Article
Biochemical Research Methods
Lucas Vinicius de Faria, Davi Marques de Farias, Thalles Pedrosa Lisboa, Maria Auxiliadora Costa Matos, Rodrigo Alejandro Abarza Munoz, Renato Camargo Matos
Summary: The study utilized a batch injection analysis system with reduced graphene oxide as a modifier for the amperometric detection of levofloxacin and ciprofloxacin in pharmaceutical formulations, synthetic urine, and milk. The developed methods showed excellent analytical performance with high recovery rates and a minimum sample preparation requirement, making them suitable for routine analysis and quality control.
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Analytical
Chen Liu, Lisa Mueller-Botticher, Chang Liu, Jurgen Popp, Dagmar Fischer, Dana Cialla-May
Summary: A Raman-based label-free analytical method was developed to detect ciprofloxacin in different matrices. The method allows for semiquantification and can overcome interference from excipients and carrier substances. Surface-enhanced Raman spectroscopy is applied for sensitive detection, and the method can also monitor the degradation of ciprofloxacin within pharmaceutical formulations.
Article
Biochemistry & Molecular Biology
Stanislawa Koronkiewicz
Summary: In this study, an innovative flow-through photometric detector, the double-DID, was successfully used for determining iron content in pharmaceuticals. The method was stable, quick, had low reagent and sample consumption, and produced minimal waste.
Article
Engineering, Chemical
Kuo Yuan Hwa, Aravindan Santhan, Anindita Ganguly, Tata Sanjay Kanna Sharma
Summary: In this study, simultaneous electrochemical sensing of acetaminophen (ACAP) and ciprofloxacin (CIP) was achieved using Mn-2 SnO4/rGO on a glassy carbon electrode. The Mn-2 SnO4/rGO exhibited excellent electron mediating behavior and demonstrated the ability to oxidize both ACAP and CIP. The detection limits for simultaneous detection were lower compared to previous reports, making this method promising for applications in various real samples.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2022)
Review
Environmental Sciences
S. Akash, Baskaran Sivaprakash, Natarajan Rajamohan, Muthusamy Govarthanan, B. Tamil Elakiya
Summary: The present article reviews the treatment of pharmaceutical contaminants, such as ibuprofen and ciprofloxacin, in water using graphene-based materials. Three methods, adsorption, photocatalytic degradation, and electro-fenton reactions, are discussed in detail, along with their optimal operating conditions. The study found that graphene-derived adsorbents demonstrated complete removal of ibuprofen from wastewater at pH 7 for 60 minutes, and a 99% uptake of ciprofloxacin was achieved with graphene nanoplates/boron nitrate aerogel at pH 7 for 60 minutes. Additionally, the article highlights the future perspectives and research gaps in the application of graphene-based materials.
Article
Multidisciplinary Sciences
K. O. Sodeinde, S. O. Olusanya, O. S. Lawal, M. Sriariyanun, A. A. Adediran
Summary: In this study, a nanocomposite of reduced graphene oxide-ZnO (rGO-ZnO) was successfully synthesized using a bioreduction process with waste dry cell batteries as the precursor. The nanocomposite showed high efficiency in the ultraviolet photocatalytic degradation of chloramphenicol (CAP) and exhibited significant reduction in chemical oxygen demand (COD) levels in veterinary effluent.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Analytical
Mansour Mahmoudpour, Houman Kholafazad-kordasht, Jafar Ezzati Nazhad Dolatabadi, Mohammad Hasanzadeh, Aziz Homayouni Rad, Mohammadali Torbati
Summary: The constant need for food resources by humans and animals has led to an overuse of antibiotics, resulting in risks to food safety and the environment. Therefore, the development of simple and sensitive methods for fast monitoring of antibiotic levels is highly desirable. A new sensitive and easy-to-use strategy based on electrochemical single off apta-assay toward ciprofloxacin has been described, showing promising results for antibiotic detection.
ANALYTICA CHIMICA ACTA
(2021)
Article
Electrochemistry
Reyhane Rahimpour, Bahare Sabeti, Fereshteh Chekin
Summary: Nitrogen-doped porous reduced graphene oxide (N-prGO) was synthesized and used as the active material in a new electrochemical sensor for the detection of fluoroquinolone ciprofloxacin (Cip). The N-prGO-based sensor showed improved sensitivity and accuracy in detecting Cip in human serum and pharmaceutical samples.
