Influence of Adsorbent Nature on the Dynamic Headspace Study of Insect Semiochemicals

SERGIO A. RODRIGUEZ; MARÍA LAURA PALIZA; MONICA NAZARENO

AUSTRALIAN JOURNAL OF CHEMISTRY

CSIRO PUBLISHING

Lugar: Collingwood; Año: 2017 vol. 70 p. 902 - 907

0004-9425

In chemical ecology studies (insect?insect, insect?plant relationships), it is important to choose the appropriate samplingmethods and the correct optimization of sampling by using dynamic systems. In the present work, different adsorbentswere evaluated in a dynamic system that presents a stream of purified air flowing through an aeration chamber containing amixture of volatile organic compounds, mainly insect semiochemicals such as a-pinene, sulcatone, b-linalool, menthone,isomenthone, methyl salicylate, grandlure I, grandlure II, grandlure III, grandlure IV, eugenol, and a-ionone. Traditionaladsorbents such as Tenax TA, Porapak Q, Hayesep Q, and activated charcoal were evaluated; further, alternatives such asPorapak Rxn RP, HLB, SCX, and silica gel, among others were proposed owing to their lower cost. The resultsdemonstrated that Porapak Q and Porapak Rxn RP, despite their different chemical composition, were able to producesimilar ratios of compounds to that of the reference solution and, moreover, with the highest recovery yields. However, it isimportant to emphasize the adsorption selectivity provided by SCX for eugenol and a-ionone. When Porapak Rxn RP wasused in the analysis of Eucalyptus globulus volatiles, excellent results were obtained, and these agree with reported datafrom a hydrodistillation method.