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Theophylline, a member of the methylxanthine class of bronchodilators, has long been used in asthma management. While its exact mechanism of action is not fully understood, it is believed to have multiple effects on various cellular processes.
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A new xanthone from Garcinia nitida.

G C L Ee1, C H Foo, V Y M Jong

  • 1Department of Chemistry, Faculty of Science, University Putra Malaysia, Serdang 43400 UPM, Selangor, Malaysia. gwen@science.upm.edu.my

Natural Product Research
|November 3, 2011
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Summary
This summary is machine-generated.

Researchers isolated five xanthones from Garcinia nitida stem bark, including a novel compound. Structural elucidation utilized advanced nuclear magnetic resonance (NMR) spectroscopy and mass spectrometry (MS) techniques.

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Area of Science:

  • Phytochemistry
  • Natural Product Chemistry
  • Organic Chemistry

Background:

  • Garcinia species are known sources of bioactive compounds.
  • Xanthones are a significant class of natural products with diverse biological activities.
  • The chemical composition of Garcinia nitida remains incompletely characterized.

Purpose of the Study:

  • To conduct a detailed chemical investigation of the stem bark of Garcinia nitida.
  • To isolate and characterize xanthone constituents from this plant species.
  • To identify any novel compounds present in the extract.

Main Methods:

  • Extraction and isolation of compounds from Garcinia nitida stem bark.
  • Structure elucidation using 1-D and 2-D Nuclear Magnetic Resonance (NMR) spectroscopy (¹H, ¹³C, DEPT, COSY, HMBC, HMQC).
  • Determination of molecular masses using Mass Spectrometry (MS) techniques.

Main Results:

  • Five xanthones were successfully isolated from the stem bark.
  • The isolated compounds include inophyllin B, osajaxanthone, 3-isomangostin, and rubraxanthone.
  • A new xanthone, 1,6-dihydroxy-5-methoxy-6,6-dimethylpyrano[2',3':2,3]-xanthone, was identified.

Conclusions:

  • The chemical study successfully identified five xanthones from Garcinia nitida stem bark.
  • The structural characterization confirmed the presence of known xanthones and one novel compound.
  • This research contributes to the understanding of the phytochemical profile of Garcinia nitida.