Table 1.
Identification and concentrations of volatile components of melon juice.
| ID | Volatile components1 | CAS | Molecular formula | Control (μg/kg)2 | UHT (μg/kg)2 | HP2-1 (μg/kg)2 | HP2-2 (μg/kg)2 | HP4-1 (μg/kg)2 | HP4-2 (μg/kg)2 | HP6-1 (μg/kg)2 | HP6-2 (μg/kg)2 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Ester | |||||||||||
| 1 | Diisobutyl phthalate | 84-69-5 | C16H22O4 | – | – | – | – | – | 0.42 ± 0.02 | – | – |
| 2 | Butyl-octyl phthalate | 84-78-6 | C20H30O4 | 8.50 ± 2.12 | 0.43 ± 0.01 | – | – | – | – | ||
| 3 | 2-Methyl-1-butyl acetate | 624-41-9 | C7H14O2 | – | 0.84 ± 0.02 | 8.19 ± 0.12 | 9.76 ± 0.50 | 9.22 ± 0.32 | 7.08 ± 1.20 | 3.45 ± 0.24 | 3.11 ± 0.32 |
| 4 | Isoamyl acetate | 123-92-2 | C7H14O2 | – | – | – | – | – | 0.73 ± 0.11 | – | – |
| 5 | 2,2,4-Trimethyl-1,3-pentanediol diisobutyrate | 6846-50-0 | C16H30O4 | – | 0.95 ± 0.23 | – | – | – | – | – | – |
| 6 | 2,4-Pentanediol,2,4-diacetate | 7371-86-0 | C9H16O4 | – | 0.62 ± 0.12 | – | – | 0.75 ± 0.04 | – | – | – |
| 4 | 1-(Benzoyloxy)-2,5-pyrrolidinedione | 23405-15-4 | C11H9NO4 | – | 0.61 ± 0.11 | – | 2.31 ± 0.02 | 1.44 ±0.11 | – | – | – |
| 8 | 2-Methylacetic acid-2-alkenyl ester | 33425-30-8 | C5H10O·C2H4O2 | – | – | – | – | 0.52 ± 0.01 | 0.40 ± 0.03 | – | – |
| 9 | (Z)-3-Hexenyl acetate | 3681-71-8 | C8H14O2 | – | 1.97 ± 0.22 | – | – | – | – | 0.95 ± 0.01 | 0.88 ± 0.02 |
| 10 | 2-Ethylhexyl acetate | 103-09-3 | C10H20O2 | – | – | – | – | – | – | 0.66 ± 0.05 | |
| 11 | Phenethyl acetate | 103-45-7 | C10H12O2 | – | 1.13 ± 0.01 | – | – | – | – | – | – |
| 12 | Butyl acetate | 123-86-4 | C6H12O2 | 1.44 ± 0.25 | 0.29 ± 0.06 | 1.75 ± 0.25 | 2.40 ± 0.26 | 2.45 ± 0.18 | 2.47 ± 0.15 | 1.32 ± 0.13 | 1.25 ± 0.01 |
| 13 | (Z)-non-3-enyl ester acetic acid | 13049-88-2 | C11H20O2 | – | 0.32 ± 0.03 | – | – | – | – | – | – |
| 14 | Benzyl acetate | 140-11-4 | C9H10O2 | – | 31.09 ± 2.23 | – | – | 4.55 ± 0.54 | 3.71 ± 0.25 | 0.86 ± 0.11 | 1.08 ± 0.32 |
| 15 | 2,4-Dimethylbenzoate | 55000-43-6 | C18H20O2 | – | 1.82 ± 0.02 | – | – | – | – | – | – |
| 16 | Ethyl acetate | 141-78-6 | C4H8O2 | 21.06 ± 2.24 | 2.38 ± 0.21 | 18.68 ± 2.12 | 21.59 ± 2.42 | 22.98 ± 2.54 | 16.59 ± 2.01 | 10.59 ± 1.58 | 5.54 ± 1.01 |
| 17 | Isobutyl acetate | 110-19-0 | C6H12O2 | 8.14 ± 1.52 | 1.39 ± 0.23 | 9.17 ± 1.15 | 12.25 ± 1.65 | 10.90 ± 1.12 | 9.91 ± 1.14 | 5.33 ± 1.25 | 4.74 ± 0.52 |
| 18 | Isopulegol acetate | 57576-09-7 | C12H20O2 | – | – | – | – | – | 0.44 ± 0.02 | – | – |
| 19 | n-Propyl acetate | 109-60-4 | C5H10O2 | – | – | – | – | – | – | – | 0.54 ± 0.12 |
| 20 | Propanoic acid, 2-methyl-, 3-hydroxy-2,2,4-trimethylpentyl ester | 77-68-9 | C12H24O3 | – | 0.37 ± 0.03 | – | – | – | – | – | – |
| Alcohol | |||||||||||
