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Francisco A Tomasbarberan - One of the best experts on this subject based on the ideXlab platform.
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identification of the flavonoid fraction in saffron spice by lc dad ms ms comparative study of samples from different geographical origins
Food Chemistry, 2007Co-Authors: Manuel Carmona, Federico Ferreres, Ana M Sanchez, Amaya Zalacain, Francisco A Tomasbarberan, Gonzalo L AlonsoAbstract:Abstract The flavonoid fraction in saffron spice has been analysed, for the first time, by LC-DAD-MS/MS ESI and five Kaempferol derivatives have been found. Compounds such as Kaempferol-3-sophoroside, Kaempferol-3-sophoroside-7-glucoside and Kaempferol-3,7,4′-triglucoside were tentatively identified, whereas other compounds, such as Kaempferol tetrahexoside and Kaempferol-3-dihexoside were detected. Saffron samples from different geographical origins were clearly separated by their Kaempferol 3-sophoroside contents that were able to explain 100% of the variance when a discriminant test was carried out.
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hplc dad ms ms esi characterization of unusual highly glycosylated acylated flavonoids from cauliflower brassica oleracea l var botrytis agroindustrial byproducts
Journal of Agricultural and Food Chemistry, 2003Co-Authors: Rafael Llorach, Federico Ferreres, Angel Gilizquierdo, Francisco A TomasbarberanAbstract:In a recent program to investigate the possible use of vegetable handling and commercialization wastes and residues as a source of potentially bioactive extracts, we have studied cauliflower byproducts. A total of twenty-eight compounds were characterized by HPLC-DAD-MS, of these, twenty-two are produced naturally by the plant. The main compounds found were Kaempferol 3-diglucoside-7-glucoside and its combinations with different hydroxycinnamic acids. Moreover, some flavonoids with an unusual high grade of glycosylation have been isolated and tentatively identified for the first time. To our knowledge, the characterization of flavonoids with more than four sugars has not been previously reported. The new products isolated were tentatively identified as Kaempferol 3-diglucoside-7-diglucoside, Kaempferol 3-triglucoside-7-diglucoside, Kaempferol 3-feruloyldiglucoside-7-diglucoside, Kaempferol 3-sinapoyltriglucoside-7-glucoside, Kaempferol 3-disinapoyltriglucoside-7-glucoside, Kaempferol 3-sinapoyltriglucoside-7-diglucoside and Kaempferol 3-disinapoyltriglucoside-7-diglucoside.
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hplc dad ms ms esi characterization of unusual highly glycosylated acylated flavonoids from cauliflower brassica oleracea l var botrytis agroindustrial byproducts
Journal of Agricultural and Food Chemistry, 2003Co-Authors: Rafael Llorach, Federico Ferreres, Angel Gilizquierdo, Francisco A TomasbarberanAbstract:In a recent program to investigate the possible use of vegetable handling and commercialization wastes and residues as a source of potentially bioactive extracts, we have studied cauliflower byproducts. A total of twenty-eight compounds were characterized by HPLC-DAD-MS, of these, twenty-two are produced naturally by the plant. The main compounds found were Kaempferol 3-diglucoside-7-glucoside and its combinations with different hydroxycinnamic acids. Moreover, some flavonoids with an unusual high grade of glycosylation have been isolated and tentatively identified for the first time. To our knowledge, the characterization of flavonoids with more than four sugars has not been previously reported. The new products isolated were tentatively identified as Kaempferol 3-diglucoside-7-diglucoside, Kaempferol 3-triglucoside-7-diglucoside, Kaempferol 3-feruloyldiglucoside-7-diglucoside, Kaempferol 3-sinapoyltriglucoside-7-glucoside, Kaempferol 3-disinapoyltriglucoside-7-glucoside, Kaempferol 3-sinapoyltriglucosid...
Rafael Llorach - One of the best experts on this subject based on the ideXlab platform.
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phenolic compounds in external leaves of tronchuda cabbage brassica oleracea l var costata dc
Journal of Agricultural and Food Chemistry, 2005Co-Authors: Federico Ferreres, Patricia Valentao, Rafael Llorach, Cristina Pinheiro, Ligia Cardoso, Jose Alberto Pereira, Carla Sousa, Rosa M Seabra, Paula B AndradeAbstract:Glycosylated Kaempferol derivatives from the external leaves of tronchuda cabbage (Brassica oleracea L. var. costata DC) characterized by reversed-phase HPLC-DAD-MS/MS-ESI were Kaempferol 3-O-sophorotrioside-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.
