Chemical Radicals
Mostrando 1-12 de 110 artigos, teses e dissertações.
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1. Structural and Functional Stabilization of Sericin from Bombyx mori Cocoons in a Biopolysaccharide Film: Bioorigami for Skin Regeneration
Development and optimization of a bioorigami film with silk sericin was pursued for skin regeneration. Several formulations were produced, with varying integrated sericin contents, viz. 0, 1, 2, 5, 10, 20 and 50 mgsericin mLfilm-1. The physico-chemical characteristics of the bioorigami films produced were evaluated via infrared spectrophotometry, X-ray diffr
J. Braz. Chem. Soc.. Publicado em: 2020-04
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2. ELECTROCHEMICAL INCINERATION OF SHORT-CHAIN CARBOXYLIC ACIDS WITH NB‑SUPPORTED BORON DOPED DIAMOND ANODE: SUPPORTING ELECTROLYTE EFFECT INTO THE ELECTROGENERATED OXIDANT SPECIES (HYDROXYL RADICALS, HYDROGEN PEROXIDE AND PERSULFATE)
This work describes the electrochemical oxidation study of three short chain carboxylic acids (acetic, oxalic and formic 0.18 mol L-1) using different electrolysis conditions (electrolyte composition and current density) in an electrochemical reactor fitted with niobiumsupported/BDD electrode (Nb/BBD) as anode and titanium plate as cathode. The experiments w
Quím. Nova. Publicado em: 2020-03
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3. Anti-Helicobacter pylori and Anti-inflammatory Properties of Eugenia uniflora L.
Abstract Helicobacter pylori is a bacterium that reaches half of the world population and it’s recognized as the main cause of chronic gastritis and peptic ulcer. In this study, we evaluated the anti-H. pylori, antioxidant and immunomodulatory activities of the methanolic (MeOH) extract of Eugenia uniflora leaves and chemical profile. Anti-H. pylori activi
Braz. arch. biol. technol.. Publicado em: 20/12/2019
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4. Phyto- and Bio-Chemical evaluation of Diospyros kaki L. cultivated in Egypt and its biological activities
Resumo Diospyros kaki L. ou Costata é a principal variedade de caqui progressivamente consumida no mercado e exportação egípcia. O objetivo deste estudo foi investigar os efeitos bioprotetores do extrato alcoólico de frutos e folhas de D. kaki utilizando modelos de ratos “in vivo”. Extratos de éter de petróleo provenientes de frutos e folhas foram
Braz. J. Biol.. Publicado em: 05/08/2019
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5. BDD-Electrolysis of Oxalic Acid in Diluted Acidic Solutions
Boron doped diamond films (BDD) are the most studied electrocatalytic materials and their efficiency for removing organic compounds is attributed to their ability to produce a large amount of hydroxyl radicals by the electrolysis of water. However, some organic compounds are easy to degrade than others, as well as they also interact with BDD surface. Thus, i
J. Braz. Chem. Soc.. Publicado em: 04/07/2019
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6. Pulp Fibroblast Cell Apoptosis After Application of Hema Dentine Bonding Material with Ethanol and Water Solvent
Resumo Os principais materiais para adesão dentinária em restaurações de resina composta são o 2-hidroxietil metacrilato (HEMA). O HEMA possui propriedades físicas e químicas benéficas e estáveis, ainda que tóxicas. A adição de etanol ou água pode reduzir o efeito tóxico do HEMA. O solvente etanol possui uma menor capacidade de ligação H em c
Braz. Dent. J.. Publicado em: 03/06/2019
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7. Amino acid concentration, total phenolic compound content and antioxidant activity of snap bean genotypes
Resumo O feijão-vagem (Phaseolus vulgaris L.) é uma leguminosa economicamente importante em todo o mundo, devido à sua boa qualidade nutricional, considerada fonte de proteínas, fibras, vitaminas e minerais. Além disso, esta hortaliça apresenta altos níveis de compostos fenólicos e atividade antioxidante, fatores que contribuem para a prevenção con
Braz. J. Food Technol.. Publicado em: 25/04/2019
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8. The Effect of Red Pigment and Photo Stabilizers on the Photo Degradation of Polypropylene Films
The aim of this work was to evaluate the photo degradation of PP films containing photo stabilizers, a ultraviolet absorber and a hindered amine light stabilizer (HALS), and a red pigment. The films were produced by extrusion and exposed to the UV radiation in the laboratory for up to 15 weeks. The results obtained from FTIR, UV-vis and colorimetry showed th
Mat. Res.. Publicado em: 11/04/2019
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9. Determination of the Antioxidant Capacity of Red Fruits by Miniaturized Spectrophotometry Assays
Natural sources with high antioxidant capacity represent an interesting potential to prevent or minimize the oxidative stress that causes many chronic diseases. The antioxidant capacity of red fruits (strawberry and cherry) was evaluated by miniaturized spectrophotometric methods 2,2’-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid) (ABTS), 2,2-diphenyl-1-
J. Braz. Chem. Soc.. Publicado em: 08/04/2019
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10. ENTRE TIPOS E RADICAIS: A CONSTRUÇÃO DO CONCEITO DE VALÊNCIA
This paper presents a historical case study regarding the development of the concept of valence in late nineteenth and early twentieth centuries. The case study focuses on Edward Frankland’s contribution to the process which lead to the convergence of two theories about the combination of the elements: the theory of types and the theory of radicals. Result
Quím. Nova. Publicado em: 2019-01
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11. Degradación de un efluente textil real asistida por Fe/PVA y materiales residuales magnéticos
ABSTRACT Organic compounds present on industrial wastes are mostly resistant to conventional biological and chemical treatments. Textile industry has presented several environmental problems mainly related to the use and management of water resources. It has a high consumption of potable and underground water in its processes. These wastewaters are one of th
Matéria (Rio J.). Publicado em: 19/07/2018
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12. PHENOLIC DERIVATIVES AND ANTIOXIDANT ACTIVITY OF POLAR EXTRACTS FROM Bauhinia pulchella
A tea made with the leaves or stem bark of Bauhinia pulchella Benth (Fabaceae) is used in the treatment of diabetes. Ethanol (EEF) and aqueous (EAF) extracts were obtained from the leaves and the antioxidant and citotoxic activities were tested, as well as quantify the content of flavonoids and phenolic compounds (TPC). EEF and EAF showed similar profiles by
Quím. Nova. Publicado em: 2018-04