca Almeida, Djenaine De Souza
Summary: Pesticides, when used inappropriately, can lead to contamination of the environment, soil, water, and foods. The accumulative effects of carbamates and dithiocarbamates pesticides in the human body can result in hormonal, neurological, and reproductive disorders, as well as carcinogenic or mutagenic effects. This review discusses the electroanalytical approach for detecting carbamates and dithiocarbamates, highlighting the advantages, disadvantages, and future prospects of voltammetric techniques in analyzing these pesticides in natural water and foods. It also emphasizes the importance of selecting appropriate materials for working electrodes in order to achieve sensitivity, selectivity, stability, and robustness in analytical applications.
Article
Chemistry, Analytical
Ademar Wong, Anderson M. M. Santos, Maria H. A. Feitosa, Orlando Fatibello-Filho, Fernando C. C. Moraes, Maria D. P. T. Sotomayor
Summary: The study developed a flow injection analysis (FIA) system using a cathodically pretreated boron-doped diamond electrode (CPT-BDD) and multiple-pulse amperometry (MPA) for simultaneous determination of uric acid (UA) and caffeine (CAF). The proposed method showed good repeatability and stability, and no interference from various substances was observed. The BDD sensor exhibited superior analytical performance compared to other sensors reported in the literature.
Article
Chemistry, Analytical
Lorranne Marins-Goncalves, Mariana Martins Ferreira, Leticia Rocha Guidi, Djenaine De Souza
Summary: The legislation evaluating mycotoxins in agricultural commodities and foodstuffs is important for ensuring food safety and consumer health. Therefore, the development of suitable analytical procedures for detecting mycotoxins in complex samples at low concentrations is necessary. This review discusses the application of modern chemical analysis methods for mycotoxin detection and highlights the need for more green and accurate extraction methods. The limitations of current detection techniques, such as low selectivity and limited calibration standards for spectroscopic techniques, are also addressed.
Article
Chemistry, Analytical
Rebeca M. S. Silva, Anderson M. Santos, Ademar Wong, Orlando Fatibello-Filho, Fernando C. Moraes, Marco A. S. Farias
Summary: A new electrode based on functionalized graphene and gold nanoparticles dispersed in a chitosan film was prepared for the determination of ofloxacin. The characterization of the electrode showed improved analytical signal, electrochemical activity, and electron transfer rate. The proposed sensor, determined by square-wave voltammetry, had a linear concentration range of 0.10-4.9 μmol L-1, demonstrating its successful application in pharmaceutical formulations, synthetic urine, and water river samples.
ANALYTICAL METHODS
(2022)
Article
Materials Science, Multidisciplinary
Anderson M. Santos, Ademar Wong, Orlando Fatibello-Filho, Fernando C. Moraes
Summary: This study reports the development and application of an amperometric biosensor based on carbon paste electrode modified with laccase enzyme, glutaraldehyde, and gold nanoparticles for the determination of dopamine. The materials were characterized morphologically and chemically. Optimization studies were performed to determine the optimal amount of enzyme and pH level. The biosensor showed a linear concentration range and detection limit when applied with the amperometric technique.
C-JOURNAL OF CARBON RESEARCH
(2022)
Article
Engineering, Environmental
Roberta Yonara Nascimento Reis, Lorena Athie Goulart, Lucia Helena Mascaro, Suellen Aparecida Alves
Summary: The deterioration of water quality and the need for its reuse have led to the development of various water treatment processes. The presence of different types of water contaminants has grown with urbanization, industrialization, agriculture, and livestock. Photoelectrochemical processes have gained popularity due to their ability to degrade pharmaceutical compounds, improving water quality for reuse.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Physical
Murilo Fernando Gromboni, Paulo Jorge Marques Cordeiro-Junior, Patricia Gon Corradini, Lucia Helena Mascaro, Marcos Roberto de Vasconcelos Lanza
Summary: A new green one-step route for obtaining Co2V2O7 has been reported in this study, and the material has shown potential as a catalyst for the oxygen reduction reaction and treatment of organic pollutants.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)