## 3 Results and Discussion
### Analysis of Volatile Compounds  
#### 3.7.1 Volatile Compounds Content  
The volatile compound contents in the SM and BF of normal and spoiled Xuanwei ham are shown in Table 3. A total of 89 volatile compounds were detected, including 21 alcohols, 19 esters, 15 aldehydes, 9 acids, 7 ketones, 3 alkanes, 4 pyrazines, 4 aromatics, 3 terpenes and 4 other compounds. \begin{table}
\begin{tabular}{c c c c c c c} \hline \multicolumn{1}{c}{**Volatile Compounds**} & \multicolumn{2}{c}{**RI**} & \multicolumn{2}{c}{**Normal Ham**} & \multicolumn{2}{c}{**Spoiled Ham**} \\ \cline{3-6} \multicolumn{1}{c}{**Alcohols**} & \multicolumn{1}{c}{**} & \multicolumn{1}{c}{**BF**} & \multicolumn{1}{c}{**SM**} & \multicolumn{1}{c}{**BF**} & \multicolumn{1}{c}{**SM**} \\ \hline Alcohols & Methanediol & 672 & ND & ND & 12.85 \(\pm\) 1.01 * & 5.99 \(\pm\) 0.60 * \\
1 & Isopropyl alcohol & 928 & ND & 0.39 \(\pm\) 0.09 & ND & ND \\
3 & Ethanol & 934 & 105.84 \(\pm\) 350 * & 46.96 \(\pm\) 4.61 * & 106.28 \(\pm\) 257 * & 170 \(\pm\) 29.96 * \\
4 & 2-butanol & 100 & 3.35 \(\pm\) 3.39 & ND & ND & ND \\
5 & 3-Pentanol & 1117 & 0.51 \(\pm\) 0.13 * & ND & 2.28 \(\pm\) 0.8 * & 1.28 \(\pm\) 0.24 * \\
6 & 2-Pentanol & 1129 & 9.75 \(\pm\) 3.59 * & 1.53 \(\pm\) 0.20 * & 3.6 \(\pm\) 0.2 * & 2.48 \(\pm\) 0.48 * \\
7 & Butanol & 1151 & 8.94 \(\pm\) 2.02 * & 1.63 \(\pm\) 0.23 * & 2.24 \(\pm\) 0.54 * & 2.25 \(\pm\) 0.56 * \\
8 & 1,3-Pentanol & 1165 & 10.12 \(\pm\) 3.58 * & 4.53 \(\pm\) 0.50 * & 10.56 \(\pm\) 2.8 * & 6 \(\pm\) 1.64 * \\
9 & Isonym alcohol & 1212 & 6.13 \(\pm\) 1.88 * & 7.75 \(\pm\) 0.38 * & 4.97 \(\pm\) 2.44 * & 22.68 \(\pm\) 3.64 * \\
10 & 3-Methyl bienen & 1251 & ND & 1.63 \(\pm\) 0.39 & ND & ND \\
11 & Pentanol & 1255 & 99.00 \(\pm\) 30.43 * & 6.55 \(\pm\) 0.31 * & 47.28 \(\pm\) 12.22 * & 24.16 \(\pm\) 4.6 * \\
12 & 2-Ethyl bitanod & 1305 & 2.69 \(\pm\) 0.86 & ND & ND & ND \\
13 & Hexanol & 1356 & ND & ND & 123.76 \(\pm\) 11 * & 75.28 \(\pm\) 16.32 * \\
14 & 3-Octanol & 1456 & 31.83 \(\pm\) 3.12 * & 8.69 \(\pm\) 3.27 * & 36.4 \(\pm\) 4.88 * & 29.52 \(\pm\) 6.4 * \\
15 & Heptanod & 1460 & 6.50 \(\pm\) 2.93 * & 7.56 \(\pm\) 4.29 * & 7.16 \(\pm\) 14 * & 6.96 \(\pm\) 1.36 * \\
16 & Benzyl alcohol & 1508 & ND & ND & 17.0 \(\pm\) 0.52 & ND \\
17 & Octanol & 1564 & 7.07 \(\pm\) 1.58 * & 4.37 \(\pm\) 1.17 * & 20.52 \(\pm\) 33.2 * & 19.2 \(\pm\) 4.32 * \\
18 & 2,3-Butanedio & 1580 & 24.66 \(\pm\) 3.23 * & 45.42 \(\pm\) 3.65 * & 11.6 \(\pm\) 2.22 * & 9.96 \(\pm\) 2.28 * \\
19 & Trans-2-Octanol & 1620 & 9.29 \(\pm\) 3.70 * & ND & 3.48 \(\pm\) 0.44 * & 2.56 \(\pm\) 0.44 * \\
20 & 2-Phenylethanol & 1912 & ND & 0.79 \(\pm\) 0.31 * & 5.16 \(\pm\) 13.2 * & 4.44 \(\pm\) 1.2 * \\
21 & Dodecanol & 1999 & ND & ND & 1.88 \(\pm\) 0.72 * & 3.6 \(\pm\) 1.48 * \\  & Total & & 325.65 \(\pm\) 95.48 * & 137.82 \(\pm\) 18.98 * & 444.73 \(\pm\) 72.49 * & 386.27 \(\pm\) 75.12 * \\ Esters & Methyl propionate & 905 & ND & ND & 2.65 \(\pm\) 0.85 & ND \\
23 & Methyl isothibutyrate & 920 & ND & 1.18 \(\pm\) 0.23 & 3.60 \(\pm\) 0.93 & ND \\
24 & Ethyl propionate & 949 & 1.2 \(\pm\) 0.12 & ND & ND & ND \\
25 & Isobutyl acetate & 960 & 1.64 \(\pm\) 0.32 & ND & ND & 2 \(\pm\) 0.28 * \\
26 & Methyl butyrate & 983 & 1.44 \(\pm\) 0.16 * & 6.27 \(\pm\) 1.27 * & 14.67 \(\pm\) 3.35 * & 1.2 \(\pm\) 0.48 * \\  & Methyl 2-methyl & 1009 & 2.08 \(\pm\) 0.12 * & 2.76 \(\pm\) 0.59 * & 8.65 \(\pm\) 0.34 * & 3.48 \(\pm\) 0.56 * \\
28 & Methyl isovalerate & 1018 & 6.96 \(\pm\) 0.4 * & 4.59 \(\pm\) 0.96 * & 14.47 \(\pm\) 0.80 * & ND \\
29 & Ethyl butyrate & 1036 & ND & ND & 7.02 \(\pm\) 0.28 & ND \\ \hline \end{tabular}
\end{table} 
Table 3: Volatile compounds (ug/kg) of different muscles in normal and spoiled hams.