## 2 Results and Discussion
### Profiles of Aldehyde Compounds
& \multirow{2}{*}{**Validic Compound**} & \multirow{2}{*}{**Chemical Formulas**} & \multirow{2}{*}{**RT (min) 1**} & \multirow{2}{*}{**RT 2**} & \multirow{2}{*}{**RT 3**} & \multirow{2}{*}{**Method 4**} & \multicolumn{2}{c}{**Ratio of \(L\)**} & \multicolumn{2}{c}{**\(L\)**} & \multicolumn{2}{c}{**\(L\)**} \\ \cline{5-10}  & & & & & & & & & **1.21** & **1.00** & **1.50** & **1.300** & **1.100** & **1.100** \\ \hline \hline \multicolumn{10}{c}{**Acid Compounds**} \\ \hline
30 & Acoustic acid & C\({}_{\rm H}\)O\({}_{2}\) & 2.56 & 619 & 622 & MS, RT, STD & 24.65 & 18.88 & 17.08 & 14.48 & 13.28 & 7.89 \\
31 & 2-Absorption acid & C\({}_{\rm H}\)O\({}_{2}\) & 3.08 & 699 & - & MS & 1.70 & 1.34 & 1.18 & 1.47 & 1.79 \\
32 & 2-Absorption-repacid & C\({}_{\rm H}\)O\({}_{2}\) & 5.12 & 752 & 753 & MS, IR & 2.28 & 5.68 & 6.64 & 5.32 & 4.85 & - \\
33 & 2-Absorption-acid & C\({}_{\rm H}\)O\({}_{2}\) & 6.30 & 793 & MS, IR & 16.63 & 12.07 & 11.40 & 11.41 & 4.02 & 0.62 \\
34 & 3-Absorption-acid & C\({}_{\rm H}\)O\({}_{2}\) & 8.22 & 845 & 845 & MS, IR & - & 3.35 & 8.33 & 6.79 & 5.04 & 4.09 \\
35 & 2-Absorption-repacid & C\({}_{\rm H}\)O\({}_{2}\) & 8.93 & 863 & - & MS & - & 5.31 & 8.15 & 5.33 & 2.74 & 3.60 \\
36 & 2-Absorption-repacid & C\({}_{\rm H}\)O\({}_{2}\) & 9.10 & 868 & - & MS & - & 7.16 & 12.42 & 12.04 & 5.92 & - \\
37 & Pentuncacid & C\({}_{\rm H}\)O\({}_{2}\) & 9.27 & 872 & 875 & MS, IR & - & 102.77 & 11.36 & 11.10 & 8.38 & - \\
38 & Lact acid & C\({}_{\rm H}\)O\({}_{2}\) & 10.82 & 914 & - & MS, STD, 667 & 5.41 & 5.41 & - & - \\
39 & Hexionic acid & C\({}_{\rm H}\)O\({}_{2}\) & 13.16 & 974 & 974 & MS, IR & 40.57 & 34.83 & 30.15 & 3.50 & 25.29 & 22.88 \\
40 & 7-Absorption-repacid & C\({}_{\rm H}\)O\({}_{2}\) & 13.36 & 967 & MS & 3.94 & - & 3.94 & - & - \\
41  
\begin{table}
\begin{tabular}{c c c c c c c c c c c c c} \hline \hline \multirow{2}{*}{**No. **} & \multirow{2}{*}{**Volatile Compound**} & \multirow{2}{*}{**Chemical Formula**} & \multirow{2}{*}{**RT (min) 1** [FOOTNOTE:1]Footnote 1: Retention time: 2 Retention index of unknown Compounds on an HP-SMS column calculated against the gas chromatography-mass spectrometry (GC-MS) retention time of \(n\)=alkanes (C3-C25).3 RI from database ([[http://webbook.nist.gov/chemistry](http://webbook.nist.gov/chemistry)]([http://webbook.nist.gov/chemistry](http://webbook.nist.gov/chemistry))): 4 RI, agreed with retention index in the literature; MS, compared with NIST 11 Mass Spectral Database; STD,  
The concentrations of 3-hydroxybutanal and (_E_)-2-pentenal ranged from 1.16 to 6.96 and from 1.27 to 5.44 \(\upmu\)g/L, respectively, reaching maximum values in the 1:1000 combination. Although 3-hydroxybutanal and (_E_)-2-pentenal had lower threshold values of 27 and 1.2 \(\upmu\)g/L, respectively, only the level of (_E_)-2-pentenal in samples was above the limit of detection. In addition to the above-mentioned aldehyde compounds, the concentrations of (_E_)-2-heptenal, (_E_,_E_)-2,4-heptadiene, (_E_)-2-nonenal, and (_E_)-2-hexenal reached maximum values in the 1:1 and 1:50 treatment combinations, respectively. These observations were similar to the results of [PERSON] et al., (2011), who observed changes in (_E_)-2-heptenal, (_E_,_E_)-2,4-heptadiene, and (_E_)-2-nonenal in fermented camels' milk, and of [PERSON] et al. who reported changes in levels of (_E_)-2-hexenal in olive oil [(14; 31)].