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Registros recuperados: 21
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Antioxidant potential and relation with chemical composition of wild edible mushrooms cap and stipe IPB - Escola Superior Agrária
Ribeiro, Bárbara; Lopes, Rosário; Andrade, P.B.; Seabra, R.M.; Gonçalves, Rui; Baptista, Paula; Valentão, P..
Tipo: ConferenceObject Palavras-chave: Organic acids; Phenolics composition; Alkaloids; Wild mushrooms.
Ano: 2008 URL: http://hdl.handle.net/10198/5736
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Aroma compounds in eleven edible mushroom species: relationship between volatile profile and sensorial characteristics IPB - Escola Superior Agrária
Pinho, P. Guedes de; Ribeiro, Bárbara; Gonçalves, Rui; Baptista, Paula; Valentão, P.; Seabra, R.M.; Andrade, P.B..
Volatile and semi-volatile components of 11 wild edible mushrooms, Suillus bellini, Suillus luteus, Suillus granulatus, Tricholomopsis rutilans, Hygrophorus agathosmus, Amanita rubescens, Russula cyanoxantha, Boletus edulis, Tricholoma equestre, Fistulina hepatica and Cantharellus cibarius, were determined by headspace solidphase microextraction and by liquid extraction combined with gas chromatographymass spectrometry.
Tipo: ConferenceObject Palavras-chave: Volatile and semi-volatile components; Wild edible mushrooms.
Ano: 2008 URL: http://hdl.handle.net/10198/5934
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Aroma compounds in eleven edible mushroom species: relationship between volatile profile and sensorial characteristics IPB - Escola Superior Agrária
Pinho, P. Guedes de; Ribeiro, Bárbara; Gonçalves, Rui; Baptista, Paula; Valentão, P.; Seabra, R.M.; Andrade, P.B..
Tipo: ConferenceObject Palavras-chave: Wild edible mushrooms; Volatile compounds; HS - SPME; GC-MS.
Ano: 2007 URL: http://hdl.handle.net/10198/5756
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Aroma compounds in eleven edible mushroom species: relationship between volatile profile and sensorial characteristics IPB - Escola Superior Agrária
Pinho, P. Guedes de; Ribeiro, Bárbara; Gonçalves, Rui; Baptista, Paula; Valentão, P.; Seabra, R.M.; Andrade, P.B..
Tipo: ConferenceObject Palavras-chave: Wild edible mushrooms; Aroma compounds; GC- MSMS; Sensorial characteristics.
Ano: 2008 URL: http://hdl.handle.net/10198/5735
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Beefsteak fungus Fistulina hepatica: phenolic compounds and organic acids contents and antioxidative properties IPB - Escola Superior Agrária
Ribeiro, Bárbara; Valentão, P.; Baptista, Paula; Seabra, R.M.; Andrade, P.B..
Tipo: ConferenceObject Palavras-chave: Fistulina hepatica; Phenolic compounds; Antioxidant capacity; HPLC - DAD.
Ano: 2006 URL: http://hdl.handle.net/10198/5748
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Comparative study of phytochemicals and antioxidant potential of wild edible mushroom caps and stipes IPB - Escola Superior Agrária
Ribeiro, Bárbara; Lopes, Rosário; Andrade, P.B.; Seabra, R.M.; Gonçalves, Rui; Baptista, Paula; Quelhas, Inês; Valentão, P..
A comparative study of the organic acids and phenolics composition and of the total alkaloids content of entire wild edible mushrooms (Russula cyanoxantha, Amanita rubescens, Suillus granulatus and Boletus edulis) and correspondent caps and stipes was performed. All species presented oxalic, citric, malic and fumaric acids, with A. rubescens exhibiting the highest total organic acids content. Organic acids were preferably fixed in the cap. Among phenolics, only p-hydroxybenzoic acid was found in A. rubescens and S. granulatus, in very low amounts. B. edulis was the species that presented the highest total alkaloid amounts. Except for this species, alkaloids mainly accumulated in the cap. All of the species exhibited a concentration-dependent scavenging...
