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Iridoids from Avicennia marina.

K H Shaker1, M H Elgama, K Seifert

  • 1University of Bayreuth, Organic Chemistry I/2, Germany.

Zeitschrift Fur Naturforschung. C, Journal of Biosciences
|February 12, 2002
PubMed
Summary

Three new iridoid glucosides were isolated from Avicennia marina, along with a known compound. Their structures were elucidated using advanced Nuclear Magnetic Resonance (NMR) spectroscopy techniques.

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Area of Science:

  • Phytochemistry
  • Natural Products Chemistry
  • Organic Chemistry

Background:

  • Avicennia marina is a plant species known for its diverse secondary metabolites.
  • Iridoid glucosides are a class of compounds with various reported biological activities.
  • Isolation and structural elucidation of novel natural products contribute to understanding plant chemical diversity.

Purpose of the Study:

  • To isolate and characterize new iridoid glucosides from Avicennia marina.
  • To determine the chemical structures of isolated compounds using spectroscopic methods.
  • To contribute to the knowledge of iridoid glucoside chemistry in Avicennia species.

Main Methods:

  • Isolation of compounds using chromatographic techniques.
  • Structure determination primarily by Nuclear Magnetic Resonance (NMR) spectroscopy.
  • Detailed NMR analysis including 1H-1H COSY, HMQC, and HMBC experiments for signal assignment.

Main Results:

  • Isolation of three new iridoid glucosides: 10-O-[(E)-cinnamoyl]-geniposidic acid, 10-O-[(E)-p-coumaroyl]-geniposidic acid, and 10-O-[(E)-caffeoyl]-geniposidic acid.
  • Isolation of the known iridoid glucoside, 2'-O-[(E)-cinnamoyl]-mussaenosidic acid.
  • Complete structural elucidation of all isolated compounds based on comprehensive spectroscopic data.

Conclusions:

  • The study successfully identified and characterized novel iridoid glucosides from Avicennia marina.
  • NMR spectroscopy, particularly 2D NMR techniques, proved effective for structural assignment.
  • The findings expand the known chemical profile of Avicennia marina and iridoid glucosides.

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