Modified Composite Graphite Electrode
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. Graphite-Polyurethane Composite Electrode Modified with Molecularly Imprinted Polymer for Determination of Diclofenac
A molecularly imprinted polymer (MIP) was prepared using the anti-inflammatory diclofenac (DCF) as a template. A non-imprinted polymer (NIP) was also prepared as a control. These MIP and NIP were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Brunauer-Emmett-Teller (BET), revealing a higher porosity in the fir
Journal of the Brazilian Chemical Society. Publicado em: 2022
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2. Evaluation of a Graphite-Polyurethane Composite Electrode Modified with Copper Nanoparticles as an Amperometric Flow Detector in a Wall-Jet System for the Determination of Cysteine
A graphite-polyurethane composite electrode (GPUE) was modified by electrodeposition of copper nanoparticles (CuNP) followed by electrochemical treatment in NaOH (GPUE-CuNP), in order to prepare an amperometric sensor for the determination of cysteine (Cys). Cyclic votammograms of Cys solutions at GPUE-CuNP allowed the description of a sequence of electroche
J. Braz. Chem. Soc.. Publicado em: 2020-02
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3. Silica/Titania Graphite Composite Modified with Chitosan and Tyrosinase Employed as a Sensitive Biosensor for Phenolic Compounds
A mesoporous, high surface area and conductive silica/titania graphite composite modified with chitosan and functionalized with tyrosinase was prepared. The composite was obtained by the sol-gel method and the surface of the resultant material was modified with chitosan solutions containing 5, 10 and 15% by mass. The textural characterization showed that eve
J. Braz. Chem. Soc.. Publicado em: 24/10/2019
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4. A New Electrochemical Platform Based on a Polyurethane Composite Electrode Modified with Magnetic Nanoparticles Coated with Molecularly Imprinted Polymer for the Determination of Estradiol Valerate in Different Matrices
A polyurethane composite electrode modified with magnetic nanoparticles (mag; Fe3O4) coated with molecularly imprinted polymers (MIPs) was developed for the electrochemical determination of estradiol valerate. Chemical and morphological analyses of the mag-MIP were performed using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (E
J. Braz. Chem. Soc.. Publicado em: 24/10/2019
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5. Using of a graphite-polyurethane composite electrode modified with a Schiff base as a bio-inspired sensor in the dopamine determination
Um eletrodo compósito sólido à base de grafite e resina poliuretana modificado com um complexo de base de Schiff do tipo tetradentada simétrica, N, N'-bis(salicilideno)etilenodiamino de cobre(II) ([Cu(II)Salen)]), foi avaliado como sensor bio-inspirado, usando dopamina (DA) como sonda eletroquímica. O comportamento voltamétrico do modificador [Cu(II)Sa
J. Braz. Chem. Soc.. Publicado em: 2014-06
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6. Determinação de peróxido de hidrogênio em antisséptico bucal usando um microdispositivo contendo partículas de Azul da Prússia
A simple flow-injection amperometric procedure using a three-electrode-integrated sensor for the determination of H2O2 in antiseptic mouthwash is reported. This method involves the use of a working composite electrode modified with Prussian Blue (PB) particles that was easily adapted as detector in FIA. The best amperometric response was observed for a compo
Química Nova. Publicado em: 2011
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7. Desenvolvimento, caracterização e aplicação eletroanalítica de um compósito fluido de adesivo epóxi, grafite e ciclo-hexanona
A fluid conducting composite material prepared from graphite powder, commercial epoxy resin Araldite®, and cyclohexanone has been developed. The composition was optimized considering the mechanical properties as conductivity and adhesiveness using response surface methodology. This work employed cyclic voltammetry and amperometry to investigate the characte
Química Nova. Publicado em: 2010
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8. Funcionalization of mesoporous silica with 2-bezothiazolethiol and 3-mercaptopropyltrimetoxysilane for electronalytical application / Funcionalização de sílicas mesoporosas com benzotiazol-2-tiol e 3-mercaptopropiltrimetoxisilano para aplicações em eletroanalítica
Mesoporous silicas were functionalised by immobilisation of organic substances covalently bonded to the silanol groups on the silica surface. SBA-15 nanostructured silica was functionalised by post-synthesis with 2-benzothiazolethiol and silica films modified with 3-mercaptopropyltrimethoxysilane were obtained by direct functionalisation. The characterizatio
Publicado em: 2009
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9. Amperometric biosensor based on tyrosinase applied for the indirect determination of traces of pesticides / Biossensor amperométrico à base de tirosinase aplicado na determinação de compostos orgânicos em amostras ambientais
An amperometric biosensor based on tyrosinase enzyme was developed and investigated for monitoring of Parathion Methyl, Carbaryl, Carbofuran and Diazinon. The enzyme was immobilized on a cobalt (II) phtalocyanine modified graphite composite electrode (CoPc-GCE) by cross-linking with glutaraldehyde and bovine serum albumin. Several parameters which affect the
Publicado em: 2005
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10. Amperometric biosensor based on tyrosinase applied for the indirect determination of traces of pesticides / Biossensor amperomÃtrico à base de tirosinase aplicado na determinaÃÃo de compostos orgÃnicos em amostras ambientais
Um biossensor amperomÃtrico baseado na enzima tirosinase foi desenvolvido e investigado para o monitoramento dos agrotÃxicos Metil Paration, Carbaril, Carbofuran e Diazinon. A enzima foi imobilizada sobre um eletrodo compÃsito de grafite modificado com ftalocianina de cobalto (II) (ECG-FtCo) por cross-linking com glutaraldeÃdo e albumina de soro bovino.
Publicado em: 2005