A5036388910- Electrochemical sensors and biosensors
- Electrochemical Analysis and Applications
- Analytical Chemistry and Sensors
- Analytical Methods in Pharmaceuticals
- Dye analysis and toxicity
- Biochemical Analysis and Sensing Techniques
- Pharmacological Effects and Assays
- Advanced Chemical Sensor Technologies
- Analytical Chemistry and Chromatography
- Analytical chemistry methods development
- Forensic Toxicology and Drug Analysis
- Vitamin C and Antioxidants Research
- Pharmaceutical Quality and Counterfeiting
- Advanced biosensing and bioanalysis techniques
- Molecular Sensors and Ion Detection
- Medicinal Plants and Neuroprotection
- Corrosion Behavior and Inhibition
- Mass Spectrometry Techniques and Applications
- Pesticide Residue Analysis and Safety
- Hormonal and reproductive studies
- melanin and skin pigmentation
Universidade Estadual de Londrina
2015-2025
Universidade Estadual do Oeste do Paraná
2014-2018
Universidade Federal de São Carlos
2007-2015
Departamento de Ciência e Tecnologia
2015
Abstract The several outstanding properties of boron‐doped diamond electrodes (BDDEs) have allowed their application for various purposes, among them electrochemical sensing. However, the response many redox species on BDDEs can be strongly dependent whether surfaces are predominantly hydrogen‐ (HT) or oxygen‐terminated (OT). Fortuitously, pretreatments themselves used to enrich in situ BDEE surface one other type termination. a cathodically pretreated BBDE (CPT‐BDDE) becomes enriched HTs,...
The independent determination of two β-blocker agents, namely propranolol (PROP) and atenolol (ATN), in pharmaceutical formulations using square-wave voltammetry a cathodically pretreated boron-doped diamond electrode is described. These electroanalytical determinations or were carried out 0.1 mol L−1 H2SO4 0.5 NaNO3 (pH 1.0, adjusted with concentrated HNO3), respectively. Excellent linear calibration curves, ranging from 0.20 to 9.0 μmol for PROP 2.0 41 ATN, detection limits 0.18 0.93 L−1,...
A method for simultaneous determination of butylated hydroxyanisole (BHA) and hydroxytoluene (BHT) in food was developed that uses multiple pulse amperometry (MPA) with flow injection analysis (FIA). Determination these phenolic antioxidants carried out a cathodically pretreated boron-doped diamond electrode an aqueous ethanolic (30% ethanol, v/v) 10 mmol L−1 KNO3 solution (pHcond = 1.5) as supporting electrolyte. dual-potential waveform, at Edet1 850 mV/200 ms Edet2 1150 versus Ag/AgCl (3.0...
In this paper the determination of acetylsalicylic acid (ASA) in pharmaceutical formulations using square-wave voltammetry (SWV) and a boron-doped diamond electrode (BDD) is described. By proposed method, ASA directly determined 0.01 mol L-1 H2SO4 solution without need previous time-consuming alkaline hydrolysis step. A single oxidation peak at potential 1.97 V vs. Ag/AgCl (3.0 KCl) with characteristics an irreversible reaction was obtained. The obtained analytical curve linear concentration...
Abstract A cathodically pretreated boron‐doped diamond electrode was used for the simultaneous anodic determination of ascorbic acid (AA) and caffeine (CAF) by differential pulse voltammetry. Linear calibration curves ( r =0.999) were obtained from 1.9×10 −5 to 2.1×10 −4 mol L −1 AA 9.7×10 −6 1.1×10 CAF, with detection limits 19 μmol 7.0 , respectively. This method successfully applied CAF in pharmaceutical formulations, results equal those using a HPLC reference method.
Abstract The determination of sildenafil citrate using differential pulse voltammetry and a cathodically pre-treated boron-doped diamond electrode is described. obtained analytical curve linear in the concentration range 7.3 × 10−7 − 10−6 mol L−1 0.1 H2SO4, with detection limit 6.4 L−1. proposed method, which fast simple to carry out, was successfully applied Viagra® pharmaceutical formulations, results close agreement (at 95% confidence level) those comparative HPLC method. Keywords:...
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...
A flow injection analysis (FIA) and multiple pulse amperometric detection (MPA) using a cathodically pretreated boron-doped diamond electrode (CPT-BDD) were employed for simultaneous determination of the antihypertensive drugs hydrochlorothiazide (HTZ) enalapril (ENP). dual-potential waveform as function time, previously optimized, was used: Edet.1 = + 1.50 V / 150 ms (pulse potential at which HTZ oxidized) Edet.2 1.80 oxidation both analytes – ENP occurs). The analytical curves presented...
The sweeteners aspartame and acesulfame-K were successfully determined in food products by coupling differential pulse voltammetry with an anodically pretreated boron-doped diamond electrode.