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352 5 Aroma Compounds

Fig. 5.9. Apparatus for the gas chromatography–olfactometry of static headspace samples. 1 Sample in thermostated

glass vessel, 2 septum, 3 gastight syringe, 4 injector, 5 hydrophobed glass tube, 6 carrier gas, e. g., helium,

7 purge and trap system, 8 cold trap, 9 gas chromatograph with capillary column, 10 sniffing port, 11 flame

ionization detector (according to Guth and Grosch, 1993)

Fig. 5.10. FD chromatogram of static headspace samples of French fries. Ordinate: n, number of 1 + 1 dilutions.

Abscissa: retention index (RI) on the capillary SE-54. The following odorants were identified: 1 methanethiol,

2 methylpropanal, 3 2,3-butanedione, 4 3-methylbutanal, 5 2-methylbutanal, 6 2,3-pentanedione, 7 hexanal, 8 methional,

9 2-acetyl-1-pyrroline, 10 dimethyltrisulfide (according to Wagner and Grosch, 1997)

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