Tipo: Article Palavras-chave: Wild edible mushrooms; Alkaloids; Phenolic compounds; Organic acids; Antioxidant potential.
Ano: 2008 URL: http://hdl.handle.net/10198/4404
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Comparative study on free amino acids composition of wild edible mushroom species IPB - Escola Superior Agrária
Ribeiro, Bárbara; Andrade, P.B.; Silva, B.M.; Baptista, Paula; Seabra, R.M.; Valentão, P..
A comparative study on the amino acid composition of 11 wild edible mushroom species (Suillus bellini, Suillus luteus, Suillus granulatus, Tricholomopsis rutilans, Hygrophorus agathosmus, Amanita rubescens, Russula cyanoxantha, Boletus edulis, Tricholoma equestre, Fistulina hepatica, and Cantharellus cibarius) was developed. To define the qualitative and quantitative profiles, a derivatization procedure with dabsyl chloride was performed, followed by HPLC-UV-vis analysis. Twenty free amino acids (aspartic acid, glutamic acid, asparagine, glutamine, serine, threonine, glycine, alanine, valine, proline, arginine, isoleucine, leucine, tryptophan, phenylalanine, cysteine, ornithine, lysine, histidine, and tyrosine) were determined. B. edulis and T. equestre...
Tipo: Article Palavras-chave: Wild edible mushrooms; Free amino acids; Nutritional value.
Ano: 2008 URL: http://hdl.handle.net/10198/4407
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Contents of carboxylic acids and two phenolics and antioxidant activity of dried Portuguese wild edible mushrooms IPB - Escola Superior Agrária
Ribeiro, Bárbara; Rangel, Joana; Valentão, P.; Baptista, Paula; Seabra, R.M.; Andrade, P.B..
The organic acids and phenolics compositions of nine wild edible mushrooms species ( Suillus bellini, Tricholomopsis rutilans, Hygrophorus agathosmus, Amanita rubescens, Russula cyanoxantha, Boletus edulis, Tricholoma equestre, Suillus luteus, and Suillus granulatus) were determined by HPLC-UV and HPLC-DAD, respectively. The antioxidant potential of these species was also assessed by using the DPPH¥ scavenging assay. The results showed that all of the species presented a profile composed of at least five organic acids: oxalic, citric, malic, quinic, and fumaric acids. In a general way, the pair of malic plus quinic acids were the major compounds. Only very small amounts of two phenolic compounds were found in some of the analyzed species: p-hydroxybenzoic...
Tipo: Article Palavras-chave: Wild edible mushrooms; Organic acids; Phenolic compounds; Antioxidant potential.
Ano: 2006 URL: http://hdl.handle.net/10198/941
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Correlation between the pattern volatiles and the overall aroma of wild edible mushrooms IPB - Escola Superior Agrária
Pinho, P. Guedes de; Ribeiro, Bárbara; Gonçalves, Rui; Baptista, Paula; Valentão, P.; Seabra, R.M.; Andrade, P.B..
Volatile and semivolatile components of 11 wild edible mushrooms, Suillus bellini, Suillus luteus, Suillus granulatus, Tricholomopsis rutilans, Hygrophorus agathosmus, Amanita rubescens, Russula cyanoxantha, Boletus edulis, Tricholoma equestre, Fistulina hepatica, and Cantharellus cibarius, were determined by headspace solid-phase microextraction (HS-SPME) and by liquid extraction combined with gas chromatography–mass spectrometry (GC-MS). Fifty volatiles and nonvolatiles components were formally identified and 13 others were tentatively identified. Using sensorial analysis, the descriptors “mushroomlike”, “farm-feed”, “floral”, “honeylike”, “hay-herb”, and “nutty” were obtained. A correlation between sensory descriptors and volatiles was observed by...