RUSSIAN JOURNAL OF ELECTROCHEMISTRY
(2021)
Article
Energy & Fuels
Amira Alazmi, Charles Tai-Chien Wan, Pedro M. F. J. Costa, Fikile R. Brushett
Summary: Varying the drying step in graphene synthesis can produce rGO electrocatalysts with nearly identical chemical composition but different textures. Critical point drying can lead to a three-fold increase in BET surface area. Decorating carbon felt electrodes with rGO microparticles via a flow deposition procedure can improve performance and durability in VRFB cells.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Chemistry, Physical
Aaron Morelos-Gomez, Souya Terashima, Ayaka Yamanaka, Rodolfo Cruz-Silva, Josue Ortiz-Medina, Roque Sanchez-Salas, Juan L. Fajardo-Diaz, Emilio Munoz-Sandoval, Florentino Lopez-Urias, Kenji Takeuchi, Syogo Tejima, Mauricio Terrones, Morinobu Endo
Summary: This study demonstrates that graphene oxide membranes have higher lactose permeation flux and water flux recovery compared to commercial nanofiltration and ultrafiltration membranes, showing better filtration performance and anti-fouling ability.
Article
Engineering, Environmental
M. Azriouil, A. Loudiki, F. Laghrib, Y. El Bouabi, S. El Houssame, A. Farahi, M. Bakasse, S. Lahrich, M. A. EL Mhammedi
Summary: In this study, graphene oxide (GO) reduced by ethyl acetate was used to modify the graphite electrode (rGO-CPE) for the detection of Ciprofloxacin (Cipro). The rGO-CPE was characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The electrochemical behavior of Cipro was studied in a phosphate buffer solution (0.1 mol/L PBS, pH 7). Under optimized parameters, the detection limit obtained was DL=2.18 x 10-9 mol/L. The developed sensor exhibited excellent repeatability with a relative standard deviation (RSD) of 2.917% (n=8) and has been successfully applied for Cipro recognition in urine and pharmaceutical formulation samples.
JOURNAL OF HAZARDOUS MATERIALS ADVANCES
(2023)
Article
Energy & Fuels
Sadegh Aberoumand, Deepak Dubal, Peter Woodfield, Kiran Mahale, Hong Duc Pham, Chinmayee Padwal, Tran Tung, Muhammad JA. Shiddiky, Dzung Viet Dao
Summary: This paper investigates the electrochemical performance of a newly prepared reduced graphene oxide (rGO) nanofluidic vanadium electrolyte for Vanadium Redox Flow Batteries (VRFB). The study finds that the use of rGO nanofluid can enhance the performance of both electrode and electrolyte in the battery. The results show that increasing the concentration of rGO improves the electrochemical performance of the vanadium electrolyte, with approximately 15% to 20% improvements in peak potential separation and current density rates.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Energy & Fuels
Sadegh Aberoumand, Deepak Dubal, Peter Woodfield, Seyed Masoud Parsa, Kiran Mahale, Hong Duc Pham, Tran Tung, Hong-Quan Nguyen, Dzung Viet Dao
Summary: This study aims to experimentally investigate the long-term effect of using reduced graphene oxide (rGO) nanofluidic electrolyte on vanadium redox flow battery performance. The results show that the optimum concentration of nanofluidic electrolyte (0.1 wt%) can significantly improve the oxidation/reduction peaks, charge transfer resistance, and redox reactions reversibility of the battery. The active surface area of the electrodes is also increased by a significant percentage.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Chemistry, Analytical
Guilherme Figueira Alves, Thalles Pedrosa Lisboa, Lucas Vinicius de Faria, Davi Marques de Farias, Maria Auxiliadora Costa Matos, Renato Camargo Matos
Summary: A new electrochemical sensor based on pencil graphite was developed for the determination of ciprofloxacin, showing good reproducibility and accuracy. The method exhibited satisfactory analytical performance and was proven to be reliable for the quality control of pharmaceutical formulations.
Article
Engineering, Environmental
Komal, Kanu Gupta, Nidhi, Anupama Kaushik, Sonal Singhal
Summary: Efforts have been made to synthesize sustainable nanoadsorbents from surplus biomass utilizing green synthetic strategies. Functionalized graphene oxide and cellulose nanofibers were compared for their adsorption performance, showing the potential for sustainable resource utilization from surplus biomass.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Electrochemistry
Guilherme Figueira Alves, Lucas Vinicius de Faria, Thalles Pedrosa Lisboa, Maria Auxiliadora Costa Matos, Renato Camargo Matos
Summary: In this study, electrochemical treatment based on cyclic voltammetry was used to improve the properties of pencil graphite electrodes. The treated electrodes showed an efficient exfoliation of graphene sheets on the surface, leading to a significant increase in the electroanalytical response to ciprofloxacin. The sensor exhibited excellent analytical performance with a low detection limit, wide working linear range, and good selectivity and accuracy for antibiotic detection.
