Title: Absolute quantification of headspace volatiles by PTR-MS
Authors : Pollien, Philippe
Lindinger, Christian
Ali, Santo
Yeretzian, Chahan
Proceedings: Contributions to the 1st International Conference on Proton Transfer Reaction Mass Spectrometry and its Applications
Pages : 153
Pages to: 156
Publisher / Ed. Institution : Innsbruck University Press
Publisher / Ed. Institution: Innsbruck
Issue Date: 2003
License (according to publishing contract) : Licence according to publishing contract
Type of review: Peer review (Publication)
Language : English
Subjects : Headspace; Flavor; PTR-MS
Subject (DDC) : 540: Chemistry
Abstract: One of the outstanding properties of PTR-fMlS is that it allows for a direct and absolute quantification of volatile organic compounds in the gas-phase. Here we examine this on a model sample of known concentration. The head space of an ethylbutyrate solution is stripped for 14 hours with a flow of 500 sccm/min, until the solution is completely depleted from ethylbutyrate. The measured PTR-MS count-rate is transformed into g/min of released ethylbutyrate. The cumulated amount turns out to be within a few percent of the initial 1000 microgram present in the solution. We then apply the method to in-mouth aroma release of ethylbutyrate to quantity breath-by-breath the quantity exhaled through the nose. Currently several experimental parameters that are not fully taken into consideration may affect a direct quantification (e.g transmission function of MS, humidity of sample gas). Work is underway to resolve these issues.
Departement: Life Sciences und Facility Management
Organisational Unit: Institute of Chemistry and Biotechnology (ICBT)
Publication type: Conference Paper
URI: http://www.ionicon.com/sites/default/files/uploads/doc/contributions_ptr_ms_Conference_1.pdf
Appears in Collections:Publikationen Life Sciences und Facility Management

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