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Applications of Liquid-Chromatography Tandem Mass Spectrometry in Natural Products Research: Tropane Alkaloids as a Case Study
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Alkaloids from Tabernaemontana psorocarpa.

T A van Beek1, R Verpoorte, A Baerheim Svendsen

  • 1Department of Pharmacognosy, Gorlaeus Laboratories, Leiden, The Netherlands.

Planta Medica
|February 1, 1983
PubMed
Summary

Two Tabernaemontana psorocarpa bark samples yielded 16-epi-isositsirikine as the main alkaloid. Minor alkaloids varied between samples, including several identified compounds.

Area of Science:

  • Phytochemistry
  • Natural Products Chemistry
  • Pharmacognosy

Background:

  • Tabernaemontana psorocarpa is a plant species known for its rich alkaloid content.
  • Alkaloids derived from plant sources are extensively studied for their diverse pharmacological properties.
  • Understanding the chemical composition of medicinal plants is crucial for drug discovery.

Purpose of the Study:

  • To isolate and identify the alkaloid constituents present in the stem bark of Tabernaemontana psorocarpa.
  • To compare the alkaloid profiles of two distinct samples of the same plant species.
  • To contribute to the phytochemical knowledge base of Tabernaemontana psorocarpa.

Main Methods:

  • Extraction of alkaloids from the stem bark of Tabernaemontana psorocarpa.

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  • Chromatographic separation techniques for isolating individual compounds.
  • Spectroscopic methods (e.g., NMR, MS) for structural elucidation and identification of alkaloids.

    • Main Results:

    • 16-epi-isositsirikine was identified as the predominant alkaloid in both analyzed samples.
    • A variation in the number and relative quantities of minor alkaloids was observed between the two samples.
    • Minor alkaloids identified include 12-methoxy-14,15-dehydro-vincamine, vallesiachotamine, isovallesiachotamine, tetrahydroalstonine, coronaridine, and voacangine.

    Conclusions:

    • The phytochemical analysis confirms the presence of a complex alkaloid mixture in Tabernaemontana psorocarpa stem bark.
    • The observed variability in alkaloid composition highlights the importance of sample-specific analysis.
    • The identified alkaloids represent potential leads for further pharmacological investigation and natural product drug development.