JOURNAL OF APPLIED ELECTROCHEMISTRY
(2023)
Article
Agriculture, Multidisciplinary
Raquel G. Rocha, Lucas V. de Faria, Vanessa F. Silva, Rodrigo A. A. Munoz, Eduardo M. Richter
Summary: A low-cost and portable electrochemical method for detecting sulfanilamide residues in honey was developed using a 3D-printed disposable device. The method demonstrated linear concentration ranges, a low detection limit, and suitable RSD values, and it was selective for sulfanilamide in honey samples. The results obtained by the proposed method were statistically similar to those obtained by HPLC, indicating the accuracy and absence of matrix interference in the analysis.
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
(2023)
Article
Chemistry, Analytical
William B. Veloso, Vanessa N. Ataide, Diego P. Rocha, Helton P. Nogueira, Abner de Siervo, Lucio Angnes, Rodrigo A. A. Munoz, Thiago R. L. C. Paixao
Summary: The combination of CO2 laser ablation and electrochemical surface treatments enhances the electrochemical performance of 3D-printed CB/PLA electrodes by producing Na2O flower-like nanostructures on their surface. SEM images show that the treatment ablates the polymeric layer of the electrode, exposing a porous surface for the formation of Na2O nanostructures. The electrodes treated by this combined method exhibit improved performance and electrochemical response for tyrosine oxidation, making them suitable sensors for biological sample analysis, even at low analyte concentrations.
Article
Chemistry, Multidisciplinary
Thalles Pedrosa Lisboa, Raylla Santos Oliveira, Wallace Burger Verissimo de Oliveira, Cassiano Cunha de Souza, Guilherme Figueira Alves, Maria Auxiliadora Costa Matos, Renato Camargo Matos
Summary: The study presents a simple method for fabricating an electrochemical sensor using 3D-printed conductive carbon black and polylactic acid-based filament (3D-CB/PLA). The sensor was modified with reduced graphene oxide (rGO) and successfully used for monitoring levofloxacin in various samples. The modified sensor showed improved electroanalytical performance and higher sensitivity, making it promising for routine implementation.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Electrochemistry
Daniel S. Araujo, Luciano C. Arantes, Lucas V. Faria, Karla A. O. Souza, Dilton M. Pimentel, Sandro L. Barbosa, Eduardo M. Richter, Rodrigo A. A. Munoz, Wallans T. P. dos Santos
Summary: This study presents the electrochemical detection of 5F-MDMB-PICA, one of the most reported synthetic cannabinoids in seized forensic samples, for the first time. The method uses an adsorptive stripping differential pulse voltammetry (AdSDPV) technique with a boron-doped diamond electrode (BDDE) and demonstrates good selectivity and stability for 5F-MDMB-PICA detection. The method has a wide linear range and low limit of detection, making it suitable for fast screening and on-site application in forensic analysis.
ELECTROCHIMICA ACTA
(2023)
Article
Electrochemistry
Pedro H. S. Borges, Laiz C. D. Narciso, Guilherme Fernandes de Souza Miguel, Guedmiller Souza de Oliveira, Moacyr Comar Junior, Antonio Eduardo da Hora Machado, Rodrigo A. A. Munoz, Edson Nossol
Summary: This work evaluates the electrocatalytic oxidation of hydrazine (HDZ) by silver (AgHCF) and copper (CuHCF) hexacyanoferrates-modified glassy carbon electrodes kinetically and analytically through experimental electrochemistry and theoretical approaches. The AgHCF and CuHCF-modified electrodes showed quasi-reversible characteristics driven by K+ diffusion and adsorption processes, respectively. The CuHCF modified electrode showed superior kinetic properties and sensitivity compared to the AgHCF-modified electrode, which can be attributed to its cubic structural arrangement.
ELECTROCHIMICA ACTA
(2023)
Article
Chemistry, Analytical
Wallace Burger Verissimo de Oliveira, Thalles Pedrosa Lisboa, Cassiano Cunha de Souza, Maria Auxiliadora Costa Matos, Renato Camargo Matos
Summary: This study aimed to develop a disposable electrode for the determination of Nimesulide in various samples. The electrode was made of a cheap and robust composite material immobilized on a 3D support. The optimized method showed satisfactory linear range, good precision, and excellent detectability, making the proposed device a promising analytical tool for routine analysis of Nimesulide.
MICROCHEMICAL JOURNAL
(2023)
Article
Chemistry, Analytical
Murillo N. T. Silva, Raquel G. Rocha, Eduardo M. Richter, Rodrigo A. A. Munoz, Edson Nossol
Summary: A rapid and simple method for the determination of glucose was evaluated using a nanocomposite film. The film showed excellent electrocatalytic activity for the oxidation of glucose in an alkaline medium.
