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Related Experiment Videos

Insecticidal fatty acids and triglycerides from Dirca palustris.

R S Ramsewak1, M G Nair, S Murugesan

  • 1Bioactive Natural Products and Phytoceuticals, Department of Horticulture and National Food Safety and Toxicology Center, Michigan State University, East Lansing, Michigan 48824, USA.

Journal of Agricultural and Food Chemistry
|December 18, 2001
PubMed
Summary

Seed extracts from Dirca palustris yielded insecticidal compounds. Linoleic and oleic acids showed potent insecticidal and feeding deterrent activities against various pest larvae.

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Area of Science:

  • Phytochemistry
  • Chemical Ecology
  • Insect Toxicology

Background:

  • Dirca palustris, commonly known as eastern leatherwood, is a plant species with potential for novel bioactive compound discovery.
  • Natural products from plants are a rich source of insecticidal agents and feeding deterrents, crucial for sustainable pest management strategies.
  • Understanding the chemical constituents of Dirca palustris seeds can reveal compounds with significant agricultural or public health applications.

Purpose of the Study:

  • To isolate and identify chemical compounds from the seed hexane extract of Dirca palustris.
  • To evaluate the biological activity of the isolated compounds, specifically their insecticidal and feeding deterrent properties against key insect pests.

Main Methods:

  • Extraction of Dirca palustris seeds using hexane.

Related Experiment Videos

  • Isolation and purification of five compounds (1-5) using chromatographic techniques.
  • Identification of compounds through spectroscopic analysis.
  • Bioassays to determine insecticidal activity against Aedes aegyptii larvae and feeding deterrent activity against larvae of Helicoverpa zea, Lymantria dispar, Orgyia leucostigma, and Malacosoma disstria.

    • Main Results:

    • Five compounds were isolated: three triglycerides (1-3), linoleic acid (4), and oleic acid (5).
    • Triglycerides (1-3) exhibited no significant biological activity.
    • Linoleic acid (4) and oleic acid (5) demonstrated insecticidal effects on fourth instar Aedes aegyptii larvae.
    • Both linoleic acid and oleic acid displayed potent feeding deterrent activity against neonate larvae of Helicoverpa zea, Lymantria dispar, Orgyia leucostigma, and Malacosoma disstria.

    Conclusions:

    • Dirca palustris seeds contain linoleic acid and oleic acid, which possess significant insecticidal and feeding deterrent properties.
    • These fatty acids represent potential natural alternatives for pest control, particularly against Aedes aegyptii, Helicoverpa zea, Lymantria dispar, Orgyia leucostigma, and Malacosoma disstria.
    • Further research into the application of these compounds in integrated pest management programs is warranted.