Tipo: Article Palavras-chave: Wild edible mushrooms; Semivolatile compounds; Sensorial analysis; Volatile; GC-MS; Solid-phase microextraction.
Ano: 2008 URL: http://hdl.handle.net/10198/4405
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Efeito do processamento na composição em ácidos orgânicos em castanhas das cultivares Judia e Longal. IPB - Escola Superior Agrária
Pereira, J.A.; Ribeiro, Bárbara; Rangel, Joana; Valentão, P.; Andrade, P.B.; Bento, Albino; Seabra, R.M..
Com o presente trabalho pretendeu-se, por um lado, proceder à quantificação dos ácidos orgânicos das cultivares de castanha, Judia e Longal, e por outro verificar o efeito das formas mais comuns de processamento (castanhas assadas, cozidas e fritas) na variação destes ácidos, por HPLC/UV. Os resultados mostraram que em ambas as cultivares foram identificados sete ácidos orgânicos, nomeadamente: ácido oxálico, ácido cis-aconitico, ácido cítrico, ácido ascórbico, ácido málico, ácido quinico e ácido fumárico. O maior teor em ácidos orgânicos foi observado em frutos não processados da Cv. Longal, com 251,2±80,7 mg/kg de matéria seca. O ácido ascórbico foi o ácido orgânico mais abundante. Todos os processos de processamento levaram a uma redução superior a 46%...
Tipo: Article Palavras-chave: Castanha; Processamento; Composição; Ácidos orgânicos.
Ano: 2007 URL: http://hdl.handle.net/10198/5348
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Efeito do processamento na composição em ácidos orgânicos em castanhas das cultivares Judia e Longal. IPB - Escola Superior Agrária
Pereira, J.A.; Ribeiro, Bárbara; Rangel, Joana; Valentão, P.; Andrade, P.B.; Bento, Albino; Seabra, R.M..
Com o presente trabalho pretendeu-se, por um lado, proceder à quantificação dos ácidos orgânicos das cultivares de castanha, Judia e Longal, e por outro verificar o efeito das formas mais comuns de processamento (castanhas assadas, cozidas e fritas) na variação destes ácidos, por HPLC/UV.
Tipo: ConferenceObject
Ano: 2007 URL: http://hdl.handle.net/10198/5346
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Effect of the conservation procedure on the contents of phenolic compounds and organic acids in Chanterelle (Cantharellus cibarius) Mushroom IPB - Escola Superior Agrária
Valentão, P.; Andrade, P.B.; Rangel, Joana; Ribeiro, Bárbara; Silva, B.M.; Baptista, Paula; Seabra, R.M..
To check the influence of the conservation procedure in the chemical composition of chanterelle mushroom, phenolic compounds and organic acids of samples preserved under four different conditions (drying, freezing, conservation in olive oil and in vinegar) were determined. Phenolics and organic acids were analyzed by HPLC-DAD and HPLC-UV, respectively. The results showed that chanterelle is characterized by the presence of six phenolic compounds (3-, 4-, and 5-O-caffeoylquinic acid, caffeic acid, p-coumaric acid, and rutin) and five organic acids (citric, ascorbic, malic, shikimic, and fumaric acids). Samples preserved in olive oil also exhibited hydroxytyrosol, tyrosol, luteolin, and apigenin, whereas conservation in vinegar led to the detection of...
Tipo: Article Palavras-chave: Chanterelle; Cantharellus cibarius; Conservation; Phenolic compounds; Organic acids.
Ano: 2005 URL: http://hdl.handle.net/10198/940
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Fatty acid composition of wild edible mushrooms species: a comparative study IPB - Escola Superior Agrária
Ribeiro, Bárbara; Pinho, P. Guedes de; Andrade, P.B.; Baptista, Paula; Valentão, P..
