Table 2.
Volatile compounds identified through HS-GC-MS from noni juice, pineapple juice, and mixtures of the two juices (including Rotovap fractions).
| Pk # | Ret. time | LRI (HP5-MS) | Compound | Descriptors | Average Abundance (total ion current × 107) | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 100 P | 10 OGN | 10 RVN | 20 OGN | 20 RVN | OGN | RVN | Fraction | |||||
| 1 | 2.19 | 608 | 2-Methyl-3-buten-2-ol | Fruity | – | – | – | – | – | 5.2 ± 2.3a | – | 4.6 ± 0.1a |
| 2 | 2.20 | 610 | Ethyl acetate | Solvent-like, fruity | 35.1 ± 0.2a | 22.6 ± 0.1b | 25.1 ± 2.5b | 16.9 ± 0.2c | 15.3 ± 0.3c | – | – | – |
| 3 | 2.30 | 620 | Isobutanol | Wine, solvent, bitter | – | 0.3 ± 0.0b | – | 0.4 ± 0.0b | – | 1.7 ± 0.7ab | – | 1.9 ± 0.0a |
| 4 | 2.53 | 647 | Isopentanal | Gasoline-like | – | – | – | – | – | 0.2 ± 0.2a | – | – |
| 5 | 2.60 | 656 | 1-Butanol | Fruity | – | 1.1 ± 0.0b | – | 2.1 ± 0.1b | – | 10.1 ± 3.4a | – | 12.6 ± 0.3a |
| 6 | 2.86 | 686 | 2-Pentanone | Acetone like | – | 0.0 ± 0.0c | – | 0.1 ± 0.0c | – | 1.3 ± 0.0a | – | 0.2 ± 0.0b |
| 7 | 2.98 | 700 | Pentanal | Pungent, almond-like | – | – | – | – | – | 0.7 ± 0.0a | – | 0.1 ± 0.0b |
| 8 | 3.19 | 715 | 1-Propyl acetate | Mild, fruity | 0.7 ± 0.0a | 0.4 ± 0.0b | 0.4 ± 0.0b | 0.3 ± 0.0c | 0.2 ± 0.0c | – | – | – |
| 9 | 3.30 | 722 | Methyl butanoate | Fruity, sweet | 0.6 ± 0.0a | 0.4 ± 0.0b | 0.3 ± 0.0bc | 0.3 ± 0.0c | 0.2 ± 0.0d | – | – | – |
| 10 | 3.39 | 728 | 2-Methyl-1-buten-4-ol | Sweet, fruity | – | 1.7 ± 0.0b | – | 3.4 ± 0.1b | – | 16.2 ± 5.3a | – | 21.0 ± 0.5a |
| 11 | 3.50 | 736 | 2-Methyl-1-butanol | Ripe fruit | – | 0.3 ± 0.0d | – | 0.7 ± 0.0d | – | 5.8 ± 0.1a | – | 4.3 ± 0.1b |
| 12 | 3.83 | 759 | Ethyl isobutanoate | Sweet, fruity | 0.0 ± 0.0a | – | – | – | – | 0.3 ± 0.2a | – | – |
| 13 | 3.95 | 766 | 1-Pentanol | Pungent, alcohol-like | – | – | – | – | – | 0.1 ± 0.1a | – | 0.1 ± 0.0a |
| 14 | 4.06 | 774 | Isobutyl acetate | Fruit, apple, banana | 0.2 ± 0.0a | 0.1 ± 0.0b | 0.1 ± 0.0b | 0.1 ± 0.0c | 0.0 ± 0.0d | – | – | – |
| 15 | 4.07 | 775 | Prenol | Fruity | – | – | – | – | – | 0.1 ± 0.0a | – | 0.1 ± 0.0a |
| 16 | 4.11 | 778 | Methyl 2-methylbutanoate | Fruity, pineapple | 0.8 ± 0.0a | 0.4 ± 0.0bc | 0.4 ± 0.0b | 0.3 ± 0.0 cd | 0.2 ± 0.0d | – | – | – |
| 17 | 4.25 | 787 | Diethyl carbonate | Mild, fruity | 0.1 ± 0.0a | 0.0 ± 0.0b | 0.0 ± 0.0bc | 0.0 ± 0.0c | 0.0 ± 0.0d | – | – | – |
| 18 | 4.49 | 803 | Ethyl butanoate | Sweet, fruity | 0.8 ± 0.0b | 0.5 ± 0.0c | 0.4 ± 0.0d | 0.3 ± 0.0e | 0.2 ± 0.0f | 3.0 ± 0.0a | – | 0.3 ± 0.0ef |
