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[Saponins from Thinouia coriacea].

E P Schenkel1, W Werner, K E Schulte

  • 1Faculdade de Farmàcia, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.

Planta Medica
|October 1, 1991
PubMed
Summary

This study isolated eight oleanolic acid glycosides from Thinouia coriacea stems, a South Brazilian plant. These compounds, including various saponins, were also found in the roots but not the leaves.

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Area of Science:

  • Phytochemistry
  • Natural Products Chemistry
  • Organic Chemistry

Context:

  • Thinouia coriacea Britton (Sapindaceae) is an ichthyotoxic plant native to South Brazil.
  • The plant's chemical constituents, particularly saponins, are of interest for their potential bioactivity.
  • Previous research on T. coriacea may not have fully elucidated its oleanolic acid glycoside profile.

Purpose:

  • To isolate and structurally elucidate oleanolic acid glycosides from the stems of Thinouia coriacea.
  • To characterize the identified compounds using spectroscopic methods like 13C-NMR and mass spectrometry.
  • To investigate the distribution of these saponins in different plant parts (stems, roots, leaves).

Summary:

  • Eight oleanolic acid glycosides were isolated from the stems of Thinouia coriacea.
  • Structures were determined through partial hydrolysis, 13C-NMR, and mass spectrometry, revealing complex glycosidic linkages.
  • Saponins 1-6 and 8 were fully characterized, while saponin 7's sugar attachment remained unclear.
  • The same saponins were detected in the roots, but were absent in the leaves.

Impact:

  • Provides a detailed phytochemical profile of Thinouia coriacea stems, focusing on oleanolic acid glycosides.
  • Contributes to the understanding of saponin diversity and distribution within the Sapindaceae family.
  • Offers valuable data for potential pharmacological or toxicological investigations of these compounds.
  • Highlights the importance of plant part-specific analysis in natural product research.

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