Essential oils from the dried aerial parts of
Limnophila geoffrayi Bonati were obtained by water-distillation.
d-Pulegone (27.14%), perillaldehyde (19.13%) and
limonene (9.00%) were characterized as the major constituents
using gas chromatography-mass spectrometry
analysis. The antimicrobial activities of the essential oils and
their major components were evaluated against microorganisms
encountered normally in contaminated cosmetic
products, using the agar- and broth-dilution methods. Their
insecticidal activities against the Oriental fruit fly Bactrocera
dorsalis (Hendel) were tested using a bioassay with
impregnated filter paper. The results showed that the
essential oils possessed high antimicrobial activity, with
minimum inhibitory concentrations ranging from 0.03 to
0.2% per unit volume (v/v). Strong insecticidal activity as a
fumigant was also observed at an oil dose of 5 ll/disc, with a
94% mortality. Perillaldehyde was the most active com