Chemical Constituents of Essential Oil from the Leaves of Ipomoea batatas L. (Lam.)
Abul Razaq O. Ogunmoye
Department of Chemistry, Crescent University, Abeokuta, Nigeria
Muritala A. Adebayo
Department of Pharmacognosy, Igbinedion University, Okada, Edo State, Nigeria
Ebije Inikpi
Natural Products Research Unit, Department of Chemistry, Faculty of Science, Lagos State University, P.M.B. 0001 LASU Post Office, Ojo, Lagos, Nigeria
Isiaka A. Ogunwande *
Natural Products Research Unit, Department of Chemistry, Faculty of Science, Lagos State University, P.M.B. 0001 LASU Post Office, Ojo, Lagos, Nigeria
*Author to whom correspondence should be addressed.
Abstract
The essential oil, obtained by hydrodistillation in an all glass Clevenger apparatus, from the air-dried leaves of Ipomoea batatas L. (Lam.) growing in Nigeria was analyzed by gas chromatography-flame ionization detector (GC-FID) and gas chromatography coupled with mass spectrometry (GC/MS). Forty-one constituents representing 93.5% of the oil were identified from the GC/MS spectra. Monoterpenes (22.0%), sesquiterpenes (46.5%) and diterpenes (22.5%) were the classes of compounds identified in the oil. The main constituents of the oil were abietadiene (8.9%), β-caryophyllene (8.8%), abieta-8,11,13-triene (7.1%), trans-(Z)-α-bergamotol (6.0%), cis-sabinene (5.5%) and spathulenol (5.3%). This is the first report on the chemical composition of essential oil of I. batatas growing in Nigeria.
Aims: The aim of the research is to investigate the volatile constituents from I. batatas collected in Ibadan, Oyo State, Nigeria
Study Design: Extraction of essential oil from the air-dried leaf samples of I. batatas and investigation of its chemical constituents.
Place and Duration of Study: Mature leaves of I. batatas were collected from a location in Ibadan, Oyo State, Nigeria, in May 2012.
Methodology: Air-dried and pulverized leaves were hydrodistilled in a Clevenger-type apparatus to obtained colourless volatile oil whose chemical constituents was analyzed by GC and GC/MS.
Results: A total of Forty-one compounds accounting 93.5% of the oil were identified from the GC/MS and the major constituents were found to be abietadiene (8.9%), β-caryophyllene (8.8%), abieta-8,11,13-triene (7.1%), trans-(Z)-α-bergamotol (6.0%), cis-sabinene (5.5%) and spathulenol (5.3%).
Conclusion: The present oil compositions were found to be different from the results previously reported from the essential oils of different cultivars grown in other parts of the world.
Keywords: Ipomoea batatas, convolvulaceae, essential oil composition, terpenes