Naude, YvetteVan Aardt, MarleenRohwer, Egmont Richard2011-03-042011-03-042009-04Naude, Y, Van Aardt, M & Rohwer, ER 2009, 'Multi-channel open tubular traps for headspace sampling, gas chromatographic fraction collection and olfactory assessment of milk volatiles', Journal of Chromatography A, vol. 1216, no. 14, pp. 2798-2804. [www.elsevier.com/locate/chroma]0021-96731873-3778 (online)10.1016/j.chroma.2008.09.065http://hdl.handle.net/2263/15967A headspace sampling method is described for concentrating milk volatiles onto a multi-channel open tubular silicone rubber trap (MCT) for thermal desorption into a GC-FID. Sections of the chromatographic profile, single peaks or combinations of compounds are recaptured with secondary MCTs during a subsequent run. The recaptured aroma is released in a controlled manner by heating the MCT in a portable heating device. An aroma release window of several minutes allows up to six people the opportunity to sniff each aroma fraction more than once. Olfactory results suggest that a synergistic combination of 2-heptanone and 2-nonanone could be responsible for a pungent cheese, sour milk-like aroma. MCTs containing single components or fractions can be desorbed into a GC–MS for compound identification.en© 2008 Elsevier B.V. All rights reserved.Capillary gas chromatographySorptive extraction and collectionHeadspace samplingAroma constituentsMilk volatilesPolydimethylsiloxaneOlfactometryGas chromatographyAromatic compoundsMilk -- Flavor and odorPostprint Article