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Phenolic glycosides from Dirca palustris.

R S Ramsewak1, M G Nair, D L DeWitt

  • 1Department of Horticulture and National Food Safety and Toxicology Center, and Department of Biochemistry, Michigan State University, East Lansing, Michigan 48824, USA.

Journal of Natural Products
|December 2, 1999
PubMed
Summary

Five new compounds from Dirca palustris twigs were studied. Compounds 1-4 showed antioxidant activity, while compounds 4 and 5 offered mild inhibition of cyclooxygenase I (COX-I) enzymes.

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Area of Science:

  • Phytochemistry
  • Natural Products Chemistry
  • Pharmacology

Background:

  • Dirca palustris, commonly known as eastern leatherwood, is a plant species with a history of traditional medicinal use.
  • Phenolic glycosides are a class of natural compounds known for diverse biological activities.
  • Investigating novel compounds from plant sources is crucial for discovering new therapeutic agents.

Purpose of the Study:

  • To isolate and characterize novel phenolic glycosides from Dirca palustris.
  • To evaluate the isolated compounds for their inhibitory activity against cyclooxygenase I (COX-I) and cyclooxygenase II (COX-II) enzymes.
  • To assess the antioxidant potential of the isolated compounds using a liposome assay.

Main Methods:

  • Extraction of dried twigs of Dirca palustris using methanol.

Related Experiment Videos

  • Isolation and purification of five novel phenolic glycosides (compounds 1-5).
  • Structural elucidation using spectroscopic techniques including 1H NMR, 13C NMR, and Mass Spectrometry (MS).
  • Enzyme inhibition assays for COX-I and COX-II.
  • Liposome-based antioxidant activity assay.

    • Main Results:

    • Five novel phenolic glycosides, designated compounds 1-5, were successfully isolated and characterized.
    • Compounds 1-3 exhibited no significant inhibition against COX-I.
    • Compounds 4 and 5 demonstrated moderate COX-I inhibition (12.5% and 9.2%, respectively) at tested concentrations.
    • None of the compounds showed inhibitory activity against COX-II.
    • Compounds 1-4 displayed antioxidant activity, with compound 2 being the most potent, while compound 5 lacked antioxidant effects.

    Conclusions:

    • The study successfully identified five new phenolic glycosides from Dirca palustris.
    • The isolated compounds possess varying degrees of antioxidant and COX-I inhibitory activities.
    • Compound 2 is a promising antioxidant, and compounds 4 and 5 show mild COX-I inhibition, suggesting potential for further investigation.