TABLE 3.
Key odor-active compounds identified in cigar tobacco leaves (PY-GC-O-MS).
| Odor description | Compound | RT | RI | Odor threshold (μg/L) | Relative content (%) | OAV | VIP | Possible origin |
|---|---|---|---|---|---|---|---|---|
| Sweet, caramel, buttery, toasted/Nutty (almond-like), and toasty/Bready, with a slight sourness/Tang | 2-Propanone, 1-hydroxy- | 4.492 | 665 | ND | 3.499 | 0 | 1.185 | Maillard reaction |
| 2-Propanone, 1-(acetyloxy)- | 8.658 | 870 | ND | 0.989 | 0 | 1.332 | Maillard reaction | |
| 1,2-Cyclopentanedione, 3-methyl- | 13.683 | 1,043 | 0.026 | 0.502 | 10.318 | 0.523 | Maillard reaction | |
| Furaneol | 15.074 | 1,070 | 0.0015 | 0.128 | 41.517 | 0.373 | Maillard reaction | |
| Floral, black tea, herbal, fruity | Indole | 21.239 | 1,295 | 0.04 | 0.685 | 9.566 | 0.744 | Shikimate pathway |
| 7-Oxabicyclo [4.1.0]heptan-3-ol, 6-(3-hydroxy-1-butenyl)-1,5,5-trimethyl- | 29.854 | 1,674 | ND | 1.902 | 0 | 1.003 | Chlorophyll degradation | |
| Neophytadiene | 33.243 | 1837 | ND | 1.80 | 0 | 0.797 | Chlorophyll degradation | |
| Phytol | 38.377 | 2,114 | 0.64 | 0.823 | 0.705 | 1.228 | Chlorophyll degradation | |
| Sour, medicinal, amine-like odor | Acetic acid | 4.032 | 610 | 0.013 | 2.653 | 114.36 | 0.62 | Maillard reaction |
| Phenol | 12.707 | 980 | 0.021 | 2.113 | 54.987 | 0.923 | Lignin degradation | |
| Phenol, 2-methoxy- | 15.183 | 1,090 | 0.0015 | 0.174 | 61.97 | 0.555 | Lignin degradation | |
| Pyrrolidine, 1-(1-pentenyl)- | 19.423 | | ND | 0.530 | 0 | 1.072 | Maillard reaction | |
| Typical fatty, cucumber peel, and waxy notes | 2-Nonen-1-ol, (E)- | 15.551 | 1,176 | 0.209 | 1.120 | 2.985 | 1.123 | Lipoxygenase pathway |
| Smoky/Unknown flavor | 4-Pyridinol | 17.272 | 1,154 | ND | 2.448 | 0 | 1.417 | Hydroxylated pyridine derivatives |
| 3-Pyridinol | 17.433 | | ND | 1.937 | 0 | 1.358 | Hydroxylated pyridine derivatives | |
| Catechol | 19.176 | 1,205 | 8 | 1.217 | 0.076 | 1.853 | Pyrolysis products of lignin | |
| Pyridine, 2-(1-methyl-2-pyrrolidinyl)- | 21.92 | 1,354 | ND | 22.07 | | 3.091 | Tobacco alkaloids and their metabolites | |
| Pyridine, 3-(1-methyl-2-pyrrolidinyl)-, (S)- | 22.523 | 1,361 | 470 | 30.659 | 0.035 | 3.257 | Tobacco alkaloids and their metabolites | |
| Pyridine, 3-(3,4-dihydro-2h-pyrrol-5-yl)- | 24.309 | 1,427 | ND | 3.274 | 0 | 2.128 | Tobacco alkaloids and their metabolites | |
| 2H-1,2-oxazine, tetrahydro-2-methyl-6-(3-pyridinyl)-, (−)- | 25.523 | | ND | 0.344 | 0 | 1.007 | Tobacco alkaloids and their metabolites | |
| 1,2,3,6-Tetrahydro-2,3′-bipyridine | 26.52 | | ND | 0.275 | 0 | 1.120 | Tobacco alkaloids and their metabolites | |
| 2,3′-dipyridyl | 26.858 | 1,556 | ND | 2.133 | 0 | 1.129 | Tobacco alkaloids and their metabolites | |
| Cotinine | 30.824 | 1721 | ND | 1.211 | 0 | 1.284 | Tobacco alkaloids and their metabolites | |
| n-Hexadecanoic acid | 35.624 | 1968 | ND | 1.078 | 0 | 1.18 | Fatty acids | |
| | Thunbergol | 37.852 | 2073 | ND | 0.386 | 0 | 1.002 | Fatty acids |
| 4,8,13-Cyclotetradecatriene-1,3-diol, 1,5,9-trimethyl-12-(1-methylethyl)- | 37.878 | | ND | 0.447 | 0 | 1.009 | Degradation products of cembranoids | |
| Octadecanoic acid | 39.261 | 2,172 | ND | 0.291 | 0 | 0.694 | Degradation products of cembranoids |