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Registros recuperados: 4
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Chemical and antioxidative assessment of dietary turnip (Brassica rapa var. rapa) IPB - Escola Superior Agrária
Fernandes, F.; Valentão, P.; Sousa, C.; Pereira, J.A.; Seabra, R.M.; Andrade, P.B..
The phenolic compounds and organic acids of turnip (Brassica rapa var. rapa L.) edible parts (leaves and stems, flower buds and roots) were determined by HPLC–DAD and HPLC–UV, respectively. The results revealed a profile composed of 14 phenolics (3-p-coumaroylquinic, caffeic, ferulic and sinapic acids, kaempferol 3-O-sophoroside-7-O-glucoside, kaempferol 3-O-sophoroside-7-O-sophoroside, kaempferol 3-O-(feruloyl/caffeoyl)-sophoroside-7-O-glucoside, kaempferol 3,7-O-diglucoside, isorhamnetin 3,7-O-diglucoside, kaempferol 3-O-sophoroside, 1,2-disinapoylgentiobiose, 1,20-disinapoyl-2-feruloylgentiobiose, kaempferol 3-O-glucoside and isorhamnetin 3-O-glucoside) and six organic acids (aconitic, citric, ketoglutaric, malic, shikimic and fumaric acids). The...
Tipo: Article Palavras-chave: Turnip; Brassica rapa var. rapa L.; Phenolic compounds; Organic acids; Antioxidant activity.
Ano: 2007 URL: http://hdl.handle.net/10198/736
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Evolution of Brassica rapa L. var. rapa volatile composition by HS-SPME and GC/IT-MS. IPB - Escola Superior Agrária
Taveira, M.; Fernandes, F.; Pinho, P. Guedes de; Andrade, P.B.; Pereira, J.A.; Valentão, P..
Brassica rapa var. rapa L. (turnip) is highly appreciated and consumed by human. In this work, the volatile profile of B. rapa var. rapa was studied during the maturation process. The volatiles of seeds, sprouts with 6 and 9 days, and adult plant were determined using headspace solid-phase microextraction (HS-SPME) combined with gas chromatography/ion trap-mass spectrometry (GC/IT-MS). Several constituents, including alcohols, aldehydes, esters, ketones, norisoprenoids, nitrogen and sulphur compounds were characterized, totalizing 64 compounds. Isothiocyanates are the main volatiles in all matrices, being 3-butenyl isothiocyanate the major compound. Qualitative and quantitative differences were found among the analysed materials. Nitrogen and sulphur...
Tipo: Article Palavras-chave: Brassica rapa var. rapa L.; Turnip; Sprouts; Seeds; Volatile compounds.
Ano: 2009 URL: http://hdl.handle.net/10198/3110
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HPLC-DAD-MS/MS-ESI screening of phenolic compounds in Pieris brassicae L. reared on Brassica rapa var. rapa L.. IPB - Escola Superior Agrária
Ferreres, F.; Valentão, P.; Pereira, J.A.; Bento, Albino; Noites, A.; Seabra, R.M.; Andrade, P.B..
The phenolic profiles of cabbage white butterfly (Pieris brassicae L.; Lepidoptera: Pieridae) at different development stages (larvae, exuviae, and butterfly), its excrements, and its host plant Brassica rapa var. rapa L. were determined by high performance liquid chromatography- diode-array detector-mass spectrometry/mass spectrometry-electrospray ionization (HPLC-DAD-MS/MS-ESI). Twenty-five acylated and nonacylated flavonoid glycosides and ferulic and sinapic acids were identified in host plant, from which only 12 compounds were found in the excrements. In addition, the excrements showed the presence of sulfate flavonoids and other flavonoid glycosides that were not detected in the leaves. In the larvae kept without food for 12 h, only 3 compounds common...
Tipo: Article Palavras-chave: Pieris brassicae L; Brassica rapa var. rapa L.; Turnip; Phenolic compounds; HPLC-DAD/MS/MS/ESI.
Ano: 2008 URL: http://hdl.handle.net/10198/775
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Inflorescences of Brassicacea species as source of bioactive compounds: a comparative study IPB - Escola Superior Agrária
Sousa, C.; Taveira, M.; Valentão, P.; Fernandes, F.; Pereira, J.A.; Estevinho, Leticia M.; Bento, Albino; Ferreres, F.; Seabra, R.M.; Andrade, P.B..
Two Brassica oleracea varieties (B. oleracea L. var. costata DC and B. oleracea L. var. acephala) and Brassica rapa L. var. rapa inflorescences were studied for their chemical composition and antioxidant capacity. Phenolic compounds and organic acids profiles were determined by HPLC–DAD and HPLC–UV, respectively. B. oleracea var. costata and B. oleracea L. var. acephala inflorescences presented a similar qualitative phenolic composition, exhibiting several complex kaempferol derivatives and 3-p-coumaroylquinic acid, while B. rapa var. rapa was characterized by kaempferol and isorhamnetin glycosides and several phenolic acids derivatives. B. oleracea L. var. costata and B. rapa var. rapa showed the highest phenolics content. The three Brassica exhibited the...
Tipo: Article Palavras-chave: Brassica oleracea L. var. costata DC; Brassica oleracea L. var. acephala; Brassica rapa var. rapa L.; Inflorescences; Phenolic compounds; Organic acids; Antioxidant activity; Antimicrobial activity.
Ano: 2008 URL: http://hdl.handle.net/10198/757
Registros recuperados: 4
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