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J Chem Ecol

Title:		"A Technique for Thermal Desorption Analyses Suitable for Thermally-Labile, Volatile Compounds"
Author(s):		Alborn HT;
Address:		"Center for Medical Agricultural and Veterinary Entomology, Agricultural Research Service, US Department of Agriculture, Gainesville, FL, 32608, USA. hans.alborn@ars.usda.gov"
Journal Title:		J Chem Ecol
Year:		2018
Volume:		20180123
Issue:		2
Page Number:		103 - 110
DOI:		10.1007/s10886-018-0924-6
ISSN/ISBN:		1573-1561 (Electronic) 0098-0331 (Linking)
Abstract:		"Many plant and insect interactions are governed by odors released by the plants or insects and there exists a continual need for new or improved methods to collect and identify these odors. Our group has for some time studied below-ground, plant-produced volatile signals affecting nematode and insect behavior. The research requires repeated sampling of volatiles of intact plant/soil systems in the laboratory as well as the field with the help of probes to minimize unwanted effects on the systems we are studying. After evaluating solid adsorbent filters with solvent extraction or solid phase micro extraction fiber sample collection, we found dynamic sampling of small air volumes on Tenax TA filters followed by thermal desorption sample introduction to be the most suitable analytical technique for our applications. Here we present the development and evaluation of a low-cost and relatively simple thermal desorption technique where a cold trap cooled with liquid carbon dioxide is added as an integral part of a splitless injector. Temperature gradient-based focusing and low thermal mass minimizes aerosol formation and eliminates the need for flash heating, resulting in low sample degradation comparable to solvent-based on-column injections. Additionally, since the presence of the cold trap does not affect normal splitless injections, on-the-fly switching between splitless and thermal desorption modes can be used for external standard quantification"
Keywords:		Carbon Dioxide/chemistry Cold Temperature Equipment Design Filtration/economics/instrumentation/*methods Fruit/chemistry Gas Chromatography-Mass Spectrometry/economics/instrumentation/methods Musa/chemistry Plant Roots/chemistry Ruta/chemistry Solid Phase;
Notes:		"MedlineAlborn, Hans T eng 2018/01/24 J Chem Ecol. 2018 Feb; 44(2):103-110. doi: 10.1007/s10886-018-0924-6. Epub 2018 Jan 23"