Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1216, Issue 14, Pages 2798-2804Publisher
ELSEVIER
DOI: 10.1016/j.chroma.2008.09.065
Keywords
Capillary gas chromatography; Sorptive extraction and collection; Polydimethyl siloxane; Headspace sampling; Olfactometry; Aroma compounds; Milk volatiles
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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. (C) 2008 Elsevier B.V. All rights reserved.
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