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- Title
Toxicity of Rhododendron anthopogonoides Essential Oil and Its Constituent Compounds towards Sitophilus zeamais.
- Authors
Kai Yang; Yu Xin Zhou; Cheng Fang Wang; Shu Shan Du; Zhi Wei Deng; Qi Zhi Liu; Zhi Long Liu
- Abstract
The screening of several Chinese medicinal plants for insecticidal principles showed that essential oil of Rhododendron anthopogonoides flowering aerial parts possessed significant toxicity against maize weevils, Sitophilus zeamais. A total of 37 components were identified in the essential oil and the main constituents of the essential oil were 4-phenyl-2-butanone (27.22%), nerolidol (8.08%), 1,4-cineole (7.85%), caryophyllene (7.63%) and γ-elemene (6.10%), followed by α-farnesene (4.40%) and spathulenol (4.19%). Repeated bioactivity-directed chromatographic separation on silica gel columns led us to isolate three compounds, namely 4-phenyl-2-butanone, 1,4-cineole, and nerolidol. 4-Phenyl-2-butanone shows pronounced contact toxicity against S. zeamais (LD50 = 6.98 μg/adult) and was more toxic than either 1,4-cineole or nerolidol (LD50 = 50.86 μg/adult and 29.30 μg/adult, respectively) against the maize weevils, while the crude essential oil had a LD50 value of 11.67 μg/adult. 4-Phenyl-2-butanone and 1,4-cineole also possessed strong fumigant toxicity against the adults of S. zeamais (LC50 = 3.80 mg/L and 21.43 mg/L) while the crude essential oil had a LC50 value of 9.66 mg/L.
- Subjects
CHINA; RHODODENDRONS; SITOPHILUS; ESSENTIAL oils; MEDICINAL plants; FUMIGANTS; CHROMATOGRAPHIC analysis
- Publication
Molecules, 2011, Vol 16, Issue 9, p7320
- ISSN
1420-3049
- Publication type
Article
- DOI
10.3390/molecules16097320