Table 1.
Effect of aging time in aromatic hydrocarbons and aldehydes content, expressed as quantifier area units (AU × 103/g), of donkey meat steaks aged for 14 days under vacuum conditions (n = 10 samples for each aging time).
| Ageing Time (Days) | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Volatile Compound | m/z | LRI | 1 | 3 | 6 | 9 | 14 | SEM | p-Value |
| Furan, 3-methyl- | 82 | 582 | 34.46 | 27.11 | 19.04 | 29.47 | 21.23 | 2.20 | 0.219 |
| Benzene | 78 | 650 | 122.13 | 122.00 | 68.75 | 80.10 | 86.78 | 9.63 | 0.262 |
| Furan, 2,5-dihydro- | 41 | 670 | 35.15 | 25.35 | 16.94 | 22.09 | 21.62 | 2.11 | 0.118 |
| Furan, 2-ethyl- | 81 | 703 | 338.52 | 287.36 | 119.13 | 156.62 | 178.18 | 27.25 | 0.054 |
| Toluene | 92 | 804 | 121.07 | 80.29 | 116.04 | 141.66 | 119.53 | 9.82 | 0.329 |
| Ethylbenzene | 91 | 917 | 561.00 a | 222.73 b | 248.60 b | 231.58 b | 207.55 b | 37.81 | 0.019 |
| Benzene, 1,3-dimethyl- | 106 | 926 | 585.07 | 446.28 | 501.35 | 458.53 | 484.48 | 36.24 | 0.821 |
| 2-n-Butyl furan | 81 | 944 | 324.98 | 290.61 | 154.92 | 178.15 | 238.87 | 24.02 | 0.135 |
| p-Xylene | 106 | 958 | 221.17 a | 121.76 b | 128.72 a,b | 116.05 b | 120.83 b | 11.49 | 0.024 |
| 3-Carene | 136 | 983 | 109.63 | 89.09 | 126.93 | 109.03 | 102.17 | 8.58 | 0.718 |
| Furan, 2,3-dihydro-3-methyl- | 81 | 984 | 94.92 | 46.31 | 102.23 | 84.43 | 58.42 | 15.74 | 0.765 |
| Furan, 2-pentyl- | 81 | 1043 | 10,213.41 a | 8082.13 a,b | 3462.15 b | 5171.65 a,b | 5534.13 a,b | 730.69 | 0.032 |
| Total Aromatic Hydrocarbons | 12,375.25 a | 9838.03 a,b | 5064.81 b | 6779.35 a,b | 7173.80 a,b | 813.14 | 0.046 | ||
| Propanal | 58 | 526 | 580.18 | 809.05 | 596.61 | 651.52 | 870.97 | 50.04 | 0.258 |
| Propanal, 2-methyl- | 72 | 557 | 24.63 a,b | 15.96 a | 19.06 b | 34.31 b | 27.65 b | 1.95 | 0.010 |
| Butanal | 72 | 584 | 56.44 a,b | 60.67 a,b | 48.67 a | 52.48 a,b | 78.13 b | 3.31 | 0.042 |
| Butanal, 3-methyl- | 58 | 659 | 30.03 a | 34.61 a | 28.29 a | 79.21 b | 55.48 a,b | 5.62 | 0.011 |
| Butanal, 2-methyl- | 57 | 671 | 45.14 | 62.95 | 45.45 | 108.90 | 87.94 | 8.64 | 0.087 |
| Pentanal | 57 | 728 | 2402.89 | 2113.87 | 2207.51 | 2285.09 | 2858.49 | 1.89 | 0.335 |
| Hexanal | 56 | 865 | 34,161.17 | 33,955.98 | 36,215.04 | 35,474.08 | 38,958.15 | 3.31 | 0.732 |
| Furfural | 95 | 933 | 39.37 | 23.43 | 29.28 | 53.39 | 24.28 | 5.62 | 0.111 |
| 2-Hexenal, (E)- | 41 | 943 | 31.37 | 39.90 | 41.90 | 40.58 | 43.99 | 8.64 | 0.288 |
| Heptanal | 70 | 974 | 1012.65 | 1437.75 | 1090.78 | 1258.64 | 1436.41 | 122.08 | 0.303 |
| Benzaldehyde | 106 | 1045 | 248.02 a,b | 258.45 a,b | 221.45 a | 335.76 a,b | 481.34 b | 1231.03 | 0.031 |
| Octanal | 57 | 1086 | 352.34 | 513.19 | 408.50 | 413.44 | 511.60 | 4.18 | 0.506 |
| 5-Ethylcyclopent-1-enecarboxaldehyde | 124 | 1099 | 52.37 a,b | 59.46 a,b | 35.52 a | 48.00 a,b | 66.62 b | 1.76 | 0.025 |
| Benzeneacetaldehyde | 91 | 1119 | 29.02 a,b | 23.27 a | 38.55 a,b | 85.76 b | 58.54 a,b | 77.33 | 0.030 |
| 2-Octena(E)- | 70 | 1123 | 73.42 a | 69.16 a | 45.44 a,b | 38.01 b | 64.86 a,b | 29.67 | 0.005 |
| Nonanal | 57 | 1148 | 516.48 | 813.20 | 653.26 | 641.12 | 718.82 | 33.44 | 0.179 |
| Benzaldehyde, 3-ethyl- | 134 | 1209 | 24.25 a,b | 38.46 b | 17.66 a | 34.19 a,b | 25.62 a,b | 2.39 | 0.023 |
| 2,4-Decadienal | 81 | 1315 | 27.63 | 29.43 | 26.99 | 21.60 | 29.85 | 7.32 | 0.689 |
| Total Aldehydes | 40,132.94 | 40,321.95 | 41,764.45 | 41,637.05 | 46,387.71 | 3.85 | 0.687 | ||
Different letters in the same line show statistical differences (a,b: p < 0.01); SEM: standard error of mean; m/z: Quantifier ion; LRI: Lineal Retention Index calculated for DB-624 capillary column (J&W scientific: 30 m × 0.25 mm id, 1.4 µm film thickness) installed on a gas chromatograph equipped with a mass selective detector. LRI: linear retention index in agreement with literature for the same chromatographic column [25,34,43].