## 3 Results and Discussion
### GC-MS Assay of Specimens before and after Fermentation
#### 3.4.3 Volatile Flavor Substances of the Four Groups of Fermented Specimens
\begin{table}
\begin{tabular}{r r r r r r} \hline \hline \multicolumn{1}{c}{**Serial**} & \multicolumn{1}{c}{**Retention**} & \multicolumn{4}{c}{**Relative Content (\%)**} \\ \multicolumn{1}{c}{**Number**} & \multicolumn{1}{c}{**Time/Min**} & \multicolumn{1}{c}{**Odor Substances**} & \multicolumn{1}{c}{**CP-12 h**} & \multicolumn{1}{c}{**CPB-12 h**} & \multicolumn{1}{c}{**CPY-12 h**} & \multicolumn{1}{c}{**CPBY-12 h**} \\ \hline
7 & 25.16 & tridecane & ND & ND & 3.21\% & 3.56\% \\
8 & 29.68 & tetradecane & ND & ND & ND & 1.50\% \\
9 & 28.41 & 3-methyl-tridecane & ND & ND & ND & 1.69\% \\
10 & 27.10 & 4-cyclohexyl-tridecane & ND & ND & ND & 0.48\% \\
11 & 36.54 & 3-methyl-pentadecane & ND & ND & ND & 1.00\% \\
12 & 28.16 & 10-methyl-eicosane & ND & ND & ND & 0.78\% \\
13 & 35.48 & 4-cyclohexyl-decane & ND & ND & ND & 0.91\% \\
14 & 6.09 & propyl-cyclopropane & ND & 3.51\% & ND & ND \\
15 & 34.01 & 2,6,10,15-tetramethyl- heptadecane & ND & ND & ND & 1.73\% \\  & & **Alcohol** & **24.23\%** & **16.19\%** & **16.87\%** & **17.97\%** \\
1 & 7.29 & hexyl alcohol & 12.82\% & 5.67\% & 9.30\% & 9.23\% \\
2 & 6.95 & (Z)-3-hexen-1-ol & 1.56\% & ND & ND & ND \\
3 & 10.56 & 1-octen-3-ol & 3.42\% & 2.93\% & 3.17\% & 2.45\% \\
4 & 30.52 & 2-hexyl-decanol & ND & ND & ND & 0.52\% \\
5 & 39.61 & 1-hexadecanol & ND & ND & ND & 0.46\% \\
6 & 13.05 & 1-octanol & 2.13\% & ND & ND & ND \\
7 & 15.28 & 1-nonanol & 3.09\% & ND & ND & ND \\
8 & 19.90 & nerolidol & 1.21\% & 1.08\% & ND & ND \\
9 & 14.61 & (Z)-2-Octen-1-ol & ND & 6.51\% & 4.40\% & 5.31\% \\
**Aldehydes** & **30.83\%** & **22.68\%** & **25.73\%** & **18.61\%** \\
1 & 5.36 & hexanal & 7.29\% & ND & 4.58\% & ND \\
2 & 8.32 & heptanal & 4.78\% & ND & ND & ND \\
3 & 12.70 & (E)-2-ocretal & 2.54\% & 5.40\% & 4.35\% & 5.06\% \\
4 & 10.13 & benzaldehyde & 3.02\% & 2.65\% & 2.23\% & 1.90\% \\
5 & 13.85 & nonanal & 5.60\% & 6.68\% & 5.86\% & 6.26\% \\
6 & 16.02 & capraldehyde & 4.51\% & 4.60\% & 5.91\% & 5.39\% \\
7 & 21.89 & myristic aldehyde & 3.09\% & 3.35\% & 2.80\% & ND \\
**Ketone** & **10.24\%** & **21.65\%** & **15.84\%** & **17.81\%** \\
1 & 18.71 & dihydro-5-pentyl-2(3H)-furanone & ND & 3.85\% & ND & ND \\
2 & 31.56 & 2,2,7-trimethyl-octa-5,6-dien-3-one & ND & ND & ND & 4.08\% \\
3 & 11.82 & 2(1H)-5-chloro-4,6-diphenyl- & ND & ND & 2.59\% & ND \\
4 & 10.90 & 2,3-butananedione & 5.36\% & 5.66\% & 5.58\% & 5.71\% \\
5 & 14.06 & 2,3-pentanedione & 4.88\% & 5.81\% & 5.19\% & 5.39\% \\
6 & 25.82 & 3-hydroxy-2-butanone & ND & 1.73\% & 2.48\% & 2.63\% \\
7 & 4.51 & 2-hydroxy-3-pentanone & ND & 4.60\% & ND & ND \\
**Acids** & **15.52\%** & **11.42\%** & **12.50\%** & **10.39\%** \\
1 & 30.51 & acetic acid & 8.17\% & 8.59\% & 5.62\% & 5.96\% \\
2 & 37.13 & caproic acid & 4.16\% & 2.83\% & 2.02\% & 1.78\% \\
3 & 30.18 & 2-ethylhexylester-2-pentanoic acid & ND & ND & 4.86\% & 0.89\% \\
4 & 11.96 & 2-2-hexyl-cyclopropaneacetic acid & 3.19\% & ND & ND & ND \\
5 & 37.65 & 2-tridecyl ester- methoxyacetic acid & ND & ND & ND & 1.76\% \\
**Esters** & **4.20\%** & **10.20\%** & **5.96\%** & **5.25\%** \\
1 & 7.92 & trichloro-acetic acid-methyl ester & ND & ND & ND & 0.50\% \\
2 & 10.26 & formic acid, heptyl ester & 2.08\% & 3.58\% & 3.25\% & 2.69\% \\
3 & 24.95 & (Z)-9,17-octadecadiene & 2.12\% & ND & ND & ND \\
4 & 32.18 & dichloroacetic acid, tridecyl ester & ND & 3.42\% & ND & ND \\
5 & 33.70 & methoxyacetic acid, 2-tetradecyl ester & ND & 1.93\% & ND & ND \\
6 & 15.03 & butyric acid ethyl ester & ND & 1.27\% & 2.71\% & 2.06\% \\
**Phenols** & **0** & **4.51\%** & **4.40\%** & **5.13\%** \\
1 & 12.16 & maltol & ND & 3.95\% & 3.76\% & 4.07\% \\
2 & 14.71 & 2-methoxy-phenol & ND & 0.56\% & 0.68\% & 1.06\% \\
**Others** & **8.80\%** & **9.84\%** & **12.23\%** & **5.02\%** \\
1 & 11.06 & 2-pentyl-furan & 7.98\% & 5.18\% & 6.96\% & 4.35\% \\
2 & 10.52 & 1,6-anhydro-\(\beta\)-D glucopyrannose & ND & 4.15\% & 4.09\% & ND \\
3 & 4.05 & dimethyl sulfide & 0.82\% & 0.51\% & 1.18\% & 0.67\% \\ \hline \hline \end{tabular}
\end{table}