Multi-channel open tubular traps for headspace sampling, gas chromatographic fraction collection and olfactory assessment of milk volatiles

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Authors

Naude, Yvette
Van Aardt, Marleen
Rohwer, Egmont Richard

Journal Title

Journal ISSN

Volume Title

Publisher

Elsevier

Abstract

A 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.

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Keywords

Capillary gas chromatography, Sorptive extraction and collection, Headspace sampling, Aroma constituents, Milk volatiles

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Citation

Naude, 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]