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New Dimeric Phenolic Conjugates from the Wood of Tamarix tetragyna
Hussein, Sahar A.M. The Korean Society of Pharmacognosy 1997 Natural Product Sciences Vol.3 No.2
Two new dimeric phenolic conjugates, 2,3-di-O-dehydrodigallicmonocarboxyl-$({\alpha},{\beta})$-$^4C_1$-glucopyranose and ellagic acid 3,3'-dimethylether-4-0-$SO_3K$ were isolated from the debarked heart wood of Tamarix tetragyna (Tamaricaceae) along with the known phenolic compounds, isoferulic acid, ferulic acid, gallic acid, gallic acid 4-methyl ether, syringic acid, ellagic acid 3,3'-dimethyl ether and ellagic acid. All structures were determined mostly by ESI-MS, ID and 2D-NMR spectroscopy.
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.
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.