| 1 | (Z)-6-nonen-1-ol | 35854-86-5 | C9H18O | – | 3.05 ± 0.52 | – | – | – | – | 0.91 ± 0.23 | – |
| 2 | 1-Hexanol | 111-27-3 | C6H14O | – | – | – | – | – | – | 0.36 ± 0.15 | – |
| 3 | 2-Ethylhexanol | 104-76-7 | C8H18O | 8.71 ± 2.23 | 2.61 ± 0.56 | 9.12 ± 2.52 | 13.55 ± 2.65 | 7.92 ± 1.25 | 8.30 ±1.34 | 4.38 ± 0.98 | 4.36 ± 1.25 |
| 4 | 1-Nonanol | 143-08-8 | C9H20O | 24.49 ± 3.65 | 9.67 ± 2.54 | 23.88 ± 5.65 | 25.14 ± 4.25 | 1.68 ± 0.35 | 1.73 ± 0.52 | 4.17 ± 0.87 | |
| 5 | 1-Octen-3-ol | 3391-86-4 | C8H16O | – | – | – | – | 0.41 ± 0.02 | 0.56 ± 0.08 | 0.25 ± 0.03 | 0.30 ± 0.01 |
| 6 | 2,2,4-Trimethyl-1,3-pentanediol diisobutyrate | 6846-50-0 | C16H30O4 | – | 0.95 ± 0.05 | – | – | – | – | – | – |
| 7 | 2-Ethylhex-2-enol | 50639-00-4 | C8H16O | – | – | – | – | – | 0.45 ± 0.02 | – | – |
| 8 | 2-Nonen-1-ol | 22104-79-6 | C9H18O | 2.31 ± 0.25 | – | 1.81 ± 0.12 | 2.52 ± 0.23 | – | – | – | – |
| 9 | (E,Z)-3,6-Nonadien-1-ol | 56805-23-3 | C9H16O | 32.84 ± 5.65 | 13.54 ± 2.56 | 32.60 ± 4.25 | 51.68 ± 5.89 | 16.26 ± 2.25 | 15.82 ± 1.12 | 7.22 ± 2.23 | 5.80 ± 1.13 |
| 10 | (E)-3-Hepten-1-ol | 2108-05-06 | C7H14O | – | – | – | 1.24 ± 0.23 | – | – | – | – |
| 11 | (Z)-3-Nonen-1-ol | 10340-23-5 | C9H18O | 127.55 ± 12.25 | 33.26 ± 8.23 | 120.96 ± 12.25 | 183.21 ± 16.25 | 46.21 ± 4.32 | 40.75 ± 6.25 | 15.02 ± 3.25 | 12.96 ± 3.52 |
| 12 | 1-Methyl-4-(1-methylethenyl)-Cyclohexanol | 138-87-4 | C10H18O | – | – | – | – | 0.43 ± 0.03 | – | – | – |
| 13 | 3,5-Dimethylcyclohexanol | 5441-52-1 | C8H16O | – | – | – | – | – | 0.37 ± 0.05 | – | – |
| 14 | 1,8-Oxido-p-menthane(Cineole) | 470-82-6 | C10H18O | – | 0.42 ± 0.04 | – | – | – | – | – | – |
| 15 | 2-Phenylethanol | 60-12-8 | C8H10O | – | 1.01 ± 0.12 | – | – | – | – | – | – |
| Aldehyde | |||||||||||
| 1 | 2,6,6-Trimethyl-1-Cyclohexene-1-acetaldehyde | 472-66-2 | C11H18O | – | 1.27 ± 0.23 | 1.67 ± 0.21 | 2.55 ± 0.25 | 2.74 ± 0.35 | 2.98 ± 0.36 | 1.46 ± 0.15 | 1.62 ± 0.14 |
| 2 | 2,6,6-Trimethyl-1-cyclohexene-1-carboxaldehyde (β-Cyclocitral) | 432-25-7 | C10H16O | – | 2.54 ± 0.53 | – | – | – | – | – | – |
| 3 | 2,4-Decadienal | 25152-84-5 | C10H16O | – | 0.39 ± 0.12 | – | – | 0.45 ± 0.08 | – | 0.25 ± 0.04 | 0.29 ± 0.02 |
| 4 | (E)-2-Heptenal | 18829-55-5 | C7H12O | – | – | 10.36 ± 3.59 | 18.69 ± 2.85 | – | – | – | – |
| 5 | (E)-2-Nonenal | 18829-56-6 | C9H16O | – | – | – | – | – | 13.01 ± 1.25 | 2.26 ± 0.25 | 1.64 ± 0.52 |
| 6 | (E)-6-Nonenal | 2277-20-5 | C9H16O | 11.70 ± 1.23 | – | – | – | – | – | – | – |
| 7 | (Z)-7-Tetradecenal | 65128-96-3 | C14H26O | – | 3.97 ± 0.23 | – | – | – | – | – | – |
| 8 | Phenylacetaldehyde | 122-78-1 | C8H8O | – | 2.76 ± 0.27 | 1.62 ± 0.12 | – | – | 1.00 ± 0.26 | – | 0.69 ± 0.02 |
| 9 | Decyl aldehyde | 112-31-2 | C10H20O | – | 0.52 ± 0.15 | – | – | – | 0.80 ± 0.02 | – | 1.05 ± 0.01 |