Article
Chemistry, Analytical
Wallace B. V. de Oliveira, Thalles P. Lisboa, Gabriela C. da Silva, Raylla S. Oliveira, Cassiano C. de Souza, Maria A. C. Matos, Marcone A. L. de Oliveira, Renato C. Matos
Summary: In this paper, a disposable electrode modified with silver nanoparticles immobilized on 3D acrylonitrile butadiene styrene (ABS) support was developed for the determination of sulfamethoxazole (SMX) in various samples. The electrode showed improved electrochemical response for SMX compared to the bare sensor. The determination of SMX was optimized using the differential pulse voltammetry (DPV) technique and achieved satisfactory results in terms of linear range, detectability, precision, and recovery.
MICROCHEMICAL JOURNAL
(2023)
Article
Chemistry, Analytical
Tiago A. Matias, David L. O. Ramos, Lucas V. Faria, Abner de Siervo, Eduardo M. Richter, Rodrigo A. A. Munoz
Summary: A new electrochemical device is developed by combining 3D printing and laser-generated graphene sensors. The device utilizes 3D-printed cells and electrodes, as well as laser-induced graphene, to achieve excellent electrochemical sensing properties for the detection of atropine in beverages. The method shows a linear range, low detection limit, and satisfactory precision, making it a useful portable analytical tool for on-site applications in the forensic scenario.
Article
Chemistry, Analytical
Thalles Pedrosa Lisboa, Lucas Vinicius de Faria, Wallace Burger Verissimo de Oliveira, Raylla Santos Oliveira, Maria Auxiliadora Costa Matos, Rafael Machado Dornellas, Renato Camargo Matos
Summary: This paper describes a novel conductive filament based on graphite dispersed in a polylactic acid polymer matrix for producing 3D-electrochemical devices. The resulting composite material showed improved electrochemical performance compared to conventional electrodes, and a square wave voltammetry method using this material demonstrated strong potential for evaluating antibiotic species in routine applications. The device is disposable, cost-effective, and can be produced in financially limited laboratories.
Article
Chemistry, Analytical
Jian F. S. Pereira, Marina Di-Oliveira, Lucas V. Faria, Pedro H. S. Borges, Edson Nossol, Rogerio V. Gelamo, Eduardo M. Richter, Osmando F. Lopes, Rodrigo A. A. Munoz
Summary: A cold CO2 plasma treatment was shown to improve the electrochemical activity of graphite sheet (GS) electrodes by increasing surface defects and oxygenated functional groups. This treatment significantly enhanced the electron transfer coefficient and reduced the resistance to charge transfer. The CO2-GS electrode demonstrated high sensitivity for the detection of emerging contaminant species in natural waters and urine samples, with submicromolar limit of detection values achieved.
Article
Chemistry, Analytical
Carlos E. C. Lopes, Lucas V. de Faria, Diele A. G. Araujo, Eduardo M. Richter, Thiago R. L. C. Paixao, Luiza M. F. Dantas, Rodrigo A. A. Munoz, Iranaldo S. da Silva
Summary: In this study, a 3D-printed electrode was manufactured using a conductive filament and used for the detection of antibiotics. By improving the electrode preparation method, the fouling phenomenon on the electrode surface was solved, and comparable analytical performance to conventional electrodes was achieved. This method is suitable for routine analysis of environmental, pharmaceutical, and food samples.
Article
Chemistry, Multidisciplinary
Taissa S. Cabral, Suellen F. L. do Nascimento, Lucas V. de Faria, Thalles P. Lisboa, Pedro H. S. Borges, Edson Nossol, Felipe S. Semaan, Rafael M. Dornellas, Wagner F. Pacheco
Summary: Silver nanoparticles (AgNPs) obtained from photographic waste were synthesized and electrodeposited onto an epoxy-graphite composite substrate. The modified electrode showed improved electrochemical properties compared to the unmodified electrode, with lower charge transfer resistance, more kinetically favored electron transfer, and increased active area. The presence of AgNPs on the carbonaceous surface was confirmed by SEM and Raman spectroscopy. The modified electrode demonstrated enhanced analytical performance for Pb2+ detection, with a wider linear range, lower detection limit, and increased sensitivity compared to the unmodified electrode. The method was successfully applied to real water samples with varying levels of Pb2+. The reuse of silver waste provides an effective and low-infrastructure solution for electrochemical sensing applications.
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Analytical
Thalles Pedrosa Lisboa, Gabriela Couto da Silva, Raylla Santos Oliveira, Wallace Burger Verissimo de Oliveira, Cassiano Cunha de Souza, Maria Auxiliadora Costa Matos, Renato Camargo Matos
Summary: To combat the emergence of bacteria resistant to fluoroquinolones, a low-cost and sensitive electrochemical device is proposed. The device is made with a lab-made conductive ink based on graphite powder and nail polish immobilized on a rigid polyvinyl chloride support. The device also utilizes electrodeposition of silver nanoparticles to enhance its electroanalytical performance. The device was successfully applied for levofloxacin monitoring in various samples and showed wide linear working range, low detection limit, and suitable accuracy and precision.
ANALYTICAL METHODS
(2023)