## 2 Results and Discussion
### Volatile Organic Chemicals (VOCs) Profile
\begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline \multirow{2}{*}{**Storage Time**} & \multirow{2}{*}{**Samples**} & \multirow{2}{*}{**Asp**} & \multirow{2}{*}{**Thr**} & \multirow{2}{*}{**Ser**} & \multirow{2}{*}{**Glu**} & \multirow{2}{*}{**Gly**} & \multirow{2}{*}{**Ala**} & \multirow{2}{*}{**Val**} & \multirow{2}{*}{**Met**} \\ \hline Day 0 & & 4.98 \(\pm\) 0.12 & 8.92 \(\pm\) 0.67 & 17.08 \(\pm\) 1.51 & 9.23 \(\pm\) 1.16 & 30.22 \(\pm\) 0.14 & 30.2 \(\pm\) 1.86 & 27.78 \(\pm\) 4.24 & 2.68 \(\pm\) 0.58 \\ \hline \multirow{11}{*}{Day 15} & AP & 13.33 \(\pm\) 11.44 & 10.82 \(\pm\) 0.26 & 16.86 \(\pm\) 10.14 & 16.76 \(\pm\) 0.22 cd & 35.27 \(\pm\) 0.06 & 34.92 \(\pm\) 0.66 & 28.01 \(\pm\) 0.27 & 4.68 \(\pm\) 0.23 cd \\  & VP & 10.09 \(\pm\) 0.90 & 10.26 \(\pm\) 12.99 & 1.102 \(\pm\) 0.85 & 20.99 \(\pm\) 0.41 & 24.42 \(\pm\) 0.55 d & 2.658 \(\pm\) 0.36c & 17.81 \(\pm\) 0.2k b & 7.11 \(\pm\) 0.74a \\ \cline{1-1}  & MAP1 & 13.25 \(\pm\) 10.40 b & 8.71 \(\pm\) 0.18 & 11.33 \(\pm\) 0.75 & 16.78 \(\pm\) 0.29 cd & 24.91 \(\pm\) 0.02 & 26.16 \(\pm\) 0.35d & 12.06 \(\pm\) 0.49 & 4.95 \(\pm\) 0.11 cd \\ \cline{1-1}  & MAP2 & 12.13 \(\pm\) 0.85c & 10.73 \(\pm\) 0.23 & 13.78 \(\pm\) 1.29 & 1.280 \(\pm\) 0.78 & 26.24 \(\pm\) 0.004 & 2.133 \(\pm\) 0.37 & 10.58 \(\pm\) 0.64 & 3.91 \(\pm\) 0.19 \\ \cline{1-1}  & MAP3 & 16.24 \(\pm\) 2.04a & 9.03 \(\pm\) 21.88 b & 8.10 \(\pm\) 0.36e & 19.36 \(\pm\) 0.29 & 22.82 \(\pm\) 0.42 & 25.21 \(\pm\) 0.63c & 8.91 \(\pm\) 0.22 & 6.68 \(\pm\) 0.09b \\ \cline{1-1}  & MAP4 & 14.18 \(\pm\) 2.03 ab & 10.65 \(\pm\) 2.19 & 9.4 \(\pm\) 0.16 & 17.11 \(\pm\) 0.32 & 25.01 \(\pm\) 0.01 c & 27.74 \(\pm\) 0.29 b & 14.36 \(\pm\) 0.11 c & 6.54 \(\pm\) 0.15 a \\ \hline \multirow{11}{*}{Day 27} & MAP1 & 31.7 \(\pm\) 0.36 & 9.88 \(\pm\) 0.05 & 13.08 \(\pm\) 0.12 & 14.26 \(\pm\) 0.12e & 16.46 \(\pm\) 0.03b & 15.38 \(\pm\) 0.28 d & 23.51 \(\pm\) 2.11 & 2.99 \(\pm\) 0.53a \\ \cline{1-1}  & MAP2 & 5.11 \(\pm\) 0.13a & 12.26 \(\pm\) 0.12a & 11.46 \(\pm\) 0.07 & 18.86 \(\pm\) 0.13 a & 20.42 \(\pm\) 0.18 & 18.88 \(\pm\) 0.39 c & 15.45 \(\pm\) 1.03 b & 23.41 \(\pm\) 0.16 b \\ \cline{1-1}  & MAP3 & 27.33 \(\pm\) 0.18 bc & 9.55 \(\pm\) 0.08 b & 9.56 \(\pm\) 0.26 & 12.70 \(\pm\) 1.15b & 10.20 \(\pm\) 0.16 d & 21.41 \(\pm\) 12.5b & 8.75 \(\pm\) 0.11 d & 2.67 \(\pm\) 0.16 a \\ \cline{1-1}  & MAP4 & 1.79 \(\pm\) 0.08 d & 6.18 \(\pm\) 0.15 c & 5.34 \(\pm\) 0.23 d & 14.02 \(\pm\) 0.35 b & 13.23 \(\pm\) 0.42 c & 2.296 \(\pm\) 0.32 a & 11.18 \(\pm\) 1.35 c & 1.12 \(\pm\) 0.13 c \\ \hline \multicolumn{1}{c}{} & \multicolumn{1}{c}{**Ile**} & \multicolumn{1}{c}{**Les**} & \multicolumn{1}{c}{**Tyr**} & \multicolumn{1}{c}{**Phe**} & \multicolumn{1}{c}{**Lys**} & \multicolumn{1}{c}{**His**} & \multicolumn{1}{c}{**Arg**} & \multicolumn{1}{c}{**Pro**} & \multicolumn{1}{c}{**Total**} \\ \hline Day 0 & 2.51 \(\pm\) 0.41 & 45.22 \(\pm\) 0.02 & 1.54 \(\pm\) 0.08 & 4.09 \(\pm\) 0.43 & 84.51 & 1.91 \(\pm\) 0.55 & 2.99 \(\pm\) 0.25 & 6.23 \(\pm\) 0.15 & 162.88 \(\pm\) 8.58 \\ \cline{1-1}  & AP & 4.45 \(\pm\) 0.55 & 5.79 \(\pm\) 0.13e & 3.5 \(\pm\) 0.6 d & 6.88 \(\pm\) 11.2b & 2.87 \(\pm\) 0.16 e & 9.65 \(\pm\) 0.32 a & 6.07 \(\pm\) 0.43b c & 9.8 \(\pm\) 0.35 a & 209.75 \(\pm\) 5.9a \\ \cline{1-1}  & VP & 7.35 \(\pm\) 0.19a & 10.06 \(\pm\) 0.05 a  
\begin{table}
\begin{tabular}{c c c c c c c c c c c c c c} \hline \hline \multicolumn{1}{c}{**Compounds**} & \multicolumn{1}{c}{**0.6**} & \multicolumn{1}{c}{**15-4**} & \multicolumn{1}{c}{**27.4**} & \multicolumn{1}{c}{**Odew Description**} & \multicolumn{1}{c}{**Reference**} \\ \hline \multicolumn{1}{c}{**Methods**} & & & & & & & & & & & & & & & \\ \hline \hline
Aldehyde has low threshold values and the abundance of aldehyde increased in all turbot samples during storage. Some aldehyde generated from lipid oxidation, especially for the unsaturated fatty acids. Therefore, VOCs generated from the process of lipid oxidation are generally recognized as one of the leading causes of quality deterioration in aquatic products [40].