352 5 Aroma Compounds
Fig. 5.9.Apparatus for the gas chromatography–olfactometry of static headspace samples. 1 Sample in ther-
mostated glass vessel, 2 septum, 3 gastight syringe, 4 injector, 5 hydrophobed glass tube, 6 carrier gas, e. g., he-
lium, 7 purge and trap system, 8 cold trap, 9 gas chromatograph with capillary column, 10 sniffing port, 11 flame
ionization detector (according toGuthandGrosch, 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 me-
thional, 9 2-acetyl-1-pyrroline, 10 dimethyltrisulfide (according toWagnerandGrosch, 1997)