## 3 Results and Discussion
### Odorants in Dried Shititake Mushrooms
#### 3.2.2 Odorants Identified by DSE-SAFE
\begin{table}
\begin{tabular}{c c c c c c c c c c c c} \hline \hline
**No.** & **Compound** & \begin{tabular}{c} **Internal** \\ **Standard** \\ \end{tabular} & **Target Ion \({}^{\bullet}\)** & **IS Ion \({}^{\bullet}\)** & **Response** & **R2\({}^{\bullet}\)** & \begin{tabular}{c} **Concentrations (ug/g)** \\ **Factor** \\ \end{tabular} & \begin{tabular}{c} **Odor Threshold** \\ **in Water (ug/g)** \\ \end{tabular} & \
\begin{tabular}{c} **Odor Threshold** \\ **Fresh** \\ \end{tabular} &
\begin{tabular}{c} **OAV \({}^{\sharp}\)** \\ **Fresh** \\ \end{tabular} \\ \hline
2 & Ethyl acetate &
\begin{tabular}{c} 2-Methyl-3- \\ heptanone \\ \end{tabular} & 61 & 57 & 5.8754 & 0.9940 & - & 218.34 \(\pm\) & \(\mathrm{g}\) & - & 44 \\  & & & & Aldehydes & & & 16.35 & & & \\
3 & 3-Methyl-butanol & \begin{tabular}{c} 2-Methyl-3- \\ heptanone \\ \end{tabular} & 88 & 57 & 8.6580 & 0.9999 & \
\begin{tabular}{c} 1.39 \(\pm\) \\ 0.07 \\ \end{tabular} &
\begin{tabular}{c} 0.43 \(\pm\) \\ 0.04 \\ \end{tabular} & 0.0011 \({}^{\sharp}\) & 1263 & 394 \\
7 & Octanal &
\begin{tabular}{c} 2-Methyl-3- \\ heptanone \\ \end{tabular} & 84 & 57 & 8.6356 & 0.9995 & 0.06 & - & 0.0034 \({}^{\sharp}\) & 134 & - \\
12 & (E)-2-Octanal & \
\begin{tabular}{c} 2-Methyl-3- \\ heptanone \\ \end{tabular} & 55 & 57 & 6.2578 & 0.9950 &
\begin{tabular}{c} 1.70 \(\pm\) \\ 0.09 \\ \end{tabular} & - & 0.003 \({}^{\circ}\) & 568 & - \\
18 & Benzaldehyde & \begin{tabular}{c} 2-Methyl-3- \\ heptanone \\ \end{tabular} & 106 & 57 & 0.7579 & 0.9998 & \begin{tabular}{c} 0.02 \(\pm\) \\ 0.04 \\ \end{tabular} & \begin{tabular}{c} 0.88 \(\pm\) \\ 0.5 \\ \end{tabular} & \begin{tabular}{c} \(\pm\) \\ 0.5 \\ \end{tabular} & \
\begin{tabular}{c} 3.5 \({}^{\
\begin{tabular}{c} \(<\)1 \\ 0.69 \\ \end{tabular} \\
23 & \
\begin{tabular}{c} 2-Methyl-3- \\ heptanone \\ \end{tabular} & 81 & 57 & 29.1545 & 0.9984 &
\begin{tabular}{c} 1.33 \(\pm\) \\ 0.02 \\ \end{tabular} & - & 0.00013 \({}^{\sharp}\) & 1003 & - \\
4 & 2,3-Butanedione &
\begin{tabular}{c} 2-Ethylutyric \\ acid \\ \end{tabular} & 86 & 88 & 1.0495 & 0.9947 & - & \(0.04\pm 0\) & 0.0018 \({}^{\sharp}\) & - & 43 \\
6 & 3-Octanone & \begin{tabular}{c} 2-Methyl-3- \\ heptanone \\ \end{tabular} & 99 & 57 & 1.5314 & 1 & \begin{tabular}{c} 1.34 \(\pm\) \\ 0.03 \\ \end{tabular} & \begin{tabular}{c} \(<\)1 \\ 0.01 \(\pm\) \\ 0.0214 \({}^{\sharp}\) \\ 0.08 \\ \end{tabular} & \begin{tabular}{c} \(<\)1 \\ 0.03 \\ \end{tabular} & \begin{tabular}{c} \(<\)1 \\ 0.00016 \({}^{\sharp}\) \\ 0.00016 \({}^{\sharp}\) \\ 0.00027 \({}^{\sharp}\) \\ \end{tabular} & \
\begin{tabular}{c} 63 \\ 36,547 \\ \end{tabular} &
\begin{tabular}{c} \(<\)1 \\ 1989 \\ \end{tabular} \\
5 & Dimethyl disulfide &
\begin{tabular}{c} 2-Methyl-3- \\ heptanone \\ \end{tabular} & 94 & 57 & 0.8281 & 0.9967 & - & 1.11 \(\pm\) & 12\({}^{\ddagger}\) & - & \(<\)1 \\
11 & Dimethyl trisulfide &
\begin{tabular}{c} 2-Methyl-3- \\ heptanone \\ \end{tabular} & 126 & 57 & 0.6147 & 0.9998 & - & 0.29 \(\pm\) & 0.01 \({}^{\ddagger}\) & - & 29 \\
15 & 3-Methyl-thio-1-1-2-Methyl-3- &
\begin{tabular}{c} 2-Methyl-3- \\ heptanone \\ \end{tabular} & 104 & 57 & 3.4317 & 0.9989 & 0.04 & \(0.04\pm 0\) & 0.00043 \({}^{\sharp}\) & 313 & 83 \\
25 & 3-Methyl-thio-1-1-2-Methyl-3- &
\begin{tabular}{c} 2-Methyl-3- \\ heptanone \\ \end{tabular} & 106 & 57 & 1.4308 & 0.9999 & 0.02 \(\pm\) & 0.01 \(\pm\) & 0.0036 \({}^{\sharp}\) & 3 & \(<\)1 \\
41 & \begin{tabular}{c} 2-Methyl-3- \\ heptanone \\ \end{tabular} & 142 & 57 & 0.2681 & 0.9998 & \begin{tabular}{c} 1.09 \(\pm\) \\ 0.03 \\ \end{tabular} & \
\begin{tabular}{c} \(<\)1 \\ 0.04 \\ \end{tabular} &
\begin{tabular}{c} \(<\)1 \\ 0.00027 \({}^{\dagger}\) \\ 0.00027 \({}^{\dagger}\) \\ \end{tabular} & 4048 & 14/713 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Quantification of the predominant odorants in fresh and hot-air-dried shitake mushrooms.