Liu XC, Liu Q, Chen XB, Zhou L, Liu ZL
Pest Management Science, 2014
In our screening program for new agrochemicals from wild plants, the essential oil of Tetradium glabrifolium (Champ. ex Benth.) T.G. Hartley fruits was found to possess strong larvicidal activity against the Asian tiger mosquito, Aedes albopictus L. The essential oil was extracted via hydrodistillation and their constituents were determined by GC-MS analysis. The active compounds were isolated and identified by bioassay-directed fractionation.
GC/MS analyses revealed the presence of 19 components with 2-tridecanone (43.38%), 2-undecanone (24.09%), d-limonene (13.01%), caryophyllene (5.04%) and β-elemene (4.07%) being the major constituents. Based bioactivity-directed chromatographic separation of the oil led to the isolation of 2-tridecanone, 2-undecanone and d-limonene as active compounds. The essential oil of T. glabrifolium exhibited larvicidal activity against the early fourth instar larvae of A. albopictus with an LC50 value of 8.20 µg/ml. The isolated constituent compounds, 2-tridecanone, 2-undecanone and d-limonene possessed strong larvicidal activity against the early fourth instar larvae of A. albopictus with LC50 values of 2.86 µg/ml, 9.95 µg/ml and 41.75 µg/ml, respectively.
The findings indicated that the essential oil of T. glabrifolium fruits and the three constituents have an excellent potential for use in control of A. albopictus larvae and could be useful in search of newer, safer and more effective natural compounds as larvicides.
Liu XC, Liu Q, Chen XB, et al. Larvicidal activity of the essential oil from Tetradium glabrifolium fruits and its constituents against Aedes albopictus. Pest Manag Sci. 2014. doi: 10.1002/ps.3964.