## 3 Results
### Volatile Flavor Compounds Identified from the Braised Pork
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Compounds** & **ID X** & **RI Y** & **RI Z** & \multicolumn{2}{c}{**Peak Area (\%)**} \\ \cline{6-6}  & \multicolumn{4}{c}{Hydrocarbons} & & & **A** & **B** \\ \hline \multicolumn{6}{c}{Hydrocarbons} \\ \hline \(\alpha\)-Pinene & M & 1036 & 1032 m & 0.29 \(\pm\) 0.07 & 0.40 \(\pm\) 0.09 \\ \(\beta\)-Carphene & M & 1078 & 1075 m & 0.90 \(\pm\) 0.02 & 1.04 \(\pm\) 0.05 \\ \(\beta\)-Pinene & M & 1135 & 1116 m & 0.04 \(\pm\) 0.01 & 0.06 \(\pm\) 0.02 \\ \(\delta\)-Carene & M & 1169 & 1148 m & 0.04 \(\pm\) 0.01 & nd \\ \(\beta\)-Myrcne & M & 1171 & 1145 m & 0.12 \(\pm\) 0.03 & 0.09 \(\pm\) 0.04 \\ \(\alpha\)-Phellandrene & M & 1176 & 1166 m & nd & 0.05 \(\pm\) 0.02 \\ \(\text{Limonene}\) & M & 1204 & 1201 m & 0.32 \(\pm\) 0.11 & 0.22 \(\pm\) 0.08 \\ \(\beta\)-Bornylene & S & 1217 & & nd & 0.05 \(\pm\) 0.01 \\ \(\beta\)-Phellandrene & M & 1214 & 1209 m & 0.37 \(\pm\) 0.12 & 0.38 \(\pm\) 0.06 \\ \(\text{Styrene}\) & M & 1272 & 1241 m & 0.07 \(\pm\) 0.01 & 0.23 \(\pm\) 0.11 \\ \(\text{o-Cymene}\) & S & 1280 & & 0.04 \(\pm\) 0.01 & 0.06 \(\pm\) 0.02 \\ Total & & & & 2.19 & 2.59 \\ \hline \multicolumn{6}{c}{Aldehydes} \\ \hline \(2\)-Methylpropanal & M & 834 & 821 m & 0.09 \(\pm\) 0.01 & 0.07 \(\pm\) 0.01 \\ \(3\)-Methylbutanal & M & 935 & 910 m & nd & 0.80 \(\pm\) 0.21 \\ \(2\)-Methylbutanal & M & 933 & 912 m & 0.48 \(\pm\) 0.13 & nd \\ \(\text{Pentanal}\) & M & 942 & 935 m & 0.13 \(\pm\) 0.01 & 0.17 \(\pm\) 0.02 \\ Hexanal & M & 1076 & 1084 m & 0.25 \(\pm\) 0.02 & 0.63 \(\pm\) 0.14 \\ \(\text{Heptanal}\) & M & 1174 & 1174 m & 0.08 \(\pm\) 0.03 & 0.08 \(\pm\) 0.02 \\ \(\text{Octanal}\) & M & 1303 & 1280 m & 0.04 \(\pm\) 0.01 & 0.04 \(\pm\) 0.01 \\ \(\text{(E)-2-Heptenal}\) & M & 1344 & 1324 s & 0.11 \(\pm\) 0.04 & 0.05 \(\pm\) 0.01 \\ Nonanal & M & 1385 & 1385 m & 0.12 \(\pm\) 0.02 & 0.15 \(\pm\) 0.03 \\ Benzaldehyde & M & 1522 & 1495 m & 0.49 \(\pm\) 0.16 & 0.57 \(\pm\) 0.13 \\ \(\text{Phenylacetaldehyde}\) & M & 1639 & 1625 m & 0.06 \(\pm\) 0.02 & 0.08 \(\pm\) 0.01 \\ \(\text{(E,E)-2-4-Decadienal}\) & M & 1654 & 1632 m & 0.04 \(\pm\) 0.01 & 0.02 \(\pm\) 0.01 \\ \(\text{Geranial}\) & M & 1745 & 1715 m & 0.03 \(\pm\) 0.01 & 0.03 \(\pm\) 0.01 \\ \(\text{4-Methoxybenzaldehyde}\) & S & 2042 & & 0.04 \(\pm\) 0.01 & 0.03 \(\pm\) 0.01 \\ \(\text{(Z)-Cinnamaldehyde}\) & S & 2053 & & 0.68 \(\pm\) 0.13 & 0.28 \(\pm\) 0.04 \\ Total & & & & 2.64 & 3.00 \\ \hline \multicolumn{6}{c}{Alcohols} \\ \hline Ethanol & M & 959 & 929 m & 0.52 \(\pm\) 0.13 & 0.80 \(\pm\) 0.21 \\ Cyclopentanol & S & 1004 & & nd & 0.14 \(\pm\) 0.03 \\ \(\text{Allyl alcohol}\) & S & 1141 & & nd & 0.06 \(\pm\) 0.01 \\ \(\text{1-Butanol}\) & M & 1169 & 1145 m & 0.06 \(\pm\) 0.01 & nd \\ \(\text{3-Methyl-1-butanol}\) & M & 1228 & 1205 m & nd & 0.07 \(\pm\) 0.01 \\ \(\text{1-Pentanol}\) & M & 1234 & 1255 m & 0.08 \(\pm\) 0.02 & 0.10 \(\pm\) 0.04 \\ \(\text{1-Hexanol}\) & M & 1373 & 1360 m & nd & 0.03 \(\pm\) 0.01 \\ \(\text{1-Terpinen-4-ol}\) & M & 1589 & 1591 m & 0.02 \(\pm\) 0.01 & 0.03 \(\pm\) 0.01 \\ \(\text{2-(Ethoxyethoxylethanol}\) & S & 1650 & & 0.02 \(\pm\) 0.01 & 0.08 \(\pm\) 0.02 \\ \(\alpha\)-Terpineol & M & 1681 & 1688 m & 0.02 \(\pm\) 0.01 & 0.03 \(\pm\) 0.01 \\ \(4\text{-Hydroxy-4-methyl-2-pentanone}\) & S & 2350 & & nd & 0.07 \(\pm\) 0.03 \\ Total & & & & 0.72 & 1.40 \\ \hline \multicolumn{6}{c}{Ketones} \\ \hline \(2\)-Pentanone & M & 1002 & 983 m & 0.12 \(\pm\) 0.03 & nd \\ Acetoin & M & 1270 & 1287 m & 0.10 \(\pm\) 0.02 & 0.07 \(\pm\) 0.02 \\ \(6\)-Methyl-5-hepten-2-one & M & 1357 & 1336 m & 0.06 \(\pm\) 0.02 & nd \\ Total & & & & 0.28 & 0.07 \\ \hline \multicolumn{6}{c}{Acids} \\ \hline Acetic acid & M & 1445 & 1450 m & 0.30 \(\pm\) 0.12 & 0.20 \(\pm\) 0.09 \\ Propanoic acid & M & 1551 & 1523 m & 0.04 \(\pm\) 0.02 & nd \\ Butanoic acid & M & 1610 & 1619 m & 0.04 \(\pm\) 0.01 & 0.06 \(\pm\) 0.02 \\ Hexanoic acid & M & 1892 & 1888 s & 0.03 \(\pm\) 0.01 & 0.04 \(\pm\) 0.01 \\ Decanoic acid & M & 2333 & 2361 m & 0.15 \(\pm\) 0.07 & nd \\ Total & & & & 0.57 & 0.30 \\ \hline \hline \end{tabular}
\end{table}