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Bioactive aristolactams from Piper umbellatum.

Turibio Kuiate Tabopda1, Joseph Ngoupayo, Jiawei Liu

  • 1Laboratoire de Chimie Organique des Substances Naturelles, LC3-UMR 7177 CNRS, Université Louis Pasteur, Centre de Neurochimie, 5 Rue Blaise Pascal, 67084 Strasbourg, France. ttabopda@yahoo.fr

Phytochemistry
|April 11, 2008
PubMed
Summary

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Four new alkaloids from Piper umbellatum branches demonstrated significant alpha-glucosidase enzyme inhibition, antioxidant, and antifungal activities. These findings highlight the plant

Area of Science:

  • Phytochemistry
  • Natural Products Chemistry
  • Pharmacology

Background:

  • Piper umbellatum is a plant species with a history of traditional medicinal use.
  • The chemical constituents of Piper species are known to possess diverse biological activities.
  • Isolation and characterization of novel compounds from medicinal plants are crucial for drug discovery.

Purpose of the Study:

  • To isolate and identify chemical constituents from the branches of Piper umbellatum.
  • To evaluate the glycosidase inhibition, antioxidant, and antifungal activities of the isolated compounds.
  • To discover new bioactive molecules for potential therapeutic applications.

Main Methods:

  • Phytochemical investigation involving extraction and chromatographic separation techniques (e.g., column chromatography, HPLC).

Related Experiment Videos

  • Spectroscopic methods (e.g., NMR, Mass Spectrometry) for structure elucidation of isolated compounds.
  • In vitro assays to assess alpha-glucosidase inhibition, DPPH radical scavenging activity, and antifungal activity against selected pathogens.

    • Main Results:

    • Four new alkaloids, piperumbellactams A-D (1-4), were isolated along with seven known compounds.
    • Compounds 1-3 exhibited moderate alpha-glucosidase enzyme inhibition, with IC50 values ranging from 29.64±0.46 to 98.07±0.44 μM.
    • Compounds 2, 3, and 6 showed potent DPPH radical scavenging activity, while compounds 4, 5, and 7 displayed potent antifungal activity.

    Conclusions:

    • The study successfully isolated and characterized novel alkaloids from Piper umbellatum.
    • The isolated compounds, particularly piperumbellactams A-D, possess promising alpha-glucosidase inhibitory, antioxidant, and antifungal properties.
    • These findings support the ethnobotanical uses of Piper umbellatum and suggest its potential as a source for new therapeutic agents.