The Verification of the Usefulness of Electronic Nose Based on Ultra-Fast Gas Chromatography and Four Different Chemometric Methods for Rapid Analysis of Spirit Beverages
Table 3
Compounds detected in vodka samples.
Name
RT1/LTPRI1
RT1/LTPRI2
LTPRI1 LIT
LTPRI2 LIT
Descriptor
(E)-2-Heptenal
50.41/950
53.00/1049
960
1062
Sulfurous, earthy, grossy, and almond
(E)-2-Octene
38.55/813
34.72/816
815
819
—
(Z)-2-Nonenal
64.94/1134
66.97/1251
1148
1254
Cucumber, geranium and green
1-Hexanol
42.59/875
45.73/991
870
980
Dry, floral, grossy, green, woody, and fruity
1-Octen-3-one
52.82/979
54.96/1075
979
1066
Herbaceous
2-Methyl-1-butanol
32.07/739
37.35/848
739
852
Winey, buttery, and malty
3-Methylbut-2-en-1-ol
35.22/775
38.53/863
778
863
Fruity and green
3-Methylfuran
22.07/614
37.44/849
614
856
—
Ethanol
14.91/426
18.55/575
437
564
Alcoholic
Ethyl acetate
21.00/600
24.68/682
609
673
Acidic, etheral, fruity, and orange
Ethyl butyrate
37.31/799
38.42/861
799
864
Fruity and acetone
Furfural
38.49/812
46.80/967
827
972
Almond and bread
Hexyl butyrate
69.28/1193
68.24/1271
1191
1257
Apple, fruity, and green
Limonene
58.06/1044
54.82/1074
1033
1061
Citrus, fruity, and minty
Methanol
14.63/418
16.67/516
419
507
—
Methylnonanedione
73.97/1261
75.92/1396
1253
1397
Fruity and straw
Propenal
15.24/435
18.11/561
450
566
—
Pyrazine
31.11/728
35.94/831
738
822
Corn and nutty
Tert-butylmethylether
19.31/551
19.24/596
546
600
—
Tetradecane
82.64/1393
75.83/1395
1400
1400
Alkane, sweet, and mildly herbaceous
Undecane
62.56/1101
56.14/1091
1100
1100
Alkane and fusel
RT1: retention time in column 1 (MXT-5); LTPRI1: linear temperature-programmed retention index for compounds from column 1; RT2: retention time in column 2 (MXT-1701); LTPRI2: linear temperature-programmed retention index for compounds from column 2; LTPRI1 LIT: linear temperature-programmed retention index for compounds from column 1 from literature; LTPRI2 LIT: linear temperature-programmed retention index for compounds from column 2 from literature. The positive identification of selected compounds was highlighted in bold font.
