Eduardo Henrique Duarte
Universidade Estadual de Londrina
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Eduardo Henrique Duarte.
Talanta | 2014
Eduardo Henrique Duarte; William Pereira dos Santos; Felipe Fantinato Hudari; José Luiz Bott Neto; Elen Romão Sartori; Luiz Henrique Dall’Antonia; Arnaldo César Pereira; César Ricardo Teixeira Tarley
The present paper describes a novel, simple and reliable differential pulse voltammetric method for determining amitriptyline (AMT) in pharmaceutical formulations. It has been described for many authors that this antidepressant is electrochemically inactive at carbon electrodes. However, the procedure proposed herein consisted in electrochemically oxidizing AMT at an unmodified carbon nanotube paste electrode in the presence of 0.1 mol L(-1) sulfuric acid used as electrolyte. At such concentration, the acid facilitated the AMT electroxidation through one-electron transfer at 1.33 V vs. Ag/AgCl, as observed by the augmentation of peak current. Concerning optimized conditions (modulation time 5 ms, scan rate 90 mV s(-1), and pulse amplitude 120 mV) a linear calibration curve was constructed in the range of 0.0-30.0 μmol L(-1), with a correlation coefficient of 0.9991 and a limit of detection of 1.61 μmol L(-1). The procedure was successfully validated for intra- and inter-day precision and accuracy. Moreover, its feasibility was assessed through analysis of commercial pharmaceutical formulations and it has been compared to the UV-vis spectrophotometric method used as standard analytical technique recommended by the Brazilian Pharmacopoeia.
Analytical Letters | 2014
Débora Nobile Clausen; Eduardo Henrique Duarte; Elen Romão Sartori; Arnaldo César Pereira; César Ricardo Teixeira Tarley
A simple, low cost sensor was developed for the voltammetric determination of hydrogen peroxide in mouthwash and dental whitening gel based on multi-walled carbon nanotubes incorporated with hemin. The sensor showed electrocatalytic activity toward the reduction of hydrogen peroxide in 0.05 mol L−1 Tris-HCl buffer solution (pH 7.0) using cyclic voltammetry. The optimum composition of paste was 20:10:70% (m/m/m) (multi-walled carbon nanotubes:hemin:mineral oil). A linear plot of the square root of scan rate vs. cathodic peak current showed that reduction of hydrogen peroxide is diffusion controlled. Using linear sweep voltammetry, the analytical curve ranged from 0.2 up to 1.4 mmol L−1 (r = 0.9996) with a sensitivity of 3.62 × 10−2 mA mol−1 L. The limits of detection and quantification were found to be 12.5 µmol L−1 and 41.7 µmol L−1, respectively. The developed method was applied for hydrogen peroxide determination in dental formulations. The results were compared with a volumetric method as a reference technique. No significant differences at the 95% level (paired student t test) were observed, thus demonstrating the accuracy of the sensor for the analysis of real samples.
Química Nova | 2014
Eduardo Henrique Duarte; Felipe Augusto Gorla; Elen Romão Sartori; César Ricardo Teixeira Tarley
A simple and reliable voltammetric method is presented for the determination of amitriptyline using a boron-doped diamond electrode in 0.1 mol L-1 sulfuric acid solution as the support electrolyte. Under optimized differential pulse voltammetry conditions (modulation time 5 ms, scan rate 70 mV s-1, and pulse amplitude 120 mV), the electrode provides linear responses to amitriptyline in the concentration range 1.05 to 92.60 µmol L-1 and at a detection limit of 0.52 µmol L-1. The proposed method was successfully applied in pharmaceutical formulations, with results similar to those obtained using UV-vis spectrophotometric method as reference (at 95% confidence level), as recommended by the Brazilian Pharmacopoeia.Eduardo Henrique Duartea, Felipe Augusto Gorlaa, Elen Romão Sartoria e César Ricardo Teixeira Tarleya,b,* Departamento de Química, Centro de Ciências Exatas, Universidade Estadual de Londrina, Rodovia Celso Garcia Cid, PR 445 Km 380, 86050-482 Londrina – PR, Brasil Instituto Nacional de Ciência e Tecnologia de Bioanalítica, Departamento de Química Analítica, Instituto de Química, Universidade Estadual de Campinas, Cidade Universitária Zeferino Vaz s/n, 13083-970 Campinas – SP, Brasil
Química Nova | 2014
Eduardo Henrique Duarte; Felipe Augusto Gorla; Elen Romão Sartori; César Ricardo Teixeira Tarley
A simple and reliable voltammetric method is presented for the determination of amitriptyline using a boron-doped diamond electrode in 0.1 mol L-1 sulfuric acid solution as the support electrolyte. Under optimized differential pulse voltammetry conditions (modulation time 5 ms, scan rate 70 mV s-1, and pulse amplitude 120 mV), the electrode provides linear responses to amitriptyline in the concentration range 1.05 to 92.60 µmol L-1 and at a detection limit of 0.52 µmol L-1. The proposed method was successfully applied in pharmaceutical formulations, with results similar to those obtained using UV-vis spectrophotometric method as reference (at 95% confidence level), as recommended by the Brazilian Pharmacopoeia.Eduardo Henrique Duartea, Felipe Augusto Gorlaa, Elen Romão Sartoria e César Ricardo Teixeira Tarleya,b,* Departamento de Química, Centro de Ciências Exatas, Universidade Estadual de Londrina, Rodovia Celso Garcia Cid, PR 445 Km 380, 86050-482 Londrina – PR, Brasil Instituto Nacional de Ciência e Tecnologia de Bioanalítica, Departamento de Química Analítica, Instituto de Química, Universidade Estadual de Campinas, Cidade Universitária Zeferino Vaz s/n, 13083-970 Campinas – SP, Brasil
Journal of Electroanalytical Chemistry | 2013
Felipe Fantinato Hudari; Eduardo Henrique Duarte; Arnaldo César Pereira; Luiz Henrique Dall’Antonia; Lauro T. Kubota; César Ricardo Teixeira Tarley
Sensors and Actuators B-chemical | 2014
Camila Farinha Valezi; Eduardo Henrique Duarte; Guilherme Roberto Mansano; Luiz Henrique Dall’Antonia; César Ricardo Teixeira Tarley; Elen Romão Sartori
Electroanalysis | 2012
Eduardo Henrique Duarte; Lauro T. Kubota; César Ricardo Teixeira Tarley
Sensors and Actuators B-chemical | 2018
Eduardo Henrique Duarte; Juliana Casarin; Elen Romão Sartori; César Ricardo Teixeira Tarley
Microchemical Journal | 2016
Felipe Augusto Gorla; Eduardo Henrique Duarte; Elen Romão Sartori; César Ricardo Teixeira Tarley
Journal of Electroanalytical Chemistry | 2016
Renata Afonso; Ana Paula Pires Eisele; Jéssica Aparecida Serafim; Adriana Campano Lucilha; Eduardo Henrique Duarte; César Ricardo Teixeira Tarley; Elen Romão Sartori; Luiz Henrique Dall'Antonia