Chemical Composition And Larvicidal Activity Of Essential Oil From Lippia javanica against Rhipicephalus appendiculatus larvae
Journal Title: IOSR Journal of Pharmacy and Biological Sciences (IOSR-JPBS) - Year 2017, Vol 12, Issue 6
Abstract
Animal ectoparasites particularly ticks contribute majorly to decreased productivity in the livestock industry globally, due to diseases they transmit. This study evaluated the larvicidal activity of essential oil of Lippiajavanicaleaves against larvae of Rhipicephalusappendiculatus. The oil was obtained by hydro-distillation of fresh leaves and oil components analysed using Gas Chromatography-Mass Spectrometry (GC-MS). Major components in the oil were monoterpenes as shown by the high percentage of Artemisia ketone (49.52%), mtert-Butylphenol (8.73%), Linalool (4.43%), beta-myrecene (3.13%), Targetone (2.85%) and Isopiperitenone (2.13%). Sesquiterpenes constituted only 6.06% of the total oil. Contact toxicity was used in the bioassay and mortality data obtained at 6, 12, 24 and 48 hrs. The data obtained during bioassay was then subjected to probit regression analysis to estimate concentration dependent mortality for LC50 and LC90 values in mg/ml. The LC50 in mg/ml were: 3.1(3.0-3.2), 3.1(3.0-3.2) 3.1 (3.0-3.2) 3.07(2.94-3.19) and LC90 were 3.9(3.7-4.2), 3.9(3.7-4.2), 3.9(3.7-4.2), 3.9(3.7-4.2) at 6, 12, 24 and 48 hrs respectively from the start of the experiment. The results of one way ANOVA showed there was no significant difference in activity of the oil against the larvae between 6, 12, 24 and 48 hrs in all the concentrations of the oil used with P>0.05.The findings showed that essential oil of L. javanicapossessed larvicidal properties and can be used to control tick larvae.
Authors and Affiliations
Caroline J. Kosgei, Josphat C. Matasyoh, Charles M. Mwendia
Keywords
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- DOI 10.9790/3008-1206064649
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