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hplc dad ms ms esi characterization of unusual highly glycosylated acylated flavonoids from cauliflower brassica oleracea l var botrytis agroindustrial byproducts
Journal of Agricultural and Food Chemistry, 2003Co-Authors: Rafael Llorach, Federico Ferreres, Angel Gilizquierdo, Francisco A TomasbarberanAbstract:In a recent program to investigate the possible use of vegetable handling and commercialization wastes and residues as a source of potentially bioactive extracts, we have studied cauliflower byproducts. A total of twenty-eight compounds were characterized by HPLC-DAD-MS, of these, twenty-two are produced naturally by the plant. The main compounds found were Kaempferol 3-diglucoside-7-glucoside and its combinations with different hydroxycinnamic acids. Moreover, some flavonoids with an unusual high grade of glycosylation have been isolated and tentatively identified for the first time. To our knowledge, the characterization of flavonoids with more than four sugars has not been previously reported. The new products isolated were tentatively identified as Kaempferol 3-diglucoside-7-diglucoside, Kaempferol 3-triglucoside-7-diglucoside, Kaempferol 3-feruloyldiglucoside-7-diglucoside, Kaempferol 3-sinapoyltriglucoside-7-glucoside, Kaempferol 3-disinapoyltriglucoside-7-glucoside, Kaempferol 3-sinapoyltriglucoside-7-diglucoside and Kaempferol 3-disinapoyltriglucoside-7-diglucoside.
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hplc dad ms ms esi characterization of unusual highly glycosylated acylated flavonoids from cauliflower brassica oleracea l var botrytis agroindustrial byproducts
Journal of Agricultural and Food Chemistry, 2003Co-Authors: Rafael Llorach, Federico Ferreres, Angel Gilizquierdo, Francisco A TomasbarberanAbstract:In a recent program to investigate the possible use of vegetable handling and commercialization wastes and residues as a source of potentially bioactive extracts, we have studied cauliflower byproducts. A total of twenty-eight compounds were characterized by HPLC-DAD-MS, of these, twenty-two are produced naturally by the plant. The main compounds found were Kaempferol 3-diglucoside-7-glucoside and its combinations with different hydroxycinnamic acids. Moreover, some flavonoids with an unusual high grade of glycosylation have been isolated and tentatively identified for the first time. To our knowledge, the characterization of flavonoids with more than four sugars has not been previously reported. The new products isolated were tentatively identified as Kaempferol 3-diglucoside-7-diglucoside, Kaempferol 3-triglucoside-7-diglucoside, Kaempferol 3-feruloyldiglucoside-7-diglucoside, Kaempferol 3-sinapoyltriglucoside-7-glucoside, Kaempferol 3-disinapoyltriglucoside-7-glucoside, Kaempferol 3-sinapoyltriglucosid...
Rudolf Hermann - One of the best experts on this subject based on the ideXlab platform.
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flavonol glycosides of warburgia ugandensis leaves
Phytochemistry, 2003Co-Authors: Lawrence Onyango Arot Manguro, Peter Lemmen, Rudolf HermannAbstract:Abstract Four new flavonol glycosides: kaempferide 3- O -β-xylosyl (1→2)-β-glucoside, Kaempferol 3- O -α-rhamnoside-7,4′-di- O -β-galactoside, Kaempferol 3,7,4′-tri- O -β-glucoside and quercetin 3- O -[α-rhamnosyl (1→6)] [β-glucosyl (1→2)]-β-glucoside-7- O -α-rhamnoside, were characterized from a methanolic leaf extract of Warburgia ugandensis . The known flavonols: Kaempferol, Kaempferol 3-rhamnoside, Kaempferol 3-rutinoside, myricetin, quercetin 3-rhamnoside, Kaempferol 3-arabinoside, quercetin 3-glucoside, quercetin, Kaempferol 3-rhamnoside-4′-galactoside, myricetin 3-galactoside and Kaempferol 3-glucoside were also isolated. Structures were established by spectroscopic and chemical methods and by comparison with authentic samples.
