## 3 Results
\begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline  & & \multicolumn{6}{c}{**Ageing Time (Days)**} \\ \hline
**Volatile Compound** & _m/z_ & **LRI** & **1** & **3** & **6** & **9** & **14** & **SEM** & _p-Value_ \\ \hline Heptane, 2,3-dimethyl- & 43 & 847 & 22.54 & 24.65 & 41.26 & 34.94 & 21.01 & 3.85 & 0.420 \\
4-Octane, (E)- & 55 & 849 & 28.12 & 24.91 & 29.19 & 16.53 & 16.58 & 1.99 & 0.117 \\ BicyclO22-2 octane & 67 & 869 & 36.40 & 60.50 & 33.97 & 33.08 & 45.22 & 5.69 & 0.462 \\ Octane, 2-methyl- & 57 & 903 & 18.58 & 15.90 & 23.08 & 20.92 & 17.12 & 1.49 & 0.557 \\ Heptane, 3-ethyl- & 57 & 910 & 176.78 & 200.08 & 340.87 & 261.61 & 158.73 & 32.69 & 0.428 \\ Nonane, 3,7-dimethyl- & 57 & 920 & 81.04 & 98.91 & 182.68 & 140.14 & 76.77 & 16.96 & 0.254 \\ Heptane, 2,2,4-trimethyl- & 57 & 926 & 189.83 & 199.64 & 346.37 & 245.98 & 514.68 & 33.16 & 0.431 \\ Heptane, 2-methyl-3-methylene- & 57 & 935 & 25.76 & 37.88 & 50.57 & 40.64 & 31.65 & 4.71 & 0.606 \\ Octane, 3,5-dimethyl- & 57 & 940 & 183.17 & 187.43 & 306.95 & 226.50 & 150.97 & 28.76 & 0.520 \\
3-Methyl-3-hexene & 83 & 1042 & 53.76 & 57.27 & 90.26 & 64.45 & 47.09 & 8.09 & 0.536 \\
2-Octene, 4-ethyl-, (E)- & 69 & 982 & 152.48 & 179.33 & 263.42 & 177.96 & 180.62 & 24.90 & 0.690 \\ Heptane, 3-ethyl-5-methylene- & 70 & 989 & 256.88 & 304.39 & 469.75 & 359.75 & 281.88 & 42.93 & 0.596 \\
3-Ethyl-3-methylpentane & 57 & 992 & 83.30 & 86.41 & 129.37 & 96.89 & 73.42 & 11.47 & 0.632 \\ Pentane, 3-3-dimethyl- & 43 & 999 & 21.65 & 25.03 & 35.32 & 28.03 & 27.20 & 2.06 & 0.360 \\ Undecane, 6,6-dimethyl- & 57 & 1010 & 113.94 & 106.05 & 168.03 & 113.08 & 93.69 & 16.06 & 0.674 \\ Nonane, 5-methylene- & 56 & 1015 & 124.18 & 125.96 & 184.13 & 138.12 & 119.34 & 16.99 & 0.780 \\
2-Nonene, 3-methyl-, (E)- & 70 & 1026 & 272.98 & 320.03 & 454.00 & 343.21 & 304.51 & 42.60 & 0.773 \\ Heptane, 2,2,4,6,6-pentamethyl- & 57 & 1027 & 2097.53 & 2047.35 & 2887.36 & 2376.41 & 2075.11 & 243.39 & 0.814 \\ Decane & 57 & 1000 & 469.70 & 457.81 & 617.97 & 465.74 & 448.75 & 57.99 & 0.898 \\ (Z)-4-Methyl-2-heene & 98 & 1060 & 139.74 & 137.23 & 178.97 & 150.10 & 125.24 & 15.12 & 0.861 \\
2,2,4,4-Tetranhydroclane & 57 & 1066 & 211.32 & 184.91 & 320.03 & 236.37 & 198.07 & 28.68 & 0.609 \\ Undecane, 5,5-dimethyl- & 57 & 1084 & 207.26 & 193.58 & 278.17 & 212.43 & 187.80 & 23.16 & 0.770 \\ Dodecanee, 2,6,10-trimethyl- & 57 & 1092 & 163.67 & 134.96 & 189.02 & 154.10 & 111.87 & 13.95 & 0.513 \\ Dodecanee, 4-methyl- & 43 & 1105 & 113.87 & 97.93 & 144.11 & 113.03 & 89.44 & 12.08 & 0.693 \\
2-Decene, 3-methyl-, (Z)- & 57 & 1110 & 82.78 & 79.19 & 103.54 & 75.12 & 76.97 & 9.20 & 0.889 \\ Undecane & 57 & 1100 & 1373.12 & 1104.57 & 1573.01 & 1321.27 & 116.49 & 127.76 & 0.774 \\
2-Undecene, 9-methyl-, (Z)- & 57 & 1137 & 302.41 & 303.61 & 428.77 & 345.53 & 301.68 & 36.10 & 0.794 \\
2-Acetyl-2-methyletrahydrofuran & 57 & 1147 & 35.28 & 34.23 & 44.74 & 34.45 & 38.20 & 3.39 & 0.872 \\
4,4-Dipropylheptane & 57 & 1161 & 14.31 & 16.74 & 20.38 & 14.75 & 15.59 & 1.02 & 0.388 \\ Pentane, 3,3-diethyl- & 57 & 1166 & 112.29 & 113.67 & 86.75 & 91.55 & 75.91 & 13.17 & 0.883 \\ Dodecanee, 2-methyl-6-propyl- & 57 & 1173 & 183.67 & 157.97 & 237.76 & 206.75 & 144.99 & 19.34 & 0.582 \\
2-Undecene, 3-methyl-, (E)- & 70 & 1181 & 57.00 & 57.19 & 75.93 & 64.50 & 54.04 & 6.32 & 0.843 \\ Dodecanee & 57 & 1200 & 639.62 & 545.87 & 778.83 & 693.49 & 546.25 & 60.26 & 0.677 \\ Pentadecane, 6-methyl- & 57 & 1223 & 54.10 & 51.31 & 69.59 & 60.52 & 48.79 & 5.45 & 0.784 \\ Decane, 2,3,6-trimethyl- & 57 & 1238 & 17.80 & 15.30 & 20.01 & 15.86 & 14.27 & 0.98 & 0.393 \\ Trideane & 71 & 1300 & 157.67 & 148.36 & 187.06 & 156.25 & 121.01 & 13.75 & 0.710 \\ Trideacane, 3-methyl- & 85 & 1304 & 16.57 & 19.63 & 21.41 & 17.97 & 13.53 & 1.21 & 0.311 \\ Tetadecane & 57 & 1400 & 23.85 & 25.28 & 19.53 & 17.16 & 14.76 & 1.77 & 0.271 \\ Total Linear Hydrocarbons & 10,311.94 & 9379.77 & 12983.62 & 10,142.36 The effect of aging time in Alcohols (12 VOCs), carboxylic acids (3 VOCs), nitrogen compound (five VOCs), and sulphur compound (2 VOCs) content of donkey meat steaks aged for 14 days under vacuum conditions are reported in Table 4. Ageing did not affect the alcohols production (\(p>0.05\)); differently, the total carboxylic acids and total nitrogen compounds were significantly affected by aging time (\(p<0.01\)) showing an increasing trend.