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Actividade antioxidante de cogumelos silvestres comestíveis: Leucopaxillus giganteus, Sarcodon imbricatus e Agaricus arvensis IPB - Escola Superior Agrária
Barros, Lillian; Queirós, Bruno; Ferreira, Isabel C.F.R.; Baptista, Paula.
Tipo: ConferenceObject
Ano: 2006 URL: http://hdl.handle.net/10198/3340
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Actividade antioxidante de cogumelos silvestres comestíveis: Leucopaxillus giganteus, Sarcodon imbricatus e Agaricus arvensis IPB - Escola Superior Agrária
Barros, Lillian; Queirós, Bruno; Ferreira, Isabel C.F.R.; Baptista, Paula.
Tipo: ConferenceObject
Ano: 2007 URL: http://hdl.handle.net/10198/3535
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In search of synergistic effects in antioxidant capacity of combined edible mushrooms IPB - Escola Superior Agrária
Queirós, Bruno; Barreira, João C.M.; Sarmento, Ana C.; Ferreira, Isabel C.F.R..
The antioxidant activity of different edible mushrooms was evaluated considering the different contribution of individual and combined extracts. The radical scavenging capacity was evaluated through hydrogen atom transfer and single electron transfer reaction-based assays: DPPH radical scavenging activity and reducing power, respectively. The inhibition of lipid peroxidation was studied in lipossomes solutions by the beta-carotene-linoleate system. Three types of interactions (synergistic, additive and negative synergistic effects) were observed, synergism being the most abundant effect. Marasmius oreades is present in the mixtures with higher antioxidant properties and synergistic effects, while Cantharellus cibarius is present in the mixtures with lowest...
Tipo: Article Palavras-chave: Mushrooms; Antioxidant activity; Phenolics; Synergism; Discriminant analysis.
Ano: 2009 URL: http://hdl.handle.net/10198/2647
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Total phenols, ascorbic acid, b-carotene and lycopene in Portuguese wild edible mushrooms and their antioxidant activities IPB - Escola Superior Agrária
Barros, Lillian; Ferreira, Maria João; Queirós, Bruno; Ferreira, Isabel C.F.R.; Baptista, Paula.
The antioxidant activities of three Portuguese wild edible mushroom species, Leucopaxillus giganteus, Sarcodon imbricatus, andAgaricus arvensis, were evaluated. Methanolic extracts were screened for their reducing power, 2,2-diphenyl-1-picrylhydrazyl (DPPH) radicalscavenging capacity, inhibition of erythrocytes hemolysis and antioxidant activity using the b-carotene linoleate model system. The amounts of ascorbic acid, b-carotene and lycopene found in the mushroom extracts were very low. Otherwise, the high contents of phenolic compounds might account for the good antioxidant properties found in all species. L. giganteus had the highest content of phenols and proved to be the most active, presenting lower EC50 values in all the antioxidant activity assays.
Tipo: Article Palavras-chave: Mushrooms; Antioxidants; Phenolics; Ascorbic acid; Beta-carotene; Lycopene.
Ano: 2007 URL: http://hdl.handle.net/10198/840
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