Percorrer por autor "Pinheiro, Cristina"
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- Analysis of phenolic compounds from hazelnut (Corylus avellana L.) leavesPublication . Amaral, Joana S.; Ferreres, Frederico; Santos, Alberto; Pinheiro, Cristina; Andrade, Paula B.; Seabra, Rosa M.Hazelnut leaf has been used in folk medicine in varicose veins and haemorrhoidal symptomatology for its vasoconstrictor and antihaemorrhagic properties. Slight antidysenteric, antifungal and healing properties have also been described
- Phenolic compounds in external leaves of tronchuda cabbage (Brassica oleracea L. var. costata DC)Publication . Ferreres, Frederico; Valentão, Patrícia; Llorach, Rafael; Pinheiro, Cristina; Cardoso, Lígia; Pereira, J.A.; Seabra, Rosa M.; Andrade, Paula B.Glycosylated kaempferol derivatives from the external leaves of tronchuda cabbage ( Brassica oleracea L. var. costataDC) characterized by reversed-phase HPLC-DAD-MS/MS-ESI were kaempferol 3- Osophorotrioside- 7-O-glucoside, kaempferol 3-O- (methoxycaffeoyl/caffeoyl)sophoroside-7- O-glucoside, kaempferol 3-O-sophoroside-7-O-glucoside, kaempferol 3-O-sophorotrioside-7-O-sophoroside, kaempferol 3- O-sophoroside-7- O-sophoroside, kaempferol 3- O-tetraglucoside-7- O-sophoroside, kaempferol 3- O-(sinapoyl/caffeoyl)sophoroside-7-O-glucoside, kaempferol 3-O-(feruloyl/caffeoyl)sophoroside-7- O-glucoside, kaempferol 3-O-sophorotrioside, kaempferol 3-O-(sinapoyl)sophoroside, kaempferol 3-O- (feruloyl)sophorotrioside, kaempferol 3- O-(feruloyl)sophoroside, kaempferol 3- O-sophoroside, and kaempferol 3- O-glucoside. These acylated derivatives are reported for the first time in nature, with the exception of kaempferol 3- O-(sinapoyl)sophoroside. Quantification of the identified compounds was achieved by HPLC-DAD and carried out in samples cultivated under conventional or organic practices and collected at different times. In general, samples from organic production exhibited higher total phenolics content than those from conventional practices collected in the same period.
- Phenolic profile of hazelnut (Corylus avellana L.) leaves cultivars grown in PortugalPublication . Amaral, Joana S.; Ferreres, Frederico; Andrade, Paula B.; Valentão, Patrícia; Pinheiro, Cristina; Santos, Alberto; Seabra, Rosa M.In this study, phenolic compounds of hazelnut leaves of 10 different cultivars with the same cultural, geographical, geological and climatic conditions were analyzed by HPLC/DAD and HPLC/DAD/MS/MS – ESI. Eight phenolic compounds (3-caffeoylquinic acid, 5-caffeoylquinic acid, caffeoyltartaric acid, p-coumaroyltartaric acid, myricetin 3-rhamnoside, quercetin 3-glycoside, quercetin 3-rhamnoside and kaempferol 3-rhamnoside) were identified and quantified. All of the analyzed samples showed a similar phenolic profile, in which myricetin 3-rhamnoside and quercetin 3-rhamnoside were the major compounds and caffeoyltartaric and p-coumaroyltartaric acids were present in vestigial amounts.