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Tropical Journal of Pharmaceutical Research
Pharmacotherapy Group, Faculty of Pharmacy, University of Benin, Benin City, Nigeria
ISSN: 1596-5996
EISSN: 1596-9827
Vol. 11, No. 2, 2012, pp. 259-262
Bioline Code: pr12032
Full paper language: English
Document type: Research Article
Document available free of charge

Tropical Journal of Pharmaceutical Research, Vol. 11, No. 2, 2012, pp. 259-262

 en Isolation and Characterization of Lup-20(29)-ene-3, 28-diol (Betulin) from the Stem-Bark of Adenium obesum ( Apocynaceae) check for this species in other resources
Tijjani, A; Ndukwe, IG & Ayo, RG

Abstract

Purpose: To isolate and characterize chemical compound(s) of biological importance from the stembark of the plant, Adenium obesum check for this species in other resources .
Methods: The stem-bark, after air-drying and powdering, was subjected to sequential hot-continuous extraction using petroleum spirit (60 - 80 oC) and methanol in that order. The petroleum spirit extract was chromatographed using thin layer and column chromatographic techniques. Recrystallization was used to further purify the isolated compound. Characterization of the isolated compound was by melting point, as well as by 1H and 13C nuclear magnetic resonance spectroscopy (NMR) and mass spectrometry (MS).
Results: A triterpenoid (lup-20(29)-ene-3, 28-diol), commonly known as betulin, was isolated from the crude petroleum ether extract of the plant stem-bark. The isolated compound’s melting point was 256 - 257 °C. The name, betulin, was assigned to this compound by comparison of its spectroscopic data from 1H-NMR, 13C-NMR and MS analysis with those of authenticated samples reported in the literature.
Conclusion: A known compound, betulin ( lup-20(29)-ene-3, 28-diol) was isolated from the petroleum ether extract of the stem-bark of Adenium obesum.

Keywords
Adeniumobesum, Stem bark, Isolation, lup-20(29)-ene-3,28-diol, Betulin

 
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