Table 1.
Volatile compounds identified in the fruits of five pumpkin samples.
| Volatiles | Retention Index (RI) |
Content (ng/g) |
||||||
|---|---|---|---|---|---|---|---|---|
| RI-practical | RI-NIST 14 Library a | RI-STD b | NO.44 | NO.45 | NO.301 | NO.326 | NO.335 | |
| Pyridine | 741 | 746 | 5.62 ± 0.62 | 7.40 ± 1.01 | 11.25 ± 0.82 | 12.65 ± 0.87 | 15.21 ± 3.80 | |
| (Z)-2-Penten-1-ol | 763 | 767 | 1.53 ± 0.29 | – | 2.11 ± 0.11 | 3.51 ± 0.33 | 2.65 ± 0.16 | |
| Toluene | 765 | 763 | 35.64 ± 3.33 | 20.49 ± 2.75 | 38.68 ± 9.79 | 31.46 ± 7.17 | 40.20 ± 27.88 | |
| Hexanal | 800 | 800 | 797 | 78.72 ± 6.85 | 7.09 ± 1.21 | 23.86 ± 0.46 | 11.55 ± 1.68 | 18.27 ± 1.11 |
| (E)-2-Hexenal | 852 | 854 | 852 | 103.17 ± 14.76 | 15.52 ± 3.75 | 75.85 ± 2.62 | 6.49 ± 1.18 | 81.08 ± 4.49 |
| 1-Hexanol | 865 | 868 | 864 | 58.47 ± 13.85 | 2.30 ± 0.36 | 11.00 ± 0.07 | 7.35 ± 0.77 | 11.18 ± 0.82 |
| 1,3-Dimethyl-benzene | 871 | 866 | 44.39 ± 8.02 | 25.14 ± 3.08 | 64.91 ± 8.12 | 44.03 ± 5.43 | – | |
| Nonane | 900 | 900 | 1.60 ± 0.38 | – | 2.61 ± 0.63 | 2.44 ± 0.12 | 6.68 ± 1.42 | |
| Heptanal | 901 | 901 | – | – | 2.29 ± 0.20 | 1.83 ± 0.42 | – | |
| Methional | 907 | 907 | 2.58 ± 1.12 | 6.50 ± 1.46 | 3.59 ± 0.17 | 2.93 ± 0.44 | 43.24 ± 4.35 | |
| 2-Acetyl-1-pyrroline | 921 | 922 | 920 | 46.44 ± 4.04 | – | – | – | – |
| 1-Methylethyl-benzene | 926 | 921 | 1.69 ± 0.41 | 1.06 ± 0.15 | 2.84 ± 0.28 | 2.91 ± 0.61 | 6.56 ± 1.44 | |
| Propyl-benzene | 956 | 953 | 8.03 ± 0.85 | 5.28 ± 0.98 | 13.16 ± 2.52 | 13.34 ± 3.02 | 27.96 ± 6.88 | |
| 4-Methyl-nonane | 961 | 961 | – | 0.66 ± 0.15 | 1.42 ± 0.26 | 1.07 ± 0.16 | 3.28 ± 0.63 | |
| Benzaldehyde | 965 | 962 | 966 | 77.60 ± 14.20 | 100.40 ± 22.48 | 117.53 ± 11.29 | 80.42 ± 13.48 | 136.38 ± 16.23 |
| 1-Octen-3-ol | 979 | 980 | 983 | 16.09 ± 3.58 | 13.78 ± 2.00 | 14.45 ± 0.56 | 8.71 ± 0.75 | 59.83 ± 2.17 |
| 6-Methyl-5-hepten-2-one | 983 | 986 | 4.66 ± 0.80 | 3.08 ± 0.69 | 4.78 ± 0.03 | 3.09 ± 0.12 | 6.42 ± 0.87 | |
| β-Myrcene | 990 | 991 | 985 | 1.47 ± 0.13 | – | – | – | – |
| 1,2,4-Trimethyl-benzene | 997 | 990 | 65.90 ± 14.47 | 56.53 ± 13.22 | 147.39 ± 17.75 | 150.64 ± 20.54 | 280.57 ± 33.77 | |
| Decane | 1000 | 1000 | 2.96 ± 0.55 | 2.07 ± 0.51 | 5.17 ± 0.90 | 6.30 ± 1.05 | 14.05 ± 0.31 | |
| Octanal | 1003 | 1003 | 1007 | 0.71 ± 0.05 | 0.80 ± 0.06 | 7.71 ± 0.24 | 2.30 ± 0.26 | 4.80 ± 0.22 |
| (E, E)-2,4-Heptadienal | 1010 | 1012 | 1014 | 1.39 ± 0.16 | 0.75 ± 0.01 | 4.18 ± 0.21 | 1.78 ± 0.13 | 3.77 ± 0.26 |
| Benzyl alcohol | 1036 | 1036 | 1041 | 87.34 ± 12.60 | 107.38 ± 2.63 | 119.46 ± 23.28 | 55.62 ± 5.50 | 120.44 ± 10.01 |
| 3,5,5-Trimethyl-3-cyclohexen-1-one | 1044 | 1044 | 2.30 ± 0.57 | 0.41 ± 0.10 | 1.17 ± 0.02 | – | 1.32 ± 0.13 | |
| Benzeneacetaldehyde | 1047 | 1045 | 1048 | 7.78 ± 1.03 | 28.03 ± 6.43 | 15.57 ± 0.87 | 10.75 ± 1.20 | 161.43 ± 14.51 |
| 1,4-Diethyl-benzene | 1050 | 1041 | 3.21 ± 0.73 | 3.22 ± 0.49 | 7.95 ± 1.67 | 8.65 ± 1.07 | 17.90 ± 1.64 | |
| 1-(1H-pyrrol-2-yl)-ethanone | 1059 | 1064 | 2.44 ± 0.18 | – | – | – | – | |
