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Secondary metabolites from Andrographis paniculata.

Wenkui Li1, Xudong Xu, Hongjie Zhang

  • 1Department of Medicinal Chemistry and Pharmacognosy (m/c 781), University of Illinois at Chicago, IL 60612, USA.

Chemical & Pharmaceutical Bulletin
|March 3, 2007
PubMed
Summary

Two new compounds and andrographic acid were isolated from Andrographis paniculata. Andrographolide and isoandrographolide showed significant cytotoxicity against KB cells.

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Area of Science:

  • Phytochemistry
  • Natural Products Chemistry
  • Pharmacology

Background:

  • Andrographis paniculata is a medicinal plant with a history of traditional use.
  • The plant is known to contain various bioactive compounds, including flavonoids and diterpenoids.
  • Further investigation is needed to identify and characterize novel compounds and evaluate their biological activities.

Purpose of the Study:

  • To isolate and elucidate the structures of new compounds from Andrographis paniculata.
  • To evaluate the cytotoxic activity of isolated compounds against KB cells.

Main Methods:

  • Phytochemical investigation involving extraction and isolation techniques.
  • Structure elucidation using physicochemical and spectroscopic analyses (NMR, MS).

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  • Cytotoxicity assays (e.g., MTT assay) to determine ED50 values.

    • Main Results:

    • Two new flavonoid glycosides (1, 2) and a new diterpenoid (andrographic acid, 3) were isolated and characterized.
    • Andrographidine A (4) was also identified.
    • Andrographolide and isoandrographolide exhibited significant cytotoxicity against KB cells with ED50 values of 6.5 and 5.1 μg/mL, respectively.
    • Compounds 1, 2, 3, and 4 did not show significant cytotoxicity.

    Conclusions:

    • Andrographis paniculata is a rich source of novel bioactive phytochemicals.
    • Andrographolide and isoandrographolide possess notable cytotoxic properties, suggesting potential as anticancer agents.
    • Further research into the mechanism of action and therapeutic potential of these compounds is warranted.