| 19 | 4.72 | 816 | Butyl ethanoate | Fruity | – | – | – | – | – | 0.1 ± 0.0a | – | – |
| 20 | 5.03 | 834 | Furfural | Sweet, bread, almond | – | – | – | – | – | 0.1 ± 0.0a | – | 0.1 ± 0.0a |
| 21 | 5.33 | 852 | Ethyl 2-methylbutanoate | Fruity | 0.6 ± 0.0a | 0.3 ± 0.0b | 0.3 ± 0.0b | 0.2 ± 0.0c | 0.1 ± 0.0d | – | – | – |
| 22 | 5.33 | 852 | (E)-Hex-3-en-1-ol | Moss, fresh | – | – | – | – | – | 0.3 ± 0.1a | – | 0.2 ± 0.0a |
| 23 | 5.38 | 855 | (Z)-Hex-3-en-1-ol | Grass | – | – | – | – | – | 0.1 ± 0.1a | – | 0.1 ± 0.0a |
| 24 | 5.63 | 869 | 1-Hexanol | Green | – | 3.2 ± 0.0d | – | 6.0 ± 0.1c | – | 43.0 ± 0.3a | – | 39.4 ± 0.6b |
| 25 | 5.79 | 878 | Isoamyl acetate | Banana | 0.5 ± 0.0a | 0.4 ± 0.0b | 0.2 ± 0.0d | 0.3 ± 0.0c | 0.1 ± 0.0e | – | – | – |
| 26 | 5.93 | 887 | 3-Methyl-3-buten-1-ol, acetate | Fruity | – | – | – | – | – | 0.1 ± 0.1a | – | 0.1 ± 0.0a |
| 27 | 6.02 | 891 | 2-Heptanone | Soapy, fruity | – | 0.2 ± 0.0a | – | 0.3 ± 0.0a | – | 3.4 ± 1.5a | – | 2.0 ± 0.0a |
| 28 | 6.18 | 901 | 2-Heptanol | Sweet, floral, fruity | – | 0.1 ± 0.0c | – | 0.2 ± 0.0c | – | 2.3 ± 0.1a | – | 1.7 ± 0.1b |
| 29 | 6.21 | 903 | Ethyl pentanoate | Fruity | 0.0 ± 0.0a | – | – | – | – | – | – | – |
| 30 | 6.62 | 926 | Methyl hexanoate | Fruity, fresh, sweet | 0.9 ± 0.0a | 0.6 ± 0.0ab | 0.1 ± 0.1b | 0.4 ± 0.0ab | 0.2 ± 0.0b | 0.6 ± 0.3ab | – | 0.1 ± 0.0b |
| 31 | 7.59 | 982 | Hexanoic acid | Rancid, pungent, unpleasant | – | – | – | – | – | 5.7 ± 0.2b | – | 8.1 ± 0.6a |
| 32 | 7.90 | 1000 | Ethyl hexanoate | Fruity | 2.5 ± 0.0a | 1.8 ± 0.0ab | 0.4 ± 0.4d | 1.2 ± 0.0bc | 0.7 ± 0.1 cd | – | – | – |
| 33 | 8.07 | 1010 | (E)-Ethyl-3-hexenoate | Green, fruity | 0.0 ± 0.0a | – | – | – | – | – | – | – |
| 34 | 8.34 | 1027 | Methyl 3-methylthiopropanoate | Sulfurous, fruity | – | 0.0 ± 0.0b | – | 0.0 ± 0.0b | – | 0.1 ± 0.0a | – | – |
| 35 | 9.07 | 1072 | 1-Octanol | Sweet, floral, fruity | – | – | – | – | – | 0.2 ± 0.0a | – | 0.1 ± 0.1a |
| 36 | 9.56 | 1101 | Linalool | Flowery | – | – | – | – | – | 0.5 ± 0.0a | – | 0.4 ± 0.0b |
| 37 | 9.57 | 1102 | Ethyl 3-methylthiopropanoate | Pineapple-like | 0.0 ± 0.0c | 0.1 ± 0.0b | 0.0 ± 0.0c | 0.1 ± 0.0a | 0.0 ± 0.0c | – | – | – |
| 38 | 9.93 | 1126 | Methyl octanoate | Fruity | – | 0.0 ± 0.0a | – | 0.0 ± 0.0a | – | 0.1 ± 0.0a | – | – |
| 39 | 10.65 | 1172 | Octanoic acid | Sweaty | – | – | – | 0.0 ± 0.0c | – | 4.3 ± 0.3b | – | 6.5 ± 0.4a |
| 40 | 11.00 | 1196 | Ethyl octanoate | Fruity, fatty | – | 0.1 ± 0.0b | – | 0.1 ± 0.0b | – | 0.6 ± 0.0a | – | 0.5 ± 0.1a |
The letters indicate significant differences in volatiles between the juice samples (ANOVA, Tukey’s HSD, p < 0.05).