Essential Oil of Zanthoxylum lepreurii Guill. & Perr. Rich in Undecan-2-One and Tridecan-2-One

The leaves and stem of Zanthoxylum lepreurii were collected in two localities of Cote d'Ivoire, namely San-Pedro (South-east) and Adzope (South). The collects were submitted to hydrodistillation with the Clevenger apparatus. The oils obtained were investigated by C-13 NMR spectroscopy, GC (RI) and GC-MS. Thus, twenty-eight components accounting for 90.9-96.8 % were identified. Essential oils from leaves and stem bark of Z. leprieurii exhibited the predominance of two acyclic ketones. Undecan-2-one and tridecan-2-one have been identified as the main components. Undecan-2-one was found in abundance in the stem (30.3 %) and the leaves (10.0 %) respectively in Adzope and San-Pedro, while tridecan-2-one characterized all the samples (15.5 %-77.2 %). In addition with monoterpenoids and sesquiterpenoids identified as major components led to the new chemotypes of Z. leprieurii essential oil.