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Título: | Antioxidant activity of (+)-bergenin-a phytoconstituent isolated from the bark of Sacoglottis uchi Huber (Humireaceae) |
Autor: | Abreu, Heitor Avelino de Aparecida Dos, Izandina Souza, Gilmar P. Piló?-Veloso, Dorila Duarte, Hélio Anderson Alcântara, Antônio Flávio de C. |
Palavras-chave: | Nuclear Magnetic Resonance Amazon Region Anti-oxidant Activities Bergenin Fenton System Theoretical Calculations Health Antioxidant Benzopyran Derivative Bergenin Beta Carotene Biphenyl Derivative Diphenyl-p-picrylhydrazyl Diphenyl-p-picrylhydrazyl Hydrazine Derivative Hydroxyl Radical Plant Extract Bark Chemical Structure Chemistry Computer Simulation Spectrophotometry, Infrared Malpighiaceae Mass Fragmentography Medicinal Plant Nuclear Magnetic Resonance Spectroscopy South America Stereoisomerism Antioxidants Benzopyrans Beta Carotene Biphenyl Compounds Computer Simulation Gas Chromatography-mass Spectrometry Hydrazines Hydroxyl Radical Magnetic Resonance Spectroscopy Malpighiaceae Molecular Structure Plant Bark Plant Extracts Plants, Medicinal South America Spectrophotometry, Infrared Stereoisomerism Sacoglottis |
Data do documento: | 2008 |
Revista: | Organic and Biomolecular Chemistry |
É parte de: | Volume 6, Número 15, Pags. 2713-2718 |
Abstract: | (+)-Bergenin (1) was isolated from Sacoglottis uchi, a species of vegetable found in the Amazon region and popularly used for the treatment of several hepatic problems. The structure of 1 was fully characterized using IR, GC-MS and NMR (1D and 2D) analyses. This phytoconstituent has been used as an oriental folk medicine for the treatment of many diseases and shows antihepatotoxic properties. Tests with β-carotene, DPPH and a heterogeneous Fenton system were carried out, confirming the antioxidant activity of 1. Theoretical calculations were performed to investigate the formation of the radical derivatives of 1 using ̇H, ̇OH, ̇CH3, and ̇CCl 3 as initiator radicals. DFT thermodynamic calculations showed that the methoxyl group (O-6-CH3) is the most favorable site for radical attack. Frontier molecular orbital analysis showed that nucleophilic radical attack is favored on the aromatic ring of 1 where the LUMO is localized, with antibonding character with respect to the O-6-CH3 bond. The possibilities of attack at other sites on 1 were investigated in detail in order to understand the regiospecificity of this reaction. © The Royal Society of Chemistry. |
DOI: | 10.1039/b804385j |
Aparece nas coleções: | Artigos |
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