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flavonol glycosides of warburgia ugandensis leaves
Phytochemistry, 2003Co-Authors: Lawrence Onyango Arot Manguro, Peter Lemmen, Ivar Ugi, Rudolf HermannAbstract:Four new flavonol gycosides: kaempferide 3-O-beta-xylosyl (1-->2)-beta-glucoside, Kaempferol 3-O-alpha-rhamnoside-7,4'-di-O-beta-galactoside, Kaempferol 3,7,4'-tri-O-beta-glucoside and quercetin 3-O-[alpha-rhamnosyl (1-->6)] [beta-glucosyl (1-->2)]-beta-glucoside-7-O-alpha-rhamnoside, were characterized from a methanolic leaf extract of Warburgia ugandensis. The known flavonols: Kaempferol, Kaempferol 3-rhamnoside, Kaempferol 3-rutinoside, myricetin, quercetin 3-rhamnoside, Kaempferol 3-arabinoside, quercetin 3-glucoside, quercetin, Kaempferol 3-rhamnoside-4'-galactoside, myricetin 3-galactoside and Kaempferol 3-glucoside were also isolated. Structures were established by spectroscopic and chemical methods and by comparison with authentic samples.
Federico Ferreres - One of the best experts on this subject based on the ideXlab platform.
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identification of the flavonoid fraction in saffron spice by lc dad ms ms comparative study of samples from different geographical origins
Food Chemistry, 2007Co-Authors: Manuel Carmona, Federico Ferreres, Ana M Sanchez, Amaya Zalacain, Francisco A Tomasbarberan, Gonzalo L AlonsoAbstract:Abstract The flavonoid fraction in saffron spice has been analysed, for the first time, by LC-DAD-MS/MS ESI and five Kaempferol derivatives have been found. Compounds such as Kaempferol-3-sophoroside, Kaempferol-3-sophoroside-7-glucoside and Kaempferol-3,7,4′-triglucoside were tentatively identified, whereas other compounds, such as Kaempferol tetrahexoside and Kaempferol-3-dihexoside were detected. Saffron samples from different geographical origins were clearly separated by their Kaempferol 3-sophoroside contents that were able to explain 100% of the variance when a discriminant test was carried out.
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phenolic compounds in external leaves of tronchuda cabbage brassica oleracea l var costata dc
Journal of Agricultural and Food Chemistry, 2005Co-Authors: Federico Ferreres, Patricia Valentao, Rafael Llorach, Cristina Pinheiro, Ligia Cardoso, Jose Alberto Pereira, Carla Sousa, Rosa M Seabra, Paula B AndradeAbstract:Glycosylated Kaempferol derivatives from the external leaves of tronchuda cabbage (Brassica oleracea L. var. costata DC) characterized by reversed-phase HPLC-DAD-MS/MS-ESI were Kaempferol 3-O-sophorotrioside-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.
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hplc dad ms ms esi characterization of unusual highly glycosylated acylated flavonoids from cauliflower brassica oleracea l var botrytis agroindustrial byproducts
Journal of Agricultural and Food Chemistry, 2003Co-Authors: Rafael Llorach, Federico Ferreres, Angel Gilizquierdo, Francisco A TomasbarberanAbstract:In a recent program to investigate the possible use of vegetable handling and commercialization wastes and residues as a source of potentially bioactive extracts, we have studied cauliflower byproducts. A total of twenty-eight compounds were characterized by HPLC-DAD-MS, of these, twenty-two are produced naturally by the plant. The main compounds found were Kaempferol 3-diglucoside-7-glucoside and its combinations with different hydroxycinnamic acids. Moreover, some flavonoids with an unusual high grade of glycosylation have been isolated and tentatively identified for the first time. To our knowledge, the characterization of flavonoids with more than four sugars has not been previously reported. The new products isolated were tentatively identified as Kaempferol 3-diglucoside-7-diglucoside, Kaempferol 3-triglucoside-7-diglucoside, Kaempferol 3-feruloyldiglucoside-7-diglucoside, Kaempferol 3-sinapoyltriglucoside-7-glucoside, Kaempferol 3-disinapoyltriglucoside-7-glucoside, Kaempferol 3-sinapoyltriglucoside-7-diglucoside and Kaempferol 3-disinapoyltriglucoside-7-diglucoside.
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hplc dad ms ms esi characterization of unusual highly glycosylated acylated flavonoids from cauliflower brassica oleracea l var botrytis agroindustrial byproducts
Journal of Agricultural and Food Chemistry, 2003Co-Authors: Rafael Llorach, Federico Ferreres, Angel Gilizquierdo, Francisco A TomasbarberanAbstract:In a recent program to investigate the possible use of vegetable handling and commercialization wastes and residues as a source of potentially bioactive extracts, we have studied cauliflower byproducts. A total of twenty-eight compounds were characterized by HPLC-DAD-MS, of these, twenty-two are produced naturally by the plant. The main compounds found were Kaempferol 3-diglucoside-7-glucoside and its combinations with different hydroxycinnamic acids. Moreover, some flavonoids with an unusual high grade of glycosylation have been isolated and tentatively identified for the first time. To our knowledge, the characterization of flavonoids with more than four sugars has not been previously reported. The new products isolated were tentatively identified as Kaempferol 3-diglucoside-7-diglucoside, Kaempferol 3-triglucoside-7-diglucoside, Kaempferol 3-feruloyldiglucoside-7-diglucoside, Kaempferol 3-sinapoyltriglucoside-7-glucoside, Kaempferol 3-disinapoyltriglucoside-7-glucoside, Kaempferol 3-sinapoyltriglucosid...
