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Contribution to the study of semiochemical slow release formulations. Development of flash chromatographic methods.

Authors
Publication Date
Keywords
  • Semiochemicals
  • Fast-Gc
  • Validation
  • Physical
  • Chemical
  • Mathematical & Earth Sciences :: Chemistry [G01]
  • Physique
  • Chimie
  • Mathématiques & Sciences De La Terre :: Chimie [G01]
Disciplines
  • Chemistry
  • Communication

Abstract

Diapositive 1 Contribution to the study of semiochemical slow release formulations. Development of flash chromatographic methods S. Heuskin1, J. Farmakidis1, S. Lorge2, M. Debatty-Mestdagh2, J.-P. Wathelet3, G. Lognay1 1 Department of Analytical Chemistry, FUSAGx, Passage des Déportés 2, B-5030 Gembloux, Belgique 2 Department of Interfaces Chemistry, UCL, Croix du Sud 1, B-1348 Louvain-la-Neuve, Belgique 3 Department of General and Organic Chemistry, FUSAGx, Passage des Déportés 2, B-5030 Gembloux, Belgique Essential oils and their constituents with semiochemical properties (communication signals between species) are more and more used for insect control in integrated pest management programs to encounter or drastically reduce the pesticides treatments. The main goals of the present study consist in isolating aphid semiochemical molecules from a plant source and formulating them to attract aphid predators and/or parasitoids on the infested fields. The essential oil of Matricaria chamomilla L. (Asteraceae) was reported to contain a high proportion of E-β-farnesene, the alarm pheromone of many aphids species. Another sesquiterpene (C15H24), β-Caryophyllene, identified as the aggregation pheromone of the Asian lady beetles Harmonia axyridis Pallas, is present as the major constituent in the essential oil of Nepeta cataria L. (Lamiaceae). Introduction Aphids tritrophic system E-β-farnesene Host plant (Vicia fabae L.) Phytophageous insects : aphids Predator : larva of Episyrphus balteatus De Geer Parasitoid : Aphidius ervi Haliday Alarm pheromone Aggregation phenomena of Harmonia axyridis Pallas β-caryophyllene Aggregation pheromone Larva of Harmonia axyridis Pallas Adult of Harmonia axyridis Pallas Aggregated colony Experimental Flash Chromatography fractionation Major compounds Composition Kovats indices 1 E-β-farnesene 42.6 % 1456 2 Germacrene D 2.9 % 1478 3 Bicyclogermacrene 2.0 % 1494 4 (E,E)-α-farnesene 8.3 % 1506

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