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Comparison of comprehensive two-dimensional gas chromatography-time-of-flight mass spectrometry and gas chromatography-mass spectrometry for the qualitative characterisation of roasted barley by solid-phase microextraction

✍ Scribed by Federica Bianchi; Maria Careri; Chiara Conti; Marilena Musci; Renè Vreuls

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
583 KB
Volume
30
Category
Article
ISSN
1615-9306

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✦ Synopsis

Abstract

Volatile compounds of roasted barley used in the production of barley coffee, the most common coffee substitute, were analysed by using solid‐phase microextraction (SPME) followed by GC‐MS and comprehensive GC×GC‐TOF‐MS, respectively. The optimised SPME extraction conditions in terms of selection of the fibre coating, extraction time and extraction temperature allowed to obtain the highest GC response, thus enhancing the identification capabilities of the developed method. As for the SPME‐GC×GC‐TOF‐MS analysis, 64 compounds with similarity, reverse and probability values above 800, 900 and 6000, respectively, were identified, by using a polar×apolar column set combination; in contrast, GC‐MS was able to identify a lower number of compounds, i. e. 40 volatiles.

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