Lawrence Onyango Arot Manguro - One of the best experts on this subject based on the ideXlab platform.
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flavonol and iridoid glycosides of ajuga remota aerial parts
Phytochemistry, 2006Co-Authors: Lawrence Onyango Arot Manguro, Samuel Otieno Wagai, Peter LemmenAbstract:Six flavonol glycosides characterised as myricetin 3-O-alpha-rhamnosyl-(1'''-->2'')-alpha-rhamnoside-3'-O-alpha-rhamnoside, 5'-O-methylmyricetin 3-O-[alpha-rhamnosyl (1'''-->2'')][alpha-rhamnosyl (1''''-->4'')]-beta -glucoside-3'-O-beta-glucoside, 5'-O-methylmyricetin 3-O-alpha-rhamnosyl (1'''-->2'')-alpha-rhamnoside 3'-O-beta-galactoside, kaemferol 3-O-rutinoside-7-O-rutinoside, myricetin 3-O-rutinoside-3'-O-alpha-rhamnoside, myricetin 3-O-beta-glucosyl (1'''-->2'')-beta-glucoside-4'-O-beta-glucoside together with two iridoid glycosides identified as 6,8-diacetylharpagide and 6,8-diacetylharpagide-1-O-beta-(3',4'-di-O-acetylglucoside) have been isolated from extract of Ajuga remota aerial parts. Also isolated from the same extract were known compounds; Kaempferol 3-O-alpha-rhamnoside, quercetin 3-O-beta-glucoside, quercetin 3-O-rutinoside, 8-acetylharpagide, ajugarin I and ajugarin II.
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flavonol glycosides of warburgia ugandensis leaves
Phytochemistry, 2003Co-Authors: Lawrence Onyango Arot Manguro, Peter Lemmen, Rudolf HermannAbstract:Abstract Four new flavonol glycosides: kaempferide 3- O -β-xylosyl (1→2)-β-glucoside, Kaempferol 3- O -α-rhamnoside-7,4′-di- O -β-galactoside, Kaempferol 3,7,4′-tri- O -β-glucoside and quercetin 3- O -[α-rhamnosyl (1→6)] [β-glucosyl (1→2)]-β-glucoside-7- O -α-rhamnoside, were characterized from a methanolic leaf extract of Warburgia ugandensis . The known flavonols: Kaempferol, Kaempferol 3-rhamnoside, Kaempferol 3-rutinoside, myricetin, quercetin 3-rhamnoside, Kaempferol 3-arabinoside, quercetin 3-glucoside, quercetin, Kaempferol 3-rhamnoside-4′-galactoside, myricetin 3-galactoside and Kaempferol 3-glucoside were also isolated. Structures were established by spectroscopic and chemical methods and by comparison with authentic samples.
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flavonol glycosides of warburgia ugandensis leaves
Phytochemistry, 2003Co-Authors: Lawrence Onyango Arot Manguro, Peter Lemmen, Ivar Ugi, Rudolf HermannAbstract:Four new flavonol gycosides: kaempferide 3-O-beta-xylosyl (1-->2)-beta-glucoside, Kaempferol 3-O-alpha-rhamnoside-7,4'-di-O-beta-galactoside, Kaempferol 3,7,4'-tri-O-beta-glucoside and quercetin 3-O-[alpha-rhamnosyl (1-->6)] [beta-glucosyl (1-->2)]-beta-glucoside-7-O-alpha-rhamnoside, were characterized from a methanolic leaf extract of Warburgia ugandensis. The known flavonols: Kaempferol, Kaempferol 3-rhamnoside, Kaempferol 3-rutinoside, myricetin, quercetin 3-rhamnoside, Kaempferol 3-arabinoside, quercetin 3-glucoside, quercetin, Kaempferol 3-rhamnoside-4'-galactoside, myricetin 3-galactoside and Kaempferol 3-glucoside were also isolated. Structures were established by spectroscopic and chemical methods and by comparison with authentic samples.
