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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.
Sulphated Flavonols og rhe Flowers of Tamarix amplexicaulis
Ahmed M. A. Souleman 한국생약학회 1998 Natural Product Sciences Vol.4 No.4
A new flavonol 3,5-di-O-KSO₃ : kaempferol 7,4`-dimethyl ether 3,5-O-KSO₃, was isolated and identified from the flowers of Tamarix amplexicaulis. The known compounds quercetin 3-mono-O-KSO₃, kaempferol 4`-methyl ether 3-mono-OKSO₃, kaempferol 7,4`-dimethyl ether 3-O-KSO₃, quercetin 7,4`-dimethyl ether 3-mono-D-KSO₃, kaempferol 3-O-glueuronide and quercetin 3-O-glucuronide were also separated and identified. Structures were established by conventional methods, including electrophoretic analysis, and confirmed by negative FAB-MS, ¹H- and <sup>13</sup>C-NMR.
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.