Electroanalytical Methods
Mostrando 1-12 de 20 artigos, teses e dissertações.
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1. 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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2. AVALIAÇÃO DE NANOTUBOS DE CARBONO FUNCIONALIZADOS VISANDO O DESENVOLVIMENTO DE MÉTODOS DE PRÉ-CONCENTRAÇÃO DE ÍONS METÁLICOS E DETERMINAÇÃO POR TÉCNICAS ESPECTROMÉTRICAS E ELETROANALÍTICAS
This review focuses on the use of functionalized carbon nanotubes (CNTs) on the development of preconcentration methods with substantial contributions on selectivity and sensitivity for metal ions determination. CNTs have been usually employed in the development of preconcentration/speciation coupled to spectroanalytical techniques for ions determination at
Quím. Nova. Publicado em: 2020-09
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3. Antioxidant and Vasodilatory Action of Grape Juices Produced in Different Regions of Brazil
Abstract Background: Grapes and its derivatives (wines and juices) are rich in polyphenols that have high antioxidant and vasodilator capacity. These biological activities may vary in the juices marketed and produced in different regions of Brazil. Objectives: To determine the antioxidant and vasorelaxant effects of grape juice samples produced in differen
Int. J. Cardiovasc. Sci.. Publicado em: 21/01/2019
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4. Antioxidant activity evaluation of dried herbal extracts: an electroanalytical approach
ABSTRACT The prevention of chronic and degenerative diseases, is a health concern deeply associated with oxidative stress. Such progressive phenomena can be avoided through exogenous antioxidant intake, which set up a reductant cascade, mopping up damaging free radicals. Medicinal herbs are commonly associated with high antioxidant potential, and hence their
Rev. bras. farmacogn.. Publicado em: 2018-06
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5. COMPOSTOS ORGÂNICOS E INORGÂNICOS CONTENDO SELÊNIO: REVISÃO DE MÉTODOS ANALÍTICOS E PERSPECTIVAS PARA ANÁLISES QUÍMICAS
This article critically reviews the spectrometric, chromatographic and electroanalytical methods applied for the identification and quantification of organic and inorganic compounds containing Se and their applications in food, biological and natural water samples. The main characteristics, advantages and disadvantages of each analytical method are presented
Quím. Nova. Publicado em: 2017-10
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6. PANORAMA DA ELETROQUÍMICA E ELETROANALÍTICA NO BRASIL
Electrochemistry and Electroanalytical chemistry play an important role to face the challenges of the contemporary world. They have contributed to the advance of the scientific development of our country, helped to promote economic and social progress as well as cultural dissemination. These areas have greatly contributed to the knowledge about thermodynamic
Quím. Nova. Publicado em: 2017-07
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7. Sinais de fundo em análise instrumental: uma discussão essencial em cursos de graduação
Understanding instrumental analysis is essential for obtaining reliable analytical results required by chemists in a variety of research areas and industrial activities. All instrumental techniques involve undesirable background (BG) signals originated either from concomitants in the sample or by spurious (e.g. electrical or optical) effects intrinsically re
Quím. Nova. Publicado em: 2017-02
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8. Square-Wave Voltammetric Determination of Paracetamol and Codeine in Pharmaceutical and Human Body Fluid Samples Using a Cathodically Pretreated Boron-Doped Diamond Electrode
Simple, fast, and inexpensive electroanalytical procedures were developed for the determination of codeine (COD) solely and paracetamol (PCT) and COD simultaneously in pharmaceutical formulations and human body fluids. The methods involve the combination of square-wave voltammetry (SWV) with a cathodically pretreated boron-doped diamond electrode and a 0.2 m
J. Braz. Chem. Soc.. Publicado em: 2015-10
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9. Investigação do comportamento eletroquímico do inseticida fipronil e desenvolvimento de metodologia eletroanalítica / Investigation of the electrochemical behavior of the insecticide fipronil and development of electroanalytical methodology
Essa tese de doutorado apresenta o estudo eletroquímico da oxidação do inseticida fipronil bem como o desenvolvimento de metodologias analíticas para a determinação deste composto em amostras de águas naturais. Os experimentos foram realizados sobre os eletrodos de compósito grafite-poliuretana (GPU) e carbono vítreo modificado com nanotubos de carb
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/05/2012
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10. Desenvolvimento de procedimentos eletroanalíticos para a determinação de antioxidantes e corantes em produtos alimentícios empregando um eletrodo de diamante dopado com boro / Development of electroanalytical procedures for the determination of antioxidants and colorants in food samples using a boron-doped diamond electrode
The following topics were investigated in this thesis: a) the electrochemical response of a boron-doped diamond electrode, after different electrochemical pretreatments, for two antioxidants (butylated hydroxyanisole BHA and butylated hydroxytoluene BHT) and three food colorants (tartrazine TT, sunset yellow SY, and brilliant blue BB); b) the development of
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/04/2011
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11. Simultaneous determination of pesticides used electroanalytical methods and chemometri methods / Determinação simultanêa de pesticidas utilizando métodos eletroanalíticos e quimiométricos
This paper describes the simultaneous determination of the pesticides paraquat and diquat using electroanalytical techniques coupled with chemometric methods. Although these two pesticides can be easily determined in trace levels, the same does not apply to mix due to a large overlap of the voltammetric peaks. For this reason it became necessary to treat the
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/03/2011
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12. Determinação simultânea de íons metálicos utilizando voltametria de redissolução anódica e métodos de calibração multivariada / Simultaneous determination of íons in solution using anodic stripping voltametry and multivariate analysis.
This work describes the determination of Cu2+, Cd2+, Pb2+, Zn2+ and Co2+ using electroanalytical techniques and analyzing the data with chemometric tools. First, an univariate approach was used to investigate RMSEParately each ion using anodic stripping voltammetry in two different concentration range, mg L-1 and μg L-1. Then, the voltammetric profiles
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/10/2010