A5074853288- Analytical chemistry methods development
- Electrochemical sensors and biosensors
- Electrochemical Analysis and Applications
- Adsorption and biosorption for pollutant removal
- Analytical Chemistry and Sensors
- Analytical Chemistry and Chromatography
- Extraction and Separation Processes
- Pesticide Residue Analysis and Safety
- Advanced biosensing and bioanalysis techniques
- Analytical Methods in Pharmaceuticals
- Forensic Toxicology and Drug Analysis
- Minerals Flotation and Separation Techniques
- Mass Spectrometry Techniques and Applications
- Pharmacological Effects and Assays
- Neurotransmitter Receptor Influence on Behavior
- Nanomaterials for catalytic reactions
- Mesoporous Materials and Catalysis
- Gas Sensing Nanomaterials and Sensors
- Water Quality Monitoring and Analysis
- Cassava research and cyanide
- Food Safety and Hygiene
- Chemical Safety and Risk Management
- Chemical Synthesis and Characterization
- Metal Extraction and Bioleaching
- Radioactive element chemistry and processing
Universidade Estadual de Londrina
2013-2025
Michigan State University
2024
Rede de Química e Tecnologia
2021
Entomological Society of Brazil
2016
Abstract In this work, a simple and low‐cost method was developed for the simultaneous determination of antioxidants tert‐butylhydroquinone (TBHQ) butylated hydroxyanisole (BHA) in presence cationic surfactant CPB by square wave voltammetry (SWV) technique using carbon black paste electrode (CBPE). The performance investigated varying parameters such as pH, electrolyte, type concentration surfactant. Under optimum conditions 0.2 mol L −1 phosphate buffer (pH 7.0), 600.0 μmol cetylpyridinium...
In the present study synthesis of a nanocomposite based on multi-walled carbon nanotubes grafted by poly(methacrylic acid–hemin) is described.
In this study, a novel electrochemical assay for determining 17-β-estradiol (E2) was proposed. The approach involves modifying glassy carbon electrode (GCE) with nanocomposite consisting of α-Fe2O3 nanoparticles supported on nanotubes (CNTs)-denoted as α-Fe2O3-CNT/GCE. synthesis the α-Fe2O3-CNT achieved through simple and cost-effective hydrothermal process. Morphological chemical characterization were conducted using scanning electron microscopy (SEM), Raman spectroscopy, energy-dispersive...
Abstract In this paper, the evaluation of a boron‐doped ultrananocrystalline diamond (BD‐UNCD) electrode for determination ibuprofen (IBU) in pharmaceutical formulations using batch‐injection analysis with amperometric detection (BIA‐AD) is presented. The BD‐UNCD was characterized by Raman spectroscopy and electrochemical measurements were carried out before after anodic pretreatment. An improved response IBU oxidation observed as compared to commercial electrode. optimized method based on...
This paper describes the development of an electrochemical sensor highly selective to Pb2 + ions based on drop-coated glassy carbon electrode (GCE) with a suspension ion imprinted polymer (IIP) loaded 1-(2-pyridylazo)-2-naphthol (PAN) (IIP-PAN) and multi-walled nanotubes (MWCNT). The has been characterized by SEM TGA. method is open-circuit preconcentration onto modified in 0.05 mol L− 1 Tris-HCl buffer solution at pH 6.0 during 20 min. reduction was than performed closed circuit − 1.2 V 60...
Abstract This paper describes the development of a new electrochemical sensor for 17β‐estradiol (E2) determination based on glassy carbon electrode (GCE) modified with molecularly imprinted polymer grafted onto iniferter‐multiwall nanotubes surface (MIP‐MWCNT) and dihexadecyl‐hydrogen‐phosphate (DHP). The method was closed‐circuit preconcentration E2 in 0.1 mol L −1 phosphate buffer (pH 7.0) during 500 s. Upon preconcentration, determined by differential pulse voltammetry (DPV) exhibiting...
Abstract A new voltammetric sensor based on molecularly imprinted poly(acrylic acid)‐MWCNT nanocomposite (MIP‐MWCNT) drop‐coated onto glassy carbon electrode (GCE) was developed and applied to tramadol (TR) determination in pharmaceutical samples. The prepared by suspension of MIP‐MWCNT at 1 : (w/w) ratio show an improved performance compared unmodified GCE. electrochemical method is preconcentration modified GCE surface −1.5 V vs Ag/AgCl for 180 s 0.1 Britton‐Robinson buffer (pH 8.0)...
The synthesis of a nanocomposite based on molecularly imprinted poly(methacrylic acid) (MIP) grafted an iniferter-modified carbon nanotube (MIP/MWCNT) by living-radical polymerization and its application for 17β-estradiol (E2) adsorption is described. nonimprinted (NIP/MWCNT) the polymers MIP NIP synthesized in absence nanotubes were also prepared characterized FT-IR, TGA, nitrogen adsorption–desorption measurements, SEM TEM techniques. From images, narrow layer at nanoscale onto MWCNT...
Metal-organic framework (MOF) UiO-66 was synthesized and evaluated as solid-phase extractor support for cadmium preconcentration in a micro-flow injection system coupled to thermospray flame furnace atomic absorption spectrometry (TS-FF-AAS) detection. The adsorbent characterized by X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), Raman spectroscopy, textural data from N2 adsorption/desorption isotherm data. optimized conditions were...
The objective of the present work was to determine contents formol (formaldehyde) in hair-straightening products used various beauty salons. Formol can cause damages hair, it is also toxic and carcinogenic medium term. Despite being banned by Brazilian Health Surveillance Agency (ANVISA) frequently utilized, disguised with flavorings, its presence not noted on product labels. Therefore, study intended evaluate levels samples taken city Rolandia (Paraná State, Brazil), where surveillance does...
Abstract This paper reports the development of a simple electroanalytical method for imazethapyr (IMT) determination in rice samples based on molecularly imprinted polymer and functionalized carbon black paste electrode (MIP‐fCBPE). Carbon (CB) was by insertion oxygenated functional groups upon acid treatment with HNO 3 H 2 SO 4 . The (fCB) presented higher performance IMT than CB without functionalization. polyvinylimidazole (MIP‐VN) fCBPE promoted significant increase cathodic peak current...
The collection, processing, and electrochemical analysis of exhaled breath condensate (EBC) from healthy human animal subjects is reported on. EBC a biospecimen potentially rich in biomarkers respiratory disease. pH was analyzed potentiometrically using disposable polyaniline (PANI)-modified inkjet-printed (IJP) carbon electrode. Comparison measurements were performed commercial screen-printed (SPC) PANI-modified electrodes exhibited reproducible near-Nernstian responses for values between 2...
Flow injection analysis with chronoamperometry detection using a cathodically pretreated boron-doped diamond electrode (CPT-BDDE) was employed to develop and optimize novel method for the determination of hormones 17-α-ethinylestradiol (EE2) cyproterone acetate (CPA). The electrochemical properties EE2 CPA were evaluated by cyclic voltammetry oxidation peaks observed at 0.97 V 1.60 in 0.04 mol L−1 Britton-Robinson buffer (pH 2.0). Analytical curves linear concentration range from 0.070 10.0...