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Studies on essential oils, Part 33: chemical and insecticidal investigations on leaf oil of Coleus amboinicus Lour.
Author(s) -
Singh Gurdip,
Singh Om Prakash,
Prasad Y. R.,
de Lampasona M. P.,
Catalan C.
Publication year - 2002
Publication title -
flavour and fragrance journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.393
H-Index - 70
eISSN - 1099-1026
pISSN - 0882-5734
DOI - 10.1002/ffj.1123
Subject(s) - coleus , carvacrol , thymol , essential oil , chemistry , pest analysis , botany , horticulture , traditional medicine , toxicology , food science , biology , medicine
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/cm 3 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.