| 10 | Heptaldehyde | 111-71-7 | C7H14O | – | – | – | – | 1.43 ± 0.55 | 2.12 ± 0.25 | 1.12 ± 0.23 | 2.81 ± 0.01 |
| 11 | Hexanal | 66-25-1 | C6H12O | 0.94 ± 0.23 | – | – | – | – | – | – | – |
| 12 | Nonanal | 124-19-6 | C9H18O | 20.95 ± 2.56 | 4.26 ± 0.87 | 27.10 ± 2.25 | 42.18 ± 5.58 | 8.52 ± 1.23 | 7.21 ± 2.21 | 1.79 ± 0.05 | 2.19 ± 0.04 |
| 13 | Octanal | 124-13-0 | C8H16O | 60.85 ± 9.58 | – | 68.69 ± 14.22 | 96.87 ±13.13 | 76.81 ± 11.02 | 71.80 ± 5.89 | 0.79 ± 0.01 | 0.65 ± 0.01 |
| 14 | Acetal | 105-57-7 | C6H14O2 | 7.50 ± 2.13 | 2.76 ± 0.12 | 8.30 ± 1.23 | 10.59 ± 2.45 | 8.81 ± 1.23 | 9.76 ± 2.96 | 4.24 ± 0.12 | 3.33 ± 0.02 |
| Ketone | |||||||||||
| 1 | 2,6-Bis(1,1-dimethylethyl)-4-hydroxy-4-methyl-2,5-Cyclohexadien-1-one | 10396-80-2 | C15H24O2 | 6.65 ± 1.12 | – | – | 15.12 ± 2.23 | 12.53 ± 4.02 | 12.39 ± 1.23 | 5.44 ± 1.01 | 4.08 ± 0.25 |
| 2 | Octahydro-1,1,8a-trimethyl-(E)-2,6-Naphthalenedione | 57289-17-5 | - | – | 1.30 ± 0.05 | 0.76 ± 0.05 | 1.08 ± 0.54 | – | – | – | – |
| 3 | 4-(2,2,6-trimethyl-7-oxabicyclo[4.1.0]hept-1-yl)-3-Buten-2-one | 23267-57-4 | C13H20O2 | – | – | – | – | 0.43 ± 0.25 | 0.60 ± 0.02 | 0.29 ± 0.01 | 0.33 ± 0.02 |
| 4 | 4-Hydroxy-3-methylacetophenone | 876-02-8 | C9H10O2 | – | 0.32 ± 0.02 | – | – | – | – | – | – |
| 5 | 6,10-Dimethylundeca-5,9-dien-2-one | 3796-70-1 | C13H22O | – | 8.74 ± 1.12 | 6.48 ± 1.12 | 15.45 ± 2.89 | 45.62 ± 4.25 | 50.84 ± 2.02 | 25.81 ± 0.03 | 29.04 ± 1.25 |
| 6 | 6-Methyl-5-hepten-2-one | 110-93-0 | C8H14O | – | 0.75 ± 0.23 | – | – | 2.20 ± 0.01 | 2.68 ± 0.02 | 1.36 ± 0.24 | 1.54 ± 0.54 |
| 7 | 1,1,3-Trimethyl-3-cyclohexene-5-one | 78-59-1 | C9H14O | – | – | 0.63 ± 0.04 | – | – | – | – | – |
| 8 | (E)-4-(2,6,6-Trimethyl-1-cyclohexen-1-yl)-3-buten-2-one (β-Ionone) | 79-77-6 | C13H20O | 2.48 ± 1.02 | 2.83 ± 0.25 | 3.27 ± 0.42 | 4.12 ± 1.54 | 4.44 ± 1.12 | 3.71 ± 0.25 | 1.82 ± 0.56 | 2.08 ± 0.01 |
| All ester | 39.14 ±6.13 | 44.20 ±3.53 | 37.79 ±3.64 | 48.31 ±4.85 | 52.81 ±4.84 | 41.74 ±4.91 | 22.51 ±2.32 | 17.78 ±2.37 | |||
| All alcohol | 195.89 ±30.01 | 64.51 ±14.62 | 188.36 ±24.79 | 277.34 ±36.63 | 72.89 ±8.22 | 67.98 ±9.38 | 32.31 ±7.74 | 23.42 ±5.91 | |||
| All aldehyde | 101.94 ±13.73 | 18.45 ±2.52 | 117.72 ±21.62 | 170.87 ±24.26 | 98.76 ±14.46 | 108.66 ±13.30 | 11.90 ±0.85 | 14.25 ±0.79 | |||
| All ketone | 9.13 ±2.14 | 13.95 ±1.67 | 11.14 ±1.63 | 35.76 ±7.20 | 64.21 ±9.65 | 70.22 ±2.54 | 34.72 ±1.85 | 37.07 ±2.07 | |||
| Total | 346.09 ±52.01 | 141.11 ±22.34 | 355.01 ±51.68 | 532.27 ±72.94 | 288.67 ±37.17 | 288.59 ±30.13 | 101.44 ±12.76 | 92.51 ±11.14 | |||
1Volatile components detected by the GC-MS compared with the standard mass spectrum in the NIST 17 library.
2Each value is the mean of triplicate biological samples.
“–” is not detected.