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Multivariate analysis of of Tronchuda Cabbage (Brassica oleracea L. var. costat...
Sousa, C.; Pereira, D.M.; Pereira, J.A.; Rodrigues, M.A.; Bento, Albino; Dopico-García, S.; Lopes, Graciliana; Valentão, P.; Seabra, R.M.; Andrade, P.B.A field experiment was carried out to investigate the effect of fertilization level on the phenolic composition of tronchuda cabbage (Brassica oleracea L. var. costata DC) external and internal leaves. Eight different plots were constituted: a control without fertilization, one with organic matter, and six experiments with conventional fertilizers (nitrogen, boron, and sulfur, two levels each). The phenolic com...
Screening of antioxidant compounds during sprouting of Brassica oleracea L. var...
Sousa, C.; Lopes, Graciliana; Pereira, D.M.; Taveira, M.; Valentão, P.; Seabra, R.M.; Pereira, J.A.; Baptista, Paula; Ferreres, F.; Andrade, P.B.The changes in antioxidant compounds of Brassica oleracea L. var. costata DC seeds were monitored during the first twelve days of seedling development. Sprouts were screened at time intervals of two days for phenolic compounds and organic acids. The identified phenolic compounds included esters of sinapic acid with glucose, gentiobiose and kaempferol, as well as sinapoylcholine. The organic acids were oxalic, a...
Phenolic compounds in Brassica oleracea L. var. costata DC: effect of fertiliza...
Dopico-García, S.; Sousa, C.; Lopes, Graciliana; Pereira, D.M.; Pereira, J.A.; Bento, Albino; Rodrigues, M.A.; Valentão, P.; Seabra, R.M.; Andrade, P.B.
Influence of different fertilization regimes on the amounts of organic acids of...
Ribeiro, Bárbara; Sousa, C.; Lopes, Graciliana; Pereira, D.M.; Taveira, M.; Dopico-García, S.; Pereira, J.A.; Bento, Albino; Rodrigues, M.A.
Rumex induratus leaves: phenolic compounds and antioxidant capacity
Valentão, P.; Ribeiro, Vitor; Lopes, Graciliana; Rodrigues, M.A.; Izquierdo, Angel; Ferreres, F.; Seabra, R.M.The phenolic composition of Rumex induratus was determined by HPLC-DAD-MS/MS-ESI and HPLC/DAD. The results showed a profile composed by caffeoyl-hexoside. two p-coumaroyl-hexoside isomers, feruloyl-hexoside, sinapoyl-hexoside. 6-C-hexosyl-quercetin. 8-C-hexosyl-luteolin, 6-C-hexosyl- luteolin, 6.C-hexosyl-apigenin. 3-O- hexosyl-quercetin, 3-O-rutinosyl-quercetin. 7.O.hexosyI-diosnietin, 3.O-rutinosyl-isorhamnet...
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...
Quantitation of nine organic acids in wild mushrooms
Valentão, P.; Lopes, Graciliana; Valente, Miguel; Barbosa, Paula; Andrade, P.B.; Silva, B.M.; Baptista, Paula; Seabra, R.M.The organic acids composition of six wild edible mushroom species ( Amanita caesarea, Boletus edulis, Gyroporus castaneus, Lactarius deliciosus, Suillus collinitus, and Xerocomus chrysenteron) was determined by an HPLC-UV detector method. The results showed that all of the samples presented a profile composed of at least five organic acids: citric, ketoglutaric, malic, succinic, and fumaric acids. Several sampl...
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