PHYTOCHEMICAL PROFILE AND INSECTICIDAL ACTIVITY OF ESSENTIAL OIL FROM FRESH AND DRIED LEAVES OF NIGERIAN GROWN Citrus meyerii

Year 2016, Volume: 3 Issue: 2, 207 - 218, 12.07.2016

Lamidi Ajao Usman , Bolatito Eunice Olanipekun Ayorinde Victor Ogundele Kannike Abdurasak Musa

https://doi.org/10.18596/jotcsa.09331

Abstract

Leaves of Citrus meyerii harvested fresh and dried for four consecutive days were separately hydro-distilled and yielded 0.11 – 0.24 %(w/w) of essential oils. Characterisation of the oils using Gas chromatography - mass spectrometry (GC-MS) revealed the predominance of hydrocarbon monoterpenoids 51.1 – 68.3%. Oxygenated monoterpenoids, hydrocarbon sesquiterpenoids and oxygenated sesquiterpenoids constituted (17.4 - 24.9%), (12.2 - 19.8%) and (0.0 – 2.5%) of the oils respectively. Principal constituents of the oils were; 3-carene (10.1-30.7%), α-pinene (1.0%-18.7%), d-limonene (5.2-6.4%), cis-β-ocimene (5.8-14.2%), citronellal (5.4-6.8%), and β-elemene (3.0-5.8%). The oils were of 3-carene and α-pinene chemotypes. Oils that were of 3-carene chemotype were those from fresh and the leaves dried for one and four days while the oils from leaves dried for two and three days were of α-pinene chemotype.  Insecticidal activities of the oils were determined using contact toxicity test on Callosobruchus maculatus. Regardless of whether the leaves were fresh or dried, the oils were active against the insect. Interestingly, there was no significant difference in the activities of the oils against the insect.

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