Table 2.
Volatile compounds of prickly pear juice tentatively identified and semi-quantified according to geographical origin.
| RT (min) | Volatile Compounds (μg/L) | KI a | Western Messinia (Avg ± SD) | Eastern Messinia (Avg ± SD) | Lakonia (Avg ± SD) | Method of Identification | MS Qualification (%) | Orthonasal Threshold (μg/L) b | Odour Note c |
|---|---|---|---|---|---|---|---|---|---|
| Alcohols | |||||||||
| 11.66 | 1-Pentanol | 702 | 192.54 ± 90.69 | 178.18 ± 54.94 | 314.94 ± 105.62 | MS | 90 | 0.0055-305 | Fermented, green |
| 15.27 | 3-Hexen-1-ol | 787 | 32.26 ± 15.86 | 41.02 ± 31.12 | 47.81 ± 21.01 | MS | 94 | na | Woody, green, leafy |
| 15.89 | 2-Hexen-1-ol | 802 | 2486.91 ± 593.02 | 2681.84 ± 1280.63 | 3022.18 ± 1101.85 | MS/KI | 91 | na | Green, fruity, leafy |
| 16.02 | 1-Hexanol | 804 | 2372.75 ± 1341.20 | 3885.41 ± 941.84 | 3429.98 ± 1149.45 | MS/KI | 90 | 500-2500 | Green, fruity |
| 16.86 | 3,5-Hexadien-1-ol | 823 | 120.61 ± 57.82 | 189.66 ± 53.18 | 180.42 ± 67.70 | MS/KI | 92 | na | |
| 24.79 | 1-Octanol | 999 | ni | ni | 55.27 ± 46.57 | MS/KI | 90 | 190 | Herbal, green, penetrating |
| 28.67 | 2,6 Nonadien-1-ol | 1090 | 318.22 ± 265.20 | 270.39 ± 222.85 | 797.17 ± 337.37 | MS/KI | 91 | na | Green, cucumber-like |
| 28.75 | 2-Nonen-1-ol | 1091 | 443.17 ± 240.80 | 564.97 ± 124.63 | 921.67 ± 240.39 | MS/KI | 92 | na | Fatty |
| Aldehydes | |||||||||
| 7.63 | 2-Butenal | 520 | ni | ni | 41.58 ± 19.44 | MS | 90 | na | Floral |
| 9.13 | Pentanal | 620 | ni | ni | 19.87 ± 18.71 | MS | 86 | na | Bready, fruity, berry-like |
| 13.17 | Hexanal | 737 | 431.69 ± 218.41 | 288.86 ± 241.71 | 692.64 ± 156.50 | MS | 96 | 9.18-10.50 | Green, grassy, floral |
| 15.51 | 2-Hexenal | 793 | 512.87 ± 263.34 | 627.65 ± 411.57 | 1129.38 ± 258.88 | MS | 96 | 24.2 | Soapy, fatty, green |
| 17.63 | Heptanal | 840 | 26.20 ± 17.26 | ni | 43.79 ± 46.45 | MS/KI | 90 | na | Fruity, oily-greasy |
| 18.14 | 2,4-Hexadienal | 851 | ni | ni | 27.72 ± 23.07 | MS/KI | 92 | na | Green, fruity, waxy |
| 20.11 | 2-Heptenal | 894 | 29.28 ± 28.21 | ni | 55.93 ± 22.71 | MS/KI | 97 | na | Green, fatty, oily, fruity |
| 24.48 | 2-Octenal | 992 | 64.02 ± 49.55 | ni | 181.08 ± 48.33 | MS/KI | 91 | na | Sweet, green, fatty, brothy |
| 26.34 | Nonanal | 1035 | 86.00 ± 35.76 | 96.35 ± 20.97 | 187.25 ± 58.03 | MS/KI | 91 | 2.53-5.00 | Soapy, floral |
| 28.37 | 2,6-Nonadienal | 1082 | 78.21 ± 70.68 | 80.75 ± 68.90 | 378.80 ± 152.75 | MS/KI | 90 | na | Cucumber-like, green |
| 34.37 | 2,4-Decadienal | 1243 | ni | ni | 54.09 ± 47.75 | MS/KI | 93 | 0.2 | Fatty, waxy, green |
| Hydrocarbons | |||||||||
| 6.95 | 2,4-Hexadiene | 473 | ni | ni | 12.66 ± 13.81 | MS | 90 | na | na |
| 21.52 | 1-Decene | 926 | ni | 75.67 ± 65.39 | ni | MS/KI | 95 | 6.45 | Pleasant |
| 21.89 | Decane | 934 | ni | 22.57 ± 20.78 | ni | MS/KI | 93 | na | na |
| 29.73 | 1-Dodecene | 1116 | ni | 64.01 ± 60.12 | ni | MS/KI | 95 | na | na |
| Terpenoids | |||||||||
| 23.56 | dl-Limonene | 971 | 23.07 ± 49.07 | 14.85 ± 9.83 | ni | MS/KI | 98 | 0.0018-0.31 | Lemon, citrus |
| Furan derivatives | |||||||||
| 21.58 | Furan, 2-pentyl- | 927 | 40.71 ± 35.39 | ni | 109.03 ± 81.45 | MS/KI | 91 | 10.06 | Strong |