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Organic acids in two Portuguese chestnut (Castanea sativa Miller) varieties.
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, cit...
Efeito do processamento na composição em ácidos orgânicos em castanhas das cult...
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, á...
Efeito do processamento na composição em ácidos orgânicos em castanhas das cult...
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.
Contents of carboxylic acids and two phenolics and antioxidant activity of drie...
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 ...
Phenolic profile and antioxidative properties of the beefsteak fungus Fistulina...
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 r...
Influence of two fertilization regimes on the amounts of organic acids and phen...
Sousa, C.; Valentão, P.; Rangel, Joana; Lopes, Graciliana; Pereira, J.A.; Ferreres, F.; Seabra, R.M.; Andrade, P.B.A phytochemical study was undertaken on tronchuda cabbage ( Brassica oleracea L. var. costata DC) cultivated under conventional and organic practices and collected at different times. Six organic acids (aconitic, citric, ascorbic, malic, shikimic, and fumaric acids) were identified and quantified by HPLC-UV. Qualitative and quantitative differences were noted between internal and external leaves. Analysis of th...
Effect of the conservation procedure on the contents of phenolic compounds and ...
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...
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