| 2-Methyl-decane | 1065 | 1064 | – | – | 1.68 ± 0.08 | 1.82 ± 0.26 | 4.74 ± 1.14 | |
| 2-Pyrrolidinone | 1067 | 1076 | 4.99 ± 1.02 | – | – | – | – | |
| p-Aminotoluene | 1068 | 1072 | – | – | 21.06 ± 3.08 | 11.30 ± 1.94 | 16.31 ± 3.40 | |
| (E,E)-3,5-Octadien-2-one | 1069 | 1073 | 10.68 ± 1.96 | 5.35 ± 0.33 | 10.76 ± 0.28 | 8.61 ± 0.40 | 15.20 ± 1.04 | |
| 1-Ethyl-2,4-dimethyl-benzene | 1081 | 1075 | 1.91 ± 0.07 | 2.46 ± 0.25 | 12.55 ± 2.99 | 13.89 ± 0.96 | 29.30 ± 5.75 | |
| Undecane | 1100 | 1100 | 23.85 ± 4.71 | 17.39 ± 2.52 | 23.93 ± 0.62 | 23.47 ± 2.25 | 32.50 ± 1.06 | |
| Nonanal | 1105 | 1104 | 1100 | 7.70 ± 0.15 | 8.38 ± 0.04 | 48.38 ± 1.80 | 18.41 ± 1.81 | 45.84 ± 0.41 |
| 2,6,6-Trimethyl-2-cyclohexene-1,4-dione | 1145 | 1144 | 1152 | 2.39 ± 0.36 | 2.04 ± 0.10 | – | 2.63 ± 0.28 | 2.06 ± 0.02 |
| (E, Z)-2,6-Nonadienal | 1152 | 1155 | 1162 | 8.70 ± 1.86 | – | 47.23 ± 2.52 | – | 5.80 ± 0.46 |
| (E,Z)-3,6-Nonadien-1-ol | 1156 | 1156 | 9.12 ± 0.51 | 12.29 ± 2.73 | 155.66 ± 10.16 | 20.65 ± 2.14 | – | |
| Acetic acid, phenylmethyl ester | 1164 | 1164 | – | 0.89 ± 0.06 | – | 1.42 ± 0.12 | – | |
| Octanoic acid, ethyl ester | 1194 | 1196 | 4.06 ± 0.59 | 4.33 ± 0.88 | 6.88 ± 0.56 | 10.80 ± 1.11 | – | |
| Decanal | 1207 | 1206 | 1204 | 3.09 ± 0.18 | 4.21 ± 0.92 | 11.34 ± 0.27 | 4.56 ± 0.54 | 8.72 ± 0.80 |
| 2,6,6-Trimethyl-1-cyclohexene-1-acetaldehyde | 1263 | 1254 | – | – | 1.99 ± 0.13 | – | 0.84 ± 0.03 | |
| 3-Ethyl-undecane | 1265 | 1260 | 0.93 ± 0.06 | 0.85 ± 0.07 | 1.55 ± 0.38 | 1.43 ± 0.23 | – | |
| α-Ethylidene-benzeneacetaldehyde | 1273 | 1279 | – | – | – | 2.07 ± 0.26 | 30.40 ± 4.43 | |
| 5-Methyl-tridecane | 1353 | 1348 | 3.83 ± 0.11 | 5.46 ± 1.12 | 8.70 ± 0.64 | 4.73 ± 0.07 | 4.43 ± 0.81 | |
| 3-Methyl-tridecane | 1371 | 1371 | 36.62 ± 3.22 | 37.24 ± 3.69 | 44.42 ± 2.53 | 39.94 ± 1.38 | 37.28 ± 4.45 | |
| α-Ionone | 1428 | 1426 | 1428 | 2.33 ± 0.01 | – | 14.85 ± 1.55 | 3.56 ± 0.45 | – |
| (E)-6,10-Dimethyl-5,9-undecadien-2-one | 1449 | 1453 | 1.55 ± 0.25 | 2.59 ± 0.53 | 11.88 ± 0.97 | 3.02 ± 0.47 | 4.60 ± 0.56 | |
| β-Ionone | 1485 | 1486 | 1486 | 3.78 ± 0.01 | 1.94 ± 0.01 | 12.50 ± 1.61 | 6.51 ± 0.98 | 7.22 ± 0.77 |
| 4-Ethyl-tetradecane | 1545 | 1548 | 1.75 ± 0.28 | 4.43 ± 0.89 | 4.63 ± 0.31 | 3.33 ± 0.26 | 4.01 ± 0.52 | |
| 3-Methyl-pentadecane | 1571 | 1570 | 9.02 ± 0.57 | 16.07 ± 2.43 | 19.19 ± 1.09 | 14.28 ± 1.07 | 15.93 ± 1.64 | |
| 3-Methyl-heptadecane | 1772 | 1770 | – | 1.59 ± 0.27 | 2.84 ± 0.10 | 1.37 ± 0.31 | 1.37 ± 0.05 | |
| 6,10,14-Trimethyl-2-pentadecanone | 1842 | 1844 | – | 0.62 ± 0.02 | 1.37 ± 0.25 | – | – | |
| Linoleic acid ethyl ester | 2159 | 2162 | – | – | – | 4.34 ± 0.10 | – | |
aRI-NIST 14 Library: the published retention index of compounds in NIST 14 library.
bRI-STD: retention index of standard substance analyzed on the same column was calculated using the homologous series of n-alkanes.
“–” Compounds were not detected in samples; or not fitted the filtrated parameters.