# Enhancing the Flavor Profile of Summer Green Tea via Fermentation with _Aspergillus niger_ RAF106
## 3 Results
### Changes of Tea Volatiles during Fermentation
#### 3.1.2 Volatile Compounds Identified by HS-SPME-GC-MS
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{2}{*}{**No.**} & \multirow{2}{*}{**Volatile Compounds**} & \multicolumn{3}{c}{**Relative Content (\%)**} & \multirow{2}{*}{**D6**} & \multirow{2}{*}{**Odor Description**} \\  & & & & & & \\ \hline \multirow{4}{*}{11} & Tetrahydrofuran-2,2,6- & \multirow{4}{*}{ND} & \multirow{4}{*}{ND} & \multirow{4}{*}{ND} & \multirow{4}{*}{ND} & \multirow{4}{*}{ND} & \multirow{4}{*}{0.42 \(\pm\) 0.04} & \multirow{4}{*}{Floral, honey-like 2} \\  & trimethyl-6-ethylene-3- & & & & & \\  & pyranone & & & & & \\ \multirow{4}{*}{Olefins} & (R)-1-Methyl-5-(1- & \multirow{4}{*}{2} & \multirow{4}{*}{ND} & \multirow{4}{*}{ND} & \multirow{4}{*}{ND} & \multirow{4}{*}{ND} & \multirow{4}{*}{-} \\
1 & Methylvinyl) & 2.09 \(\pm\) 0.02 & & & & \\  & cyclohexene & & & & & \\
2