Amperometric Analysis
Mostrando 1-12 de 50 artigos, teses e dissertações.
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1. Additive Manufacturing towards the Fabrication of Greener Electrochemical Sensors for Antioxidants
Additive manufacturing is an emerging tool that has contributed to the sustainable fabrication of devices in several areas based on the concept of “zero waste”. Considering extrusion-based manufacturing (or 3D printing), polylactic acid (PLA) has been highlighted due to its biodegradability, obtention from renewable sources, and compatibility for 3D prin
Journal of the Brazilian Chemical Society. Publicado em: 2022
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2. Molecularly Imprinted Polypyrrole on Glassy Carbon Electrode Modified with Reduced Graphene Oxide and Gold Nanoparticles for Isoamyl Alcohol Analysis in Fusel Oil
A molecularly imprinted electrochemical sensor for determination of isoamyl alcohol was successfully constructed by modifying the glassy carbon electrode (GCE) with gold nanoparticles (AuNPs) and reduced graphene oxide (RGO). The modification of the GCE increased the electron transfer rate and the electrode surface area, which, consequently, made more room a
J. Braz. Chem. Soc.. Publicado em: 2021-02
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3. Synthesis, Characterization, Spectroelectrochemical, Photophysical and HSA-Binding Properties of Novel and Versatile meso-Tetra(4-pyridylvinylphenyl)porphyrins Coordinated to Ruthenium(II)-Polypyridyl Derivatives
The free-base meso-tetra(4-pyridylvinylphenyl)porphyrin (1a) and its zinc(II) complex were synthesized and then functionalized with [Ru(bpy)2Cl]+ units (2a and 2b) via conventional methods and evaluated in terms of photophysical, electrochemical and biological aspects. All porphyrins present moderate singlet oxygen production and fluorescence quantum yield,
J. Braz. Chem. Soc.. Publicado em: 2020-11
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4. New Detector Based on Composite of Carbon Nanotubes with Nanoparticles of Cobalt Oxide for Carbohydrates Analysis by HPLC with Reverse Pulsed Amperometric Detection
This work aims to present an alternative detector for the determination of arabinose, galactose, glucose and xylose in hydrolyzed sugarcane bagasse. The detector was developed using an electrode modified with multi-walled carbon nanotubes containing cobalt oxide nanoparticles (GCE/MWCNT/CoOOH) applied in high-performance liquid chromatography (HPLC) with rev
J. Braz. Chem. Soc.. Publicado em: 2020-03
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5. DETERMINAÇÃO RÁPIDA E SIMULTÂNEA DE PROPIFENAZONA, PARACETAMOL E CAFEÍNA UTILIZANDO ANÁLISE POR INJEÇÃO EM BATELADA COM DETECÇÃO AMPEROMÉTRICA
A fast and simple procedure for simultaneous determination of propyphenazone (PRO), paracetamol (PAR) and caffeine (CAF) was performed using batch injection analysis with multiple pulse amperometric detection (BIA-MPA). Three potentials pulses were selected for the analysis: +0.90 V/50 ms: only PAR was oxidized; +1.20 V/50 ms: oxidation of PAR and PRO withou
Quím. Nova. Publicado em: 2017-10
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6. Batch-Injection Amperometric Determination of Pyrogallol in Biodiesel Using a Multi-Walled Carbon Nanotube Modified Electrode
This work demonstrates the application of batch-injection analysis (BIA) with amperometric detection on a multi-walled carbon nanotube (MWCNT) modified electrode for the sensitive determination of the antioxidant pyrogallol in biodiesel. Samples were diluted in electrolyte (0.1 mol L-1 HClO4) before injection using an electronic micropipette on the BIA cell.
J. Braz. Chem. Soc.. Publicado em: 2017-09
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7. DETERMINAÇÃO RÁPIDA E SIMPLES DE CITRATO DE SILDENAFILA (VIAGRA® E GENÉRICOS) EMPREGANDO ELETRODO IMPRESSO DE CARBONO EM SISTEMAS FIA E BIA COM DETECÇÃO AMPEROMÉTRICA
This work presents two amperometric methods for Sildenafil Citrate (SC) determination in erectile dysfunction drugs (Viagra® and Generics), using Batch Injection Analysis (BIA) and Flow Injection Analysis (FIA) systems with a cell for Screen Printed Electrodes (SPE). In Britton- Robinson buffer solution (pH 2), the SC presented an irreversible anodic peak a
Quím. Nova. Publicado em: 2017-08
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8. AMPEROMETRIC DETERMINATION OF 8-CHLOROTHEOPHYLLINE, CAFFEINE, AND DIPHENHYDRAMINE IN A SINGLE RUN
A simple method for simultaneous determination of 8-chlorotheophylline (CTP), caffeine (CAF), and diphenhydramine (DIP) using batch-injection analysis with multiple pulse amperometric detection (BIA-MPA) is reported. A sequence of three potential pulses (+1.10 V, +1.40 V, and +1.70 V) was applied to the boron-doped diamond working electrode with the acquisit
Quím. Nova. Publicado em: 2017-08
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9. Physico-chemical properties and amino acid profiles of sap from Tunisian date palm
ABSTRACT Date palm sap (Phoenix dactylifera L.), also known as “legmi”, is a fresh juice extracted from date palm trees. The present study aimed to elucidate the effects of collection time (at the beginning of the tapping period and after seven days of collection) on the amino acid profile and physico-chemical properties of date palm sap from both male a
Sci. agric. (Piracicaba, Braz.). Publicado em: 2016-02
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10. Biomimetic Sensor for Detection of Hydrochlorothiazide Employing Amperometric Detection and Chemometrics for Application in Doping in Sports
This work describes a simple and cost-effective method for quantitative determination of hydrochlorothiazide using biomimetic sensor based on a carbon paste modified with hemin (biomimetic catalyst of the P450 enzyme). The sensor was evaluated using cyclic voltammetry and amperometry for its electrochemical characterization and quantification, respectively.
J. Braz. Chem. Soc.. Publicado em: 2015-10
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11. DETERMINAÇÃO RÁPIDA E SIMULTÂNEA DE SULFAMETOXAZOL E TRIMETOPRIMA UTILIZANDO ANÁLISE POR INJEÇÃO EM BATELADA COM DETECÇÃO AMPEROMÉTRICA E ELETRODO DE DIAMANTE DOPADO COM BORO
A fast, simple procedure for simultaneous determination of sulfamethoxazole (SMX) and trimethoprim (TMP) was performed using batch injection analysis with multiple pulse amperometric detection (BIA-MPA). The sample aliquot (150 µL) was directly injected onto the boron-doped diamond (BDD) electrode (wall-jet configuration) immersed in a BIA system. The an
Quím. Nova. Publicado em: 2015-06
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12. Flow injection analysis with amperometric detection for morpholine determination in corrosion inhibitors
Neste estudo, um método eletroquímico é proposto utilizando análise por injeção em fluxo e detecção amperométrica com eletrodos impressos de carbono para determinação de morfolina com intuito de monitorar a qualidade de inibidores de corrosão à base de morfolina e a concentração residual de inibidores que controlam a corrosão interna em dutos
J. Braz. Chem. Soc.. Publicado em: 2014-08