## 3 Results and Discussion
### Determination of Volatile Substances
#### 3.2.2 Results of GC-MS Measured Volatile Substances in Hairtail Surimi
\begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline \multirow{2}{*}{**Number**} & \multirow{2}{*}{**Compounds**} & \multirow{2}{*}{**CAS**} & \multicolumn{6}{c}{**Relative Content/\%**} \\ \cline{4-9}  & & & **Blank** & **0 h** & **1 h** & **3 h** & **5 h** \\ \hline
1 & Ethanol & 000064-17-5 & 2.64 & 2.04 & 3.48 & 6.57 & 12.06 \\
2 & 1,3-Butanediol, (S)- & 024621-61-2 & nd & 0.39 & nd & nd & nd \\
3 & 1-Penten-3-ol & 000616-25-1 & 2.2 & 2 & 2.71 & 3.26 & 4.13 \\
4 & Piperidine-4-ol, 1,2,5-trimethyl-4-(2,4,5-trimethylphenyl)- & 1000259-69-6 & nd & 0.59 & nd & nd & nd \\
5 & 1-Hexanol & 000111-27-3 & 1.52 & 1.38 & nd & 3 & 4.2 \\
6 & 1H-Inden-5-ol, 2,3-dihydro- & 001470-94-6 & nd & 0.59 & nd & nd & nd \\
7 & Ethanol, 2-(vinyloxy)- & 000764-48-7 & nd & 0.76 & nd & nd & nd \\
8 & Butyldimethyllysilyloxy)ethoxyylethyloxy]ethoxyylethylhanol & 1000352-10-3 & nd & 0.39 & nd & nd & 0.68 \\
9 & 1-Pentanol & 000071-41-0 & 0.74 & nd & 0.97 & 0.94 & 1.33 \\
10 & 2-Penten-1-ol, (Z)- & 001576-95-0 & 0.64 & nd & 0.55 & 0.53 & 0.89 \\
11 & Ethanol, 2-[2-(2-butoxyethoxy)ethoxy]- & 000413-22-6 & nd & nd & 0.54 & nd & nd \\
12 & (3-Methyl-oxiran-2-yl)-methanol & 1000194-22-9 & nd & nd & nd & 0.75 & nd \\
13 & Silanol, trimethyl- & 001066-40-6 & nd & nd & nd & nd & 1.07 \\
14 & 1-Butanol, 3-methyl- & 000123-51-3 & 1.18 & nd & nd & nd & 8.79 \\
15 & 2-Octanol & 000123-96-6 & nd & nd & nd & nd & 1.01 \\
16 & 1-Octen-3-ol & 003391-86-4 & 3.81 & nd & nd & nd & 2.89 \\
17 & Phenylethyl Alcohol & 000060-12-8 & 1.49 & nd & nd & nd & 1.67 \\
18 & 2-Octanol & 000123-96-6 & 2.27 & nd & nd & nd & nd \\
19 & 2-Octen-1-ol, (E)- & 018409-17-1 & 0.7 & nd & nd & nd & nd \\
20 & Cyclobutaneethanol, \(\_\)beta\(\_\)-methylene- & 116203-80-6 & 1.18 & nd & nd & nd & nd \\
21 & Ethyl Acetate & 000141-78-6 & 2.33 & 0.63 & 1.63 & 2.53 & 3.15 \\
22 & 2-Ethyl-1-hexanol, pentafluoropropionate & 1000365-51-1 & nd & 1.44 & nd & nd & nd \\
23 & 2-Ethyl-1-hexanol, trifluoroacetate & 1000365-19-6 & 0.77 & nd & nd & nd & 3.05 \\
24 & Formic acid, hex-2-yl ester & 1000368-21-9 & nd & nd & 1.07 & nd & nd \\
25 & Arsenous acid, tris(trimethylsilyl) ester & 055429-29-3 & nd & nd & 2.06 & nd & nd \\
26 & Hexyl chloroformate & 006092-54-2 & nd & nd & 2.01 & nd & nd \\
27 & 2-Ethyl-1-hexanol, pentafluoropropionate & 1000365-51-1 & nd & nd & 2.58 & nd & nd \\
28 & 3-Hydroxmandelic acid, ethyl ester, di-TMS & 1000071-88-9 & nd & nd & 1.27 & nd & nd \\
29 & Thiocyanic acid carbazol-3,6-diyl ester & 040736-18-3 & 1.39 & nd & 0.98 & 0.98 & nd \\
30 & Silanol, trimethyl-, propanoate & 016844-98-7 & nd & nd & 0.75 & 0.74 & nd \\
31 & Propanoic acid, pentyl ester & 000624-54-4 & nd & nd & nd & 2.83 & nd \\
32 & 1-Octyl trifluoroacetate & 02561-21-9 & nd & nd & nd & 0.69 & nd \\
33 & Arsenous acid, tris(trimethylsilyl) ester & 055429-29-3 & 5.95 & nd & nd & 1.2 & nd \\
34 & Dicyclopropylmethanol, chlorodifluoroacetate & 1000376-25-1 & 0.84 & nd & nd & nd & nd \\
35 & Formic acid, heptyl ester & 000112-23-2 & 1.41 & nd & nd & nd & nd \\
36 &.gamma.-Guainidinobutyric acid & 000463-00-3 & nd & 0.54 & nd & nd & nd \\ \hline \hline \end{tabular}
\end{table} 
Table 1: The relative contents of volatile compounds in hairtail surimi during fermentation.