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Ordenar por: RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 6
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Bioactive properties and chemical composition of six walnut (Juglans regia L.) cultivars IPB - Escola Superior Agrária
Pereira, J.A.; Oliveira, I.; Sousa, A.; Ferreira, Isabel C.F.R.; Bento, Albino; Estevinho, Leticia M..
The chemical composition, antioxidant potential and antimicrobial activity were studied in six walnuts (Juglans regia L.) cultivars (cv. Franquette, Lara, Marbot, Mayette, Mellanaise and Parisienne) produced in Portugal. Concerning their chemical composition the main constituent of fruits was fat ranging from 78.83% to 82.14%, being the nutritional value around 720 kcal per 100 g of fruits. Linoleic acid was the major fatty acid reaching the maximum value of 60.30% (cv. Lara) followed by oleic, linolenic and palmitic acids. The aqueous extracts of walnut cultivars were investigated by the reducing power assay, the scavenging effect on DPPH (2,2-diphenyl-1-picrylhydrazyl) radicals and b-carotene linoleate model system. All the walnut extracts exhibited...
Tipo: Article Palavras-chave: Juglans regia L.; Fatty acids; Nutritional value; Antioxidant properties; Antimicrobial activity.
Ano: 2008 URL: http://hdl.handle.net/10198/778
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Exotic fruits as a source of important phytochemicals: improving the traditional use of Rosa canina fruits in Portugal IPB - Escola Superior Agrária
Barros, Lillian; Carvalho, Ana Maria; Ferreira, Isabel C.F.R..
Several exotic fruits are used in folk medicine as potential sources of healthy compounds. Rosa canina L. (dog rose) fruits and other parts used to be widely consumed in rural areas from Portugal. The present work intends to highlight the presence of bioactive compounds in those different parts, in order to improve their use based on scientific studies. The antioxidant activity was screened through: radical scavenging effects, reducing power, and inhibition of lipid peroxidation in brain homogenates. Phytochemical characterization included determination of sugars by HPLC-RI, fatty acids by GC-FID, tocopherols by HPLC-fluorescence, phenolics, flavonoids, carotenoids, chlorophylls and ascorbic acid, by spectrophotometric techniques. Galls revealed the...
Tipo: Article Palavras-chave: Rosa canina; Wild fruits; Phytochemicals; Antioxidant properties.
Ano: 2011 URL: http://hdl.handle.net/10198/6034
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Insights in the antioxidant activity of diarylamines from the 2,3-dimethylbenzo[b]thiophene by the redox profile IPB - Escola Superior Agrária
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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Phytochemical characterization and radical scavenging activity of Portulaca oleracea L. leaves and stems IPB - Escola Superior Agrária
Oliveira, I.; Valentão, P.; Lopes, R.; Andrade, P.B.; Bento, Albino; Pereira, J.A..
The present work aimed to proceed to the phytochemical characterization of purslane (Portulaca oleracea L.) and study of its antioxidant activity. Different samples were analyzed for their moisture and fat content, fatty acids, organic acids and phenolic compound composition and the scavenging effect of DPPH (2,2- diphenyl-1-picrylhydrazyl) radicals was evaluated. Water was the major constituent of purslane stems (average 90.5%) and leaves (average 91.8%), while fat values varied from 0.11% to 0.57%. Twenty seven fatty acids were found in the leaves samples, being linolenic acid the most abundant, ranging from 27.7 to 39.1%, followed by palmitic (19.3–24.3%) and oleic acids (11.6–19.5%). Five different organic acids were detected namely fumaric, aconitic,...
Tipo: Article Palavras-chave: Portulaca oleraceae L.; Fatty acids; Organic acids; Phenolic compounds; Antioxidant properties.
Ano: 2009 URL: http://hdl.handle.net/10198/3100
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Topical anti-inflammatory plant species: bioactivity of Bryonia dioica, Tamus communis and Lonicera peryclimenum fruits IPB - Escola Superior Agrária
Rafael, Marco; Barros, Lillian; Carvalho, Ana Maria; Ferreira, Isabel C.F.R..
The practice of rubbing different plant material juices or extracts into the skin to relieve pain and rheumatic symptoms is deeply rooted in folk medicine and has been used for a long time. Several common species, usually available in agroecosystems of the Iberian Peninsula, were/are used for topical medicinal preparations as reported in recent ethnobotanical surveys. Based on these studies, the fruits of three relevant species (Bryonia dioica or white-bryony, Lonicera periclymenum or common honeysuckle and Tamus communis or black-bryony) were gathered and different analyses and assays were performed in order to characterize their phytochemical composition and to find biologically active compounds for pharmaceutical application. Black-bryony ripened fruits...
Tipo: Article Palavras-chave: Medicinal fruits; Topical anti-inflammatory; Antioxidant properties; Bioactive compounds; Portuguese ethnobotany.
Ano: 2011 URL: http://hdl.handle.net/10198/6066
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Walnut (Juglans regia L.) leaves: phenolic compounds, antimicrobial activity ans antioxidant potential of different cultivars. IPB - Escola Superior Agrária
Pereira, J.A.; Oliveira, I.; Sousa, A.; Valentão, P.; Andrade, P.B.; Ferreira, Isabel C.F.R.; Ferreres, F.; Bento, Albino; Seabra, R.M.; Estevinho, Leticia M..
Different cultivars of walnut (Juglans regia L.) leaves (Cv. Lara, Franquette, Mayette, Marbot, Mellanaise and Parisienne) grown in Portugal, were investigated in what concerns phenolic compounds and antimicrobial and antioxidant properties. Phenolics analysis was performed by reversed-phase HPLC/DAD and 10 compounds were identified and quantified: 3- and 5-caffeoylquinic acids, 3- and 4-pcoumaroylquinic acids, p-coumaric acid, quercetin 3-galactoside, quercetin 3-pentoside derivative, quercetin 3-arabinoside, quercetin 3-xyloside and quercetin 3-rhamnoside. The antimicrobial capacity was screened against Gram positive (Bacillus cereus, B. subtilis, Staphylococcus aureus) and Gram negative bacteria (Pseudomonas aeruginosa, Escherichia coli, Klebsiella...
Tipo: Article Palavras-chave: Walnut leaves; Phenolics; Antimicrobial activity; Antioxidant properties.
Ano: 2007 URL: http://hdl.handle.net/10198/719
Registros recuperados: 6
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