Studies on essential oils, Part 33: chemical and insecticidal investigations on leaf oil of Coleus amboinicus Lour.
Article first published online: 7 JUN 2002
Copyright © 2002 John Wiley & Sons, Ltd.
Flavour and Fragrance Journal
Volume 17, Issue 6, pages 440–442, November/December 2002
How to Cite
Singh, G., Singh, O. P., Prasad, Y. R., de Lampasona, M. P. and Catalan, C. (2002), Studies on essential oils, Part 33: chemical and insecticidal investigations on leaf oil of Coleus amboinicus Lour. Flavour Fragr. J., 17: 440–442. doi: 10.1002/ffj.1123
- Issue published online: 7 JUN 2002
- Article first published online: 7 JUN 2002
- Manuscript Accepted: 12 FEB 2002
- Manuscript Revised: 11 FEB 2002
- Manuscript Received: 24 JUN 2001
- Ministry of Science and Technology, India.
- Coleus amboinicus;
- chemical composition;
- Odontotermes obesus;
- essential oil
Chemical investigations of the leaf essential oil of Coleus amboinicus by GC and GC–MS techniques indicated the presence of six components, accounting for 97% of the total oil. The major component was thymol (94.3%), followed by carvacrol (1.2%), 1,8-cineole (0.8%), p-cymene (0.3%), spathulenol (0.2%), terpinen-4-ol (0.2%) and an unidentified component (1.4%). The oil was insecticidal to white termites (Odontotermes obesus Rhamb.) with 100% mortality at a dose of 2.5 × 10−2 mg/cm3 for 5 h exposure. This oil was also more active than the synthetic insecticides, Thiodan and Primoban-20, against termites, although it was ineffective against Tribolium castaneum, a stored product pest. Copyright © 2002 John Wiley & Sons, Ltd.