Guaiol--a naturally occurring insecticidal sesquiterpene

Area of Science:

• Natural Product Chemistry
• Agricultural Entomology
• Chemical Ecology

Background:

• Ferula ferulaeoides is a plant species with potential bioactive compounds.
• Insect pests pose significant threats to agriculture, necessitating novel control strategies.

Purpose of the Study:

• To identify and isolate bioactive compounds from Ferula ferulaeoides.
• To evaluate the insecticidal activity of isolated compounds against key agricultural pests.

Main Methods:

• Gas chromatography-mass spectrometry (GC-MS) for compound identification.
• Chromatographic separation and spectroscopic analysis (NMR, X-ray diffraction) for isolation and structure elucidation.
• Bioassays to determine insecticidal efficacy (contact, fumigation) and toxicity (LD50, LC50).

Main Results:

• Thirty-four compounds were identified in the dichloromethane fraction of Ferula ferulaeoides.
• Guaiol was isolated as the main component (37.0%) and its structure confirmed.
• Guaiol demonstrated significant aphid inhibition (70 mg/L).
• Effective contact activity against Mythimna separate (LD50 = 0.07 mg/larva) and Plutella xylostella (LD50 = 8.9 mg/larva).
• Fumigation activity against M. separata (LC50 = 3.5 µL/L) and Musca domestica (LC50 = 16.9 µL/L).

Conclusions:

• Guaiol is a potent insecticidal compound isolated from Ferula ferulaeoides.
• Guaiol exhibits broad-spectrum activity against various insect pests.
• The findings suggest guaiol as a potential natural insecticide for sustainable pest management.