## 3 Results and Discussion
### Key Aroma Compounds in Non-Smoked Bacon Identified via GC-O-Ms
\begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline \multirow{2}{*}{**No.**} & \multirow{2}{*}{**Threshold (ug/kg/kg)**} & \multirow{2}{*}{**Compounds**} & \multicolumn{4}{c}{**Concentration (ug/kg)**} & \multicolumn{2}{c}{**OAV**} \\ \cline{3-10}  & & & **XW** & **MN** & **ZZ** & **XW** & **MN** & **ZZ** \\ \hline \multicolumn{1}{c}{} & \multicolumn{4}{c}{Aldehydes} & & & & & \\ \hline
1 & 4 & Hexanal & \(868.55\pm 41.46\,\mathrm{b}\) & \(6288.88\pm 28.47\,\mathrm{a}\) & \(1123.21\pm 66.27\,\mathrm{c}\) & \(217.14\pm 10.37\,\mathrm{b}\) & \(157.22\pm 7.12\,\mathrm{a}\) & \(280.8\pm 16.57\,\mathrm{c}\) \\ \hline
2 & 0.7 & Octanal & \(65.21\pm 4.34\,\mathrm{a}\) & \(199.05\pm 4.81\,\mathrm{c}\) & \(79.25\pm 9.83\,\mathrm{b}\) & \(93.16\pm 6.2\,\mathrm{a}\) & \(284.36\pm 6.87\,\mathrm{c}\) & \(113.22\pm 14.04\,\mathrm{b}\) \\ \hline
3 & - & (Z)-2-heptral & \(217.17\pm 15.7\,\mathrm{a}\) & \(140.53\pm 3.4\,\mathrm{b}\) & \(146.91\pm 9.78\,\mathrm{b}\) & - & - & - \\ \hline
4 & 8 & Normal & \(218.24\pm 15.48\,\mathrm{b}\) & \(1253.94\pm 27.8\,\mathrm{c}\) & \(164.11\pm 11.92\,\mathrm{a}\) & \(27.28\pm 1.94\,\mathrm{b}\) & \(156.74\pm 3.47\,\mathrm{c}\) & \(20.51\pm 1.49\,\mathrm{a}\) \\ \hline
5 & 4 & (E)-2-octanal & \(44.47\pm 4.29\,\mathrm{a}\) & \(58.22\pm 2.9\,\mathrm{b}\) & \(50.64\pm 7.49\,\mathrm{b}\) & \(11.12\pm 1.07\,\mathrm{a}\) & \(14.55\pm 0.73\,\mathrm{b}\) & \(12.66\pm 1.87\,\mathrm{b}\) \\ \hline
6 & 3 & Decanal & \(17.94\pm 0.75\,\mathrm{a}\) & \(53.62\pm 4.52\,\mathrm{b}\) & - & \(5.98\pm 0.25\,\mathrm{a}\) & \(17.87\pm 1.51\,\mathrm{b}\) & - \\ \hline
7 & 0.25 & (E)-2-noreal & \(10.39\pm 0.56\,\mathrm{b}\) & \(5.66\pm 0.89\,\mathrm{a}\) & \(11.35\pm 1.6\,\mathrm{b}\) & \(41.55\pm 2.25\,\mathrm{b}\) & \(22.65\pm 3.55\,\mathrm{a}\) & \(45.38\pm 6.41\,\mathrm{b}\) \\ \hline
8 & 1 & (E)-2-4 & \(0.7\pm 0.2\,\) & - & - & \(0.7\pm 0.2\,\) & - & - \\ \hline
9 & 0.2 & (E)-2-4 & decanal & \(16.45\pm 0.93\,\mathrm{b}\) & \(18.84\pm 0.12\,\mathrm{c}\) & \(7.84\pm 0.99\,\mathrm{a}\) & \(82.25\pm 4.67\,\mathrm{b}\) & \(94.18\pm 0.62\,\mathrm{c}\) & \(39.2\pm 4.95\,\mathrm{a}\) \\ \hline
10 & 3 & Heptal & - & \(423.63\pm 11.32\,\mathrm{b}\) & \(146.91\pm 9.78\,\mathrm{a}\) & - & \(141.21\pm 3.77\,\mathrm{b}\) & \(48.97\pm 3.26\,\mathrm{a}\) \\ \hline
11 & 0.3 & (E)-2-decanal & - & \(23.48\pm 2.79\,\mathrm{a}\) & \(31.74\pm 2.63\,\mathrm{b}\) & - & \(78.26\pm 9.3\,\mathrm{a}\) & \(105.8\pm 8.77\,\mathrm{b}\) \\ \hline
12 & 1.4 & 2-Undoreal & - & \(7.86\pm 0.97\,\mathrm{a}\) & \(12.54\pm 1.19\,\mathrm{b}\) & - & \(5.61\pm 0.7\,\mathrm{a}\) & \(8.96\pm 0.85\,\mathrm{b}\) \\ \hline
13 & 0.04 & (E,Z)-2-4 & - & \(4.85\pm 0.45\,\) & - & - & \(121.28\pm 11.32\,\) & - \\ \hline  & & Total & \(1263.73\pm 14.86\,\mathrm{a}\) & \(2818.54\pm 53.99\,\mathrm{a}\) & \(1774.5\pm 42.45\,\mathrm{b}\) & \(576.14\pm 13.18\,\mathrm{a}\) & \(950.61\pm 22.68\,\mathrm{c}\) & \(675.51\pm 2.32\,\mathrm{b}\) \\ \hline  & & Alcohols & & & & & \\ \hline
14 & 150.2 & 1-Pentanol & \(88.36\pm 9.83\,\mathrm{c}\) & \(27.48\pm 3.58\,\mathrm{a}\) & \(53.34\,\mathrm{b}\) & \(5.9\pm 0.07\,\mathrm{c}\) & \(0.18\pm 0.02\,\mathrm{a}\) & \(0.36\pm 0.03\,\mathrm{b}\) \\ \hline
15 & 1 & 1-Octan-3-ol & \(129.7\pm 5.96\,\mathrm{c}\) & \(72.55\pm 1.98\,\mathrm{a}\) & \(101.94\pm 3.28\,\mathrm{b}\) & \(129.7\pm 5.96\,\mathrm{c}\) & \(72.55\pm 1.98\,\mathrm{a}\) & \(101.94\pm 3.28\,\mathrm{b}\) \\ \hline
16 & 25,482 & 2-Ethyl-1-hexanol & \(121.04\pm 19.38\,\mathrm{b}\) & - & - & - & - \\ \hline
17 & - & 2-3-Butanediol & \(223.45\pm 0.79\,\mathrm{b}\) & \(332.41\pm 2.89\,\mathrm{a}\) & \(149.1\pm 33.13\,\mathrm{a}\) & - & - & - \\ \hline
18 & 110 & 1-Octan- & \(16.89\pm 2.33\,\mathrm{a}\) & \(24.76\pm 2.14\,\mathrm{b}\) & \(29.74\pm 1.88\,\mathrm{a}\) & \(0.15\pm 0.02\,\mathrm{a}\) & \(0.23\pm 0.02\,\mathrm{v}\) & \(0.27\pm 0.02\,\mathrm{v}\) \\ \hline \hline \end{tabular}
\end{table} 
Table 3: The concentrations and OAVs of volatile compounds detected via GC-O-MS.  
\begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline \multirow{2}{*}{**No.