Pyrogallol
Mostrando 1-12 de 45 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. Synthesis of New Phenolic-Schiff Base and Its Application as Antioxidant in Soybean Biodiesel and Corrosion Inhibitor in AISI 1020 Carbon Steel
New Schiff base compound N, N’-bis-(4-hexadecanate)-salicylethylenediamine (named IM) was synthesized, and characterized via infrared and nuclear magnetic ressonance spectroscopies. IM was tested as corrosion inhibitor and antioxidant in soybean biodiesel. Corrosion studies were developed with AISI 1020 carbon steel in a three-step accelerated corrosion as
J. Braz. Chem. Soc.. Publicado em: 2020-03
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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. 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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5. Estudos de culturas e atividade ligninolítica de alguns políporos (Basidiomycota) da Mata Atlântica brasileira, São Paulo, SP, Brasil
RESUMO Durante um levantamento de fungos na Mata Atlântica brasileira do Estado de São Paulo, SP, Brasil, fungos poroides crescendo em madeira em decomposição foram coletados e fragmentos dos basidiomas foram utilizados para obter culturas puras. Um total de 37 isolados foram obtidos e identificados em 23 espécies. Características das culturas de Bjerk
Hoehnea. Publicado em: 2016-06
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6. Optimization of solvent mixtures for extraction from bark of Schinus terebinthifolius by a statistical mixture-design technique and development of a UV-Vis spectrophotometric method for analysis of total polyphenols in the extract
A statistical mixture-design technique was used to study the effects of different solvents and their mixtures on the yield, total polyphenol content, and antioxidant capacity of the crude extracts from the bark of Schinus terebinthifolius Raddi (Anacardiaceae). The experimental results and their response-surface models showed that ternary mixtures with equal
Quím. Nova. Publicado em: 2014
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7. Development of a UV/Vis spectrophotometric method for analysis of total polyphenols from Caesalpinia peltophoroides Benth
Caesalpinia peltophoroides is a domesticated tree found in Brazil. It was necessary to develop an analytical method to determine the content of total polyphenols (TP) in this herbal drug. The pre-analytical method was standardized for analysis time, wavelength, and the best standard to use. The optimum conditions were: pyrogallol, 760 nm, and 30 min respecti
Química Nova. Publicado em: 2012
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8. Molecular structure-affinity relationship of dietary flavonoids for bovine serum albumin
The relationship between the molecular structure of dietary flavonoids and their affinities for bovine serum albumin (BSA) were fully investigated by fluorescence titration analysis. The binding process with BSA was significantly affected by the molecular structure of flavonoids under study. The methylation of hydroxyl group in flavonoids enhanced their bind
Revista Brasileira de Farmacognosia. Publicado em: 08/07/2011
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9. Influência do contra-íon usado na eletrossíntese do polipirrol em sua resposta como biossensor eletroquímico após a imobilização da polifenol oxidase / Influence of counter-ion used in the electrosynthesis of polypyrrole in your response as electrochemical biosensors after polyphenol oxidase immobilization
Neste trabalho, foram fabricados biossensores amperométricos a partir do uso da polifenol oxidase (PFO), obtida do abacate como fonte enzimática, imobilizada em filmes de polipirrol (PPI) e que foram eletrossintetizados em meio de três diferentes eletrólitos de suporte (NaCl e NaClO4 e NaDDS). O método de imobilização enzimática foi o da adsorção,
Publicado em: 2009
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10. Isolamento e identificação de Klebsiella de solo de cerrado e o uso de suas enzimas para modificação química de fungicidas / Isolation and identification of Klebsiella in cerrado soil and its use of enzymes for chemical modification of fungicides
In this research, open ground samples (Brazilian Savannah Cerrado) proceeding from treated cultures of soy with Opera (epoxiconazol and piraclostrobin) had been used as source of resistant microorganisms to fungicide. The sample were collected in July 2006, in three points of planted area and two depths, 0 to 20 cm, and from 80 cm to 1m, next to the state hi
Publicado em: 2008
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11. Oxido de titanio (IV) hidratado disperso na superficie da x-celulose : preparação, caracterização e aplicações
The interation of titanium chloride with a-cellulose surface and the modifications introduced on the morphology were studied by means of scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The chemical analysis of the surface was carried out by X-ray photoelectron spectroscopy (XPS) and changes in the crystallinity upon chemical trea
Publicado em: 1996
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12. Reavaliação de metodos analiticos e determinação da composição de carotenoides e valor da vitamina A em mamão e caja
Due to conflicting results and lack of definitions still existing in terms of the adequate methodology for determination of carotenoids and vitamin A value of fruits and vegetables, the more controversial steps of the analytical procedure were studied-Utilizing kale as test material, the efficiency of common extracting solvents was assessed. Samples extracte
Publicado em: 1989