Essential Oil of Plectranthus tenuicaulis Leaves from Gabon, Source of (R),(E)-6,7-Epoxyocimene. An Unusual Chemical Composition within the Genus Plectranthus

Author:

Agnaniet Huguette1,Agrebi Abdelhamid2,Bikanga Raphaël1,Makani Thomas1,Lebibi Jacques1,Casabianca Hervé3,Morère Alain2,Menut Chantal2

Affiliation:

1. Laboratoires de Substances Naturelles et de Synthèses Organométalliques (LASNSOM), Université des Sciences et Techniques de Masuku B.P. 943, Franceville, Gabon

2. Equipe Glycochimie, Institut des Biomolécules Max Mousseron (IBMM)-UMR 5247, ENSCM, 8, rue de l'Ecole Normale, 34296 Montpellier Cedex 5, France

3. Service Central d'Analyse-CNRS-Echangeur de Solaize, Chemin du Canal, 69360, Solaize, France

Abstract

Water distilled essential oils from leaves of Plectranthus tenuicaulis (Hook. f.) J. K. Morton collected in Gabon were analyzed using GC-FID and GC-MS. The main constituent, unusual within the genus Plectranthus, was isolated and formally identified as being the (+)-( R)-enantiomer of ( E)-6,7-epoxyocimene [( E)-myroxide]. This enantiomer, which represents about 75% of the essential oil, has been previously identified as a pheromone emitted by the male fruit-spotting bug Amblypelta nitida; this insect is responsible of destruction of most fruit crops in tropical and subtropical areas. The potential application of P. tenuicaulis essential oil in crop protection programs is discussed and the atypical chemical profile of the gabonese essential oil is compared with those previously reported in the genus Plectranthus (or Coleus).

Publisher

SAGE Publications

Subject

Complementary and alternative medicine,Plant Science,Drug Discovery,Pharmacology,General Medicine

Reference52 articles.

1. HutchinsonJ, DalzielJM. (1963) Flora of West Tropical Africa. 2nd Ed. HepperF. N. (Ed). London, Vol 1, 458–460.

2. Plectranthus: A review of ethnobotanical uses

3. Phylogeny and evolution of basils and allies (Ocimeae, Labiatae) based on three plastid DNA regions

4. Chemistry of the Genus Plectranthus

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