Radical Anion
Mostrando 1-12 de 138 artigos, teses e dissertações.
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1. Voltammetric Generation and Kinetic Stability of Nitro Anion Radical from Nitrofurazone in Ionic Liquids
The nitrofurazone (NF) electrochemical reduction has been studied by cyclic voltammetry (CV) and square wave voltammetry (SWV) in non-aqueous medium using three different ionic liquids (IL): BMImTf2N, BMImBF4 and BMMImTf2N, having a carbon fiber microelectrode as working electrode. In all of them, two reversible cathodic peaks were recorded for NF. Under hig
J. Braz. Chem. Soc.. Publicado em: 2021-04
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2. INSIGHT INTO THE EFFECTS OF BAY-SUBSTITUENTS ON STABLE PERYLENE DIIMIDE RADICAL ANION SALTS
In previous work, the facile method to prepare perylene diimide radical anion salt by alkali treatment was reported. However, the effects of structure on synthetic process of perylene diimide radical anion salt, and the difference of response to Cu 2+ are not thoroughly understood. In this work, two bay-substituted perylene diimide derivatives radical anion
Quím. Nova. Publicado em: 2020-09
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3. Diethyl Selenodiglycolate: An Eco-Friendly Synthetic Antioxidant with Potential Application to Inflammatory Disorders
This study describes a single step, high yield and purity, ecofriendly and scalable procedure to prepare a selenium derivative (diethyl selenodiglycolate). Diethyl selenodiglycolate rapidly reduces hypochlorous acid (HOCl, second-order rate constant of 7 × 107 M−1 s−1) to generate its corresponding selenoxide. In activated HL-60 cells, diethyl selenodig
J. Braz. Chem. Soc.. Publicado em: 2020-06
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4. Medicinal Electrochemistry of Halogenated and Nitrated Pterocarpanquinones
Electrochemical methods are considered useful tools for simulations of biological redox reactions. The activities of quinones depend on their bioreduction. Biologically active pterocarpanquinones LQB-149 (nitroderivative), 150 and 151 (bromo and chloroderivatives, respectively) were electrochemically investigated by cyclic voltammetry, differential pulse vol
J. Braz. Chem. Soc.. Publicado em: 24/10/2019
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5. Fatty acid composition of vegetable oil blend and in vitro effects of pharmacotherapeutical skin care applications
Vegetable oils have been used for a plethora of health benefits by their incorporation in foods, cosmetics, and pharmaceutical products, especially those intended for skin care. This study aimed to investigate the cutaneous benefits of a vegetable oil blend (VOB) formulation and its fatty acid composition. The anti-inflammatory activity was studied in macrop
Braz J Med Biol Res. Publicado em: 14/02/2019
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6. Isolation and characterization of flavanols from Anthocephalus cadamba and evaluation of their antioxidant, antigenotoxic, cytotoxic and COX-2 inhibitory activities
ABSTRACT In search of lead molecules for use in disease prevention and as food additive from natural sources, two flavanols were isolated from leaves of Anthocephalus cadamba (Roxb.) Miq., Rubiaceae. Their structures were established as 6-hydroxycoumarin-(4"→8)-(-)-epicatechin and 6-hydroxycoumarin-(4"→8)-(-)-epicatechin-(4→6‴)-(-)-epicatechin on the
Rev. bras. farmacogn.. Publicado em: 2016-08
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7. Antioxidant, DNA damage protective, neuroprotective, and α-glucosidase inhibitory activities of a flavonoid glycoside from leaves of Garcinia gracilis
Abstract The leaves of Garcinia gracilis Pierre, Clusiaceae, have been used as flavouring materials in food, with no previous reports of their biological activities and chemical constituents. In this study, the methanolic extract of G. gracilis afforded three compounds namely apigenin-8-C-α-L-rhamnopyranosyl-(1→2)-β-D-glucopyranoside (1), 5-hydroxymethyl
Rev. bras. farmacogn.. Publicado em: 2016-06
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8. Antioxidant activities and lutein content of 11 marigold cultivars (Tagetes spp.) grown in Thailand
Antioxidant activities and total phenolic content (TPC) were analyzed in ethanol extracts of 11 marigold cultivars grown in Thailand. Antioxidant activity assays performed in this study were the 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) (ABTS) radical cation scavenging activity, ferric ion reducing antioxidant power (FRAP), 2,2-diphenyl-1-picry
Food Sci. Technol. Publicado em: 2015-04
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9. Resistance of oxidative stress in biofilm and planktonic cells
This work studied the susceptibility of biofilm produced by E. coli to oxidative stress, and compared the components of free radicals defences: level of glutathione, catalase and dismutase activities in planktonic and biofilm located cells. Results showed the diversity of responses to oxidative stress in bacterial cells in log or stationary phases in both pl
Braz. arch. biol. technol.. Publicado em: 2015-04
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10. Comparison of the antioxidant potential of antiparkinsonian drugs in different in vitro models
A doença de Parkinson (DP) é caracterizada pela degeneração progressiva dos neurônios dopaminérgicos na substância negra pars compacta. Além disso, o estresse oxidativo, presente nesta doença, causa ou contribui para o processo neurodegenerativo. Atualmente, a DP tem apenas tratamento sintomático e ainda nada pode ser feito para interromper o proce
Braz. J. Pharm. Sci.. Publicado em: 2014-12
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11. Antioxidant activities of kombucha prepared from three different substrates and changes in content of probiotics during storage
Kombucha is a health-promoting fermented beverage worldwide. The present study compared the free-radical scavenging abilities and total reducing power (TRP) of kombucha prepared from low-cost green tea (LGTK), black tea (BTK), and tea powder (TPK). LGTK had the highest scavenging abilities against 2,2-diphenyl-1-picrylhydrazyl (DPPH), superoxide anion and hy
Food Sci. Technol. Publicado em: 25/03/2014
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12. Nitrofurazone and its nitroheterocyclic analogues: a study of the electrochemical behavior in aqueous medium
A compreensão do mecanismo de redução de compostos com potencial atividade antichagásica pode contribuir para o melhor entendimento de sua ação biológica. Com este objetivo, a redução eletroquímica de nitrofural (nitrofurazona, NF) e seus análogos, nitrofurfurilideno tiossemicarbazona (NFS), nitrotiofeno semicarbazona (NT), nitrotiofeno tiossemica
J. Braz. Chem. Soc.. Publicado em: 2013-12