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| Barros, Lillian; Falcão, Soraia; Baptista, Paula; Freire, C.; Vilas-Boas, Miguel; Ferreira, Isabel C.F.R.. |
| The antioxidant activity of five Agaricus sp. mushrooms was screened through chemical, biochemical and electrochemical techniques. The chemical assays allowed an evaluation of their reducing power and radical scavenging activity, while biochemical assays evaluated the lipid peroxidation inhibition capacity, using erythrocytes and brain cells as models; the electrochemical characterization of the mushrooms extracts were performed by cyclic voltammetry and differential pulse voltammetry. All the species proved to have antioxidant activity and particularly, by the electrochemical techniques, it has been shown that mushroom extracts revealed similar electrochemical responses, suggesting similar electroactive chemical composition, and oxidation potentials more... |
| Tipo: Article |
Palavras-chave: Agaricus sp mushrooms; Electrochemical assays; Lipid peroxidation inhibition. |
| Ano: 2008 |
URL: http://hdl.handle.net/10198/814 |
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| Abreu, Rui M.V.; Falcão, Soraia; Ferreira, Isabel C.F.R.; Queiroz, Maria João R.P.; Vilas-Boas, Miguel. |
| Cyclic voltammetry was used to evaluate the antioxidant activity of 7-aryl or 7-heteroarylamino-2,3-dimethylbenzo[b]thiophenes previously synthesized by some of us, comparing their oxidation potentials with those of the well-known synthetic standards (BHA, BHT). Compounds with electron-donating groups on the arylamine moiety have lower Ep/2 than compounds with electron-withdrawing groups or electron-deficient rings (pyridines). The position of the methoxy group on the arylamine moiety also changes the oxidation potential: lower Ep/2 for the diarylamines with methoxy groups in the para position. Comparing the first peak potential with the ones of BHA and BHT, the diarylamine compounds show lower oxidation potential, and therefore higher reducing power. A... |
| Tipo: Article |
Palavras-chave: Benzo[b]thiophene; Diarylamines; Antioxidant properties; Electrochemical assays. |
| Ano: 2009 |
URL: http://hdl.handle.net/10198/2717 |
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