• 제목, 요약, 키워드: Dimethyl ellagic acid

검색결과 3건 처리시간 0.066초

Unique Phenolic Sulphate Conjugates from the Flowers of Tamarix amplexicaulis

  • Souleman, Ahmed A.M.;Barakat, Heba H.;Hussein, Sahar A.M.;El-Mousallamy, Amani M.D.;Nawwar, Mahmoud A.M.
    • Natural Product Sciences
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    • v.4 no.4
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    • pp.245-252
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    • 1998
  • 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 ESI-MS, $^1H-\;and\;^{13}C-NMR$.

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Activity Guided Isolation of Antioxidant Tannoid Principles from Anogeissus latifolia

  • Govindarajan, Raghavan;Vijayakumar, Madhavan;Shirwaikar, Annie;Rawat, Ajay Kumar Singh;Mehrotra, Shanta;Pushpangadan, Palpu
    • Natural Product Sciences
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    • v.11 no.3
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    • pp.174-178
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    • 2005
  • Oxidative stress is an important causative factor in several human chronic diseases, such as atherosclerosis, cardiovascular disorders, mutagenesis, cancer, several neurodegenerative disorders, and the aging process. Phenolics and tannins are reported to be good antioxidants. Anogeissus latifolia (Combretaceae) bark has been used in the Indian traditional systems of medicine for curing a variety of ailments, but scientific validation is not available till date. Hence the present study was undertaken to isolate antioxidant compounds by activity-guided isolation. Inhibtion of diphenyl picryl hydrazyl (DPPH) and Xanthine oxidase along with photochemiluminescence assay were used as bioassay for antioxidant activity. Activity guided isolation was carried out using silica column and the compounds were quantified using HPLC. Ethyl acetate and butanol fraction exhibited potent antioxidant activity. Bioassay-guided isolation led to isolation of ellagic acid (1) and dimethyl ellagic acid (2) as the main active compounds, which along with gallic acid were quantified by HPLC. Thus we conclude that these three major tannoid principles present in A. latifolia, are responsible for the antioxidant potential and possibly their therapeutic potential.

Chemical Investigation of the Constitutive Phenolics of Rosa arabica; the Structure of a New Dimeric Phenolic Glycoside

  • Souleman, Ahmed M.A.;El-Mousallamy, Amani M.D.
    • Natural Product Sciences
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    • v.6 no.2
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    • pp.82-85
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    • 2000
  • 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 $4-O-{\alpha}-rhamnopyranoside$, 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, $^1H\;and\;^{13}C$ NMR spectral analysis.

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