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Chemical Investigation of the Constitutive Flavonoid Glycosides of the Leaves of Crataegus sinaica
Amani M. D. El-Mousallamy 한국생약학회 1998 Natural Product Sciences Vol.4 No.2
Leaves of Crataegus sinaica Boiss, contain the new C-glycosyl flavone 3$quot;`,4$quot;`-di-O-acetyl-2$quot;-O-α-rhamnosylvitexin, together with the hitherto unknown, dihydroflavonol 3-O-xyloside, (2R:3R)-dihydroquercetin-3-O-β-xylopyranoside. The known compounds (+)-catechin, (-)-epicatechin, vicenin-II, 2$quot;-O-α-rhamnosylvitexin, and 4$quot;`-O-acetyl-2$quot;-O-α-rhamnosylvitexin were also characterized. Structures were established by conventional methods of analysis and confirmed by ¹H-, <sup>13</sup>C-NMR, and ESI-MS.
Ahmed M. A. Souleman,Amani M. D. El-Mousallamy 한국생약학회 2000 Natural Product Sciences Vol.6 No.2
The aqueous ethanolic whole plant extract of Rosa arabica was found to contain the new natural dimeric phenolic compound, ellagic acid 3,3`-dimethyl ether 4-O-α-rhamnopyranoside, 9, along with ten known phenolic metabolites (1-8, 10 and 11). Structures of all compounds (1-11) were established by routine methods of analysis and confirmed by FAB-MS, ¹H and <sup>13</sup>C NMR spectral analysis.
Unique Phenolic Sulphate Conjugates from the Flowers of Tamarix amplexicaulis
Sahar A. M. Hussein,Amani M. D. El-Mousallamy,Mahmoud A. M. Nawwar,Ahmed A. M. Souleman,Heba H. Barakat 한국생약학회 1998 Natural Product Sciences Vol.4 No.4
The unique sulphated phenolics, gallic acid 3-methyl ether 5-potassium sulphate, isoferulic acid 3-potassium sulphate, and ellagic acid 4,4`-dimethyl ether 3-potassium sulphate have been isolated from the flowers of Tamarix amplexicaulis Ehrenb. (Tamaricaceae). The hitherto unknown natural phenolic acid, gallic acid 3-methyl ether, together with the known phenolic, gallic acid, gallic acid 4-methyl ether, isoferulic acid, ferulic acid, ellagic acid, and ellagic acid 4,4`-dimethyl ether have been also separated and characterized. The structures were established by conventional methods, including electrophoretic analysis and confirmed by ESIMS, ¹H- and <sup>13</sup>C-NMR.
Polyphenolic Metabolites of the Flowers of Tamarix tetragyna
Sahar A. M. Hussein,Mahmoud A. M. Nawwar,Amani M. D. El Mousallami 한국생약학회 2000 Natural Product Sciences Vol.6 No.4
Phytochemical study of the constitutive polyphenolics of the flower aqueous alcohol extract of Tamarix tetragyna was carried out. The new sulphated flavonol, quercetin 3`,4`-dimethyl ether 3-O-KSO₃ as well as the new natural galloyl glucose, 2-O-galloyl-(α.β)⁴-⁴C₁-glucopyranose were isolated and characterised. The known sulphated flavonols, kaempferol 7,4-dimethyl ether 3,5-di-O-KSO₃, quercetin 7-methyl ether 3,3`,4`-tri-O-KSO₃, quercetin 7,4`-dimethyl ether 3-O-KSO₃ and quercetin 3-O-KSO₃ and the known sulphated phenolics, isoferulic acid 3-O-KSO₃ and ellagic acid 4,4`-dimethyl ether 3-O-KSO₃ were also separated and identified. The structures were established by conventional methods of analysis and confirmed by ¹H-, <sup>13</sup>C-NMR and negative ESI-mass spectrometry. 2D-homonuclear chemical shift correlation NMR experiment was applied for the new natural galloylglucose.