Tronchuda cabbage (Brassica oleracea L. var. costata DC) seeds: phytochemical c...

• Author(s): Ferreres, F. ; Sousa, C. ; Valentão, P. ; Seabra, R.M. ; Pereira, J.A. ; Andrade, P.B.
• Date: 2007
• Persistent ID: http://hdl.handle.net/10198/752
• Origin: Biblioteca Digital do IPB
• Subject(s): Tronchuda cabbage seeds; Brassica oleracea L. var. costata DC; Phenolic compounds; Organic acids; Antioxidant capacity
• Document Type: Article
• Language: English

Description

Tronchuda cabbage (Brassica oleracea L. var. costata DC) seeds were studied for their chemical composition and antioxidant capacity. Thirteen phenolic compounds were characterized and quantified by reversed-phase HPLC-DAD-MS/MS-ESI and HPLC-DAD, respectively: two sinapoylgentiobiose isomers, three sinapoylglucose isomers, kaempferol-3-(sinapoyl)sophorotrioside-7-glucoside, sinapoylcholine, kaempferol-3,7-diglucoside-40-(sinapoyl)glucoside, three disinapoylgentiobiose isomers, 1,2,20-trisinapoylgentiobiose and 1,2-disinapoylglucose. Seven organic acids (aconitic, citric, ascorbic, malic, quinic, shikimic and fumaric acids) were also identified and quantified by HPLC-UV. The aqueous extract of tronchuda cabbage seeds was investigated for its capacity to act as a scavenger of DPPH- radical and reactive oxygen species (superoxide radical, hydroxyl radical and hypochlorous acid), exhibiting antioxidant capacity in a concentration-dependent manner against all radicals. These results may be attributed to the high content of hydroxycinnamic derivatives and ascorbic acid.