Journal of
Medicinal Plants Research

  • Abbreviation: J. Med. Plants Res.
  • Language: English
  • ISSN: 1996-0875
  • DOI: 10.5897/JMPR
  • Start Year: 2007
  • Published Articles: 3834

Full Length Research Paper

Terpenoids from Phaulopsis imbricata (Acanthaceae)

Archile Bernabe Ouambo Kengne
  • Archile Bernabe Ouambo Kengne
  • Laboratory of Natural Products Chemistry, Chemistry Department, University of Dschang, P. O. Box 67 Dschang, Cameroon.
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Mathieu Tene*
  • Mathieu Tene*
  • Laboratory of Natural Products Chemistry, Chemistry Department, University of Dschang, P. O. Box 67 Dschang, Cameroon.
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Alembert Tiabou Tchinda
  • Alembert Tiabou Tchinda
  • Laboratory of Phytochemistry, Institute of Medical Research and Medicinal Plant Studies, (IMPM), P.O. Box 6163, Yaoundé, Cameroon.
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Pierre Tane
  • Pierre Tane
  • Laboratory of Natural Products Chemistry, Chemistry Department, University of Dschang, P. O. Box 67 Dschang, Cameroon.
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Michel Frédérich
  • Michel Frédérich
  • Laboratory of Pharmacognosy, Interfaculty Centre for Research on Medicine (CIRM), Department of Pharmacy, University of Liège, B36, B-4000, Liège, Belgium.
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  •  Received: 08 December 2015
  •  Accepted: 16 February 2016
  •  Published: 10 March 2016

Abstract

The whole plant of Phaulopsis imbricata (Forssk.) Sweet (Acanthaceae) was collected at Bansoa, Cameroon, shade dried and extracted by maceration in methanol. This study was carried out to isolate secondary metabolites from this plant species that has not been investigated so far. Two lupane-type triterpenoids, one β-type carotenoid, one eudesmane-type sesquiterpenoid, and one sterol glycoside were isolated from the dried methanol extract using solvent partitioning, column chromatography and re-crystallization. They were identified as lupeol, betulin, (all-E)-lutein, cryptomeridiol, and sitosterol 3-O-β-D-glucopyranoside, respectively. The structures of the isolated compounds were elucidated on the basis of spectroscopic methods including 1D- and 2D- nuclear magnetic resonance (NMR), infrared (IR) and mass spectrometry (MS). This is the first report of these compounds from the genus Phaulopsis. To the best of our knowledge, P. imbricata is also the first species of the genus to be phytochemically studied.

Key words: Phaulopsis imbricata, chromatography, spectroscopy, terpenoids, lupeol, betulin, (all-E)-lutein, cryptomeridiol.

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