A comparative study was developed on the total fatty acids composition of twelve wild edible mushroom species (Suillus bellini, Suillus luteus, Suillus granulatus, Hygrophorus agathosmus, Amanita rubescens, Russula cyanoxantha, Boletus edulis, Tricholoma equestre, Fistulina hepatica, Cantharellus cibarius, Amanita caesarea and Hydnum rufescens). In order to define qualitative and quantitative profiles, combined fatty acids were hydrolyzed with potassium hydroxide/methanol and all free compounds were derived to their methyl ester forms with methanolic boron trifluoride, followed by analysis by GC-MS. Thirty fatty acids were determined. As far as we know, the fatty acid profiles of A. caesarea and H. rufescens are described for the first time. As for the...
Tipo: Article Palavras-chave: Wild edible mushrooms; Fatty acids; Comparative analysis.
Ano: 2009 URL: http://hdl.handle.net/10198/4409
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Influence of different fertilization regimes on the amounts of organic acids of Brassica oleracea L. var. costata DC. IPB - Escola Superior Agrária
Ribeiro, Bárbara; Sousa, C.; Lopes, G.; Pereira, D.M.; Taveira, M.; Dopico-García, S.; Pereira, J.A.; Bento, Albino; Rodrigues, M.A.; Valentão, P.; Seabra, R.M.; Andrade, P.B..
Tipo: ConferenceObject
Ano: 2007 URL: http://hdl.handle.net/10198/5559
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Leucopaxillus giganteus mycelium: effect of nitrogen source on organic acids and alkaloids IPB - Escola Superior Agrária
Pereira, D.M.; Ribeiro, Bárbara; Andrade, P.B.; Baptista, Paula; Barros, Lillian; Ferreira, Isabel C.F.R.; Seabra, R.M.; Valentão, P..
ln order to study the influence 01 lour inorganic nitrogen sources (NH4N03, NaN02, KN03 and (NH4)2HP04) on the chemical composition 01 Leucopaxillus giganteus mushroom mycelium, its organic acids profile was determined by HPLC-UV and total alkaloids content was assessed by a spectrophotometric method, alter precipitation by Dragendorlf's reagent. lhe results showed that L. giganteus presented an organic acids profile composed by oxalicis-aconitic, citric and lumaric acids, being citric acid the major one.
Tipo: ConferenceObject
Ano: 2008 URL: http://hdl.handle.net/10198/3689
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Leucopaxillus giganteus mycelium: effect of nitrogen source on organic acids and alkaloids IPB - Escola Superior Agrária
Ribeiro, Bárbara; Andrade, P.B.; Baptista, Paula; Barros, Lillian; Ferreira, Isabel C.F.R.; Seabra, R.M.; Valentão, P..
The aim of this work was to find the most useful inorganic nitrogen source to enable Leucopaxillus giganteus to become a more nutritious mushroom, regarding organic acid and phenolic composition and total alkaloids content. For these, the influence of NH4NO3,NaNO2, KNO3,, and (NH4)2HPO4 on the organic acid production was determined by HPLC-UV and total alkaloid content was assessed by a spectrophotometric method, after precipitation by Dragendorff’s reagent. The results showed that L. giganteus presented an organic acid profile composed of oxalic, cis-aconitic, citric, and fumaric acids, citric acid being the major one. The quantitative organic acid profile and total alkaloid content were affected by the nitrogen source and depended on the developmental...
Tipo: Article Palavras-chave: Leucopaxillus giganteus; Inorganic nitrogen sources; Organic acids; Alkaloids.
Ano: 2008 URL: http://hdl.handle.net/10198/2715
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Metabolite profiling of wild edible mushrooms species IPB - Escola Superior Agrária
Valentão, P.; Ribeiro, Bárbara; Pinho, P. Guedes de; Baptista, Paula; Andrade, P.B..
Mushrooms are of increasing importance in modern nutrition and medicine. Trás-os-Montes region (north-eastern Portugal) is known for the variety of its soils and diversity of climate conditions. This variability assumes an important role in mushroom production, explaining why this region is recognized as one of the richest ones in wild edible species. A metabolomics approach was applied to twelve wild edible mushroom species (Suillus bellini, Suillus luteus, Suillus granulatus, Hygrophorus agathosmus, Amanita rubescens, Russula cyanoxantha, Boletus edulis, Tricholoma equestre, Fistulina hepatica, Cantharellus cibarius, Amanita caesarea and Hydnum rufescens) collected in this area, with the purposes of improving the knowledge about their chemical profiles...
Tipo: ConferenceObject Palavras-chave: Wild edible mushrooms; Metabolomics.
Ano: 2010 URL: http://hdl.handle.net/10198/4494
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Organic acids in two Portuguese chestnut (Castanea sativa Miller) varieties. IPB - Escola Superior Agrária
Ribeiro, Bárbara; Rangel, Joana; Valentão, P.; Andrade, P.B.; Pereira, J.A.; Bölke, H.; Seabra, R.M..
The organic acids composition of two different chestnut (Castanea sativa Miller) varieties (Judia and Longal) were determined by HPLC/UV. In order to check the influence of the processing over these compounds, samples treated in three distinct manners (roasted, boiled and fried) were also analysed. The results showed that chestnut is characterized by the presence of seven organic acids: oxalic, cisaconitic, citric, ascorbic, malic, quinic and fumaric acids. The organic acid quantitative profile allows the distinction of the two varieties. Longal variety samples presented higher organic acids contents than those from Judia variety. The contents of the pair malic plus quinic acids may be useful for the discrimination of the two varieties. Roasting, boiling...
Tipo: Article Palavras-chave: Chestnut; Castanea sativa; Judia; Longal; Processing; Organic acids.
Ano: 2007 URL: http://hdl.handle.net/10198/735
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Phenolic compounds, organic acids profiles and antioxidative of beefsteak fungus (Fistulina hepatica) IPB - Escola Superior Agrária
Ribeiro, Bárbara; Valentão, P.; Baptista, Paula; Seabra, R.M.; Andrade, P.B..
The phenolic compounds and the organic acids composition of the edible beefsteak fungus Fistulina hepatica was determined by HPLC/DAD and HPLC/UV, respectively. The results showed a profile composed by five phenolic compounds (caffeic, p-coumaric and ellagic acids, hyperoside and quercetin) and six organic acids (oxalic, aconitic, citric, malic, ascorbic and fumaric acids). The quantification of the identified compounds revealed that ellagic acid (ca. 49.7%) and malic acid (ca. 57.9%) are the main compounds in this species. In a general way the phenolic profile revealed to be more constant than the organic acids one and could be more useful for the quality control of the species. Beefsteak fungus was also investigated for its capacity to act as a scavenger...
Tipo: Article Palavras-chave: Fistulina hepatica; Beefsteak fungus; Phenolic compounds; Organic acids; Antioxidant potential.
Ano: 2007 URL: http://hdl.handle.net/10198/943
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Phenolic profile and antioxidative properties of the beefsteak fungus Fistulina hepatica IPB - Escola Superior Agrária
Silva, B.M.; Ribeiro, Bárbara; Rangel, Joana; Baptista, Paula; Seabra, R.M..
The phenolic composition of the edible beefsteak fungus Fistulina hepatica was determined by HPLC/DAD. The results showed a profile composed by caffeic, p-coumaric and ellagic acids, hyperoside and quercetin. Ellagic acid was the main compound in this species. Beefsteak fungus was also investigated for its capacity to act as a scavenger of DPPH radical and reactive oxygen species (superoxide radical, hydroxyl radical and hypochlorous acid). Good results were obtained against DPPH and superoxide radicals and hypochlorous acid but a prooxidant effect was observed for hydroxyl radical.
Tipo: ConferenceObject Palavras-chave: Fistulina hepatica; Phenolic composition; Antioxidative properties.
Ano: 2006 URL: http://hdl.handle.net/10198/5721
Registros recuperados: 21
Primeira ... 12 ... Última
 

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