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Bioactive alkaloids from Brunsvigia radulosa.

W E Campbell1, J J Nair, D W Gammon

  • 1Chemistry Department, University of Cape Town, Rondeboch, South Africa. skoonin@uctgsh1.uct.ac.za

Phytochemistry
|March 21, 2000
PubMed
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Researchers identified a new alkaloid, 1-O-acetylnorpluviine, from Brunsvigia radulosa bulbs. These plant-derived alkaloids were evaluated for antimalarial and anticancer activities.

Area of Science:

  • Phytochemistry
  • Natural Products Chemistry
  • Medicinal Chemistry

Background:

  • Brunsvigia radulosa bulbs are a potential source of bioactive natural products.
  • Alkaloids are a diverse class of compounds with significant pharmacological properties.

Purpose of the Study:

  • To isolate and characterize phytochemicals from Brunsvigia radulosa bulbs.
  • To evaluate the biological activities of the isolated alkaloids, including antimalarial and cytotoxic effects.

Main Methods:

  • Phytochemical investigation using spectroscopic methods (NMR, MS) for structure elucidation.
  • Correction of existing spectroscopic assignments for known alkaloids using 2D NMR.
  • Chemical conversion of crinamine to apohaemanthamine for further testing.
  • In vitro testing against Plasmodium falciparum strains and BL6 mouse melanoma cells.

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Main Results:

  • Isolation and identification of a new alkaloid, 1-O-acetylnorpluviine.
  • Identification of known alkaloids: 1-epideacetylbowdensine, crinamine, crinine, hamayne, lycorine, anhydrolycorin-6-one, and sternbergine.
  • Correction of 13C NMR assignments for crinamine and hamayne.
  • Apohaemanthamine was synthesized from crinamine.
  • Preliminary data on antimalarial and cytotoxic activities of the alkaloids.

Conclusions:

  • Brunsvigia radulosa bulbs contain a rich profile of alkaloids, including a novel compound.
  • Spectroscopic techniques, particularly 2D NMR, are crucial for accurate structure determination and refinement.
  • The isolated and modified alkaloids warrant further investigation for their therapeutic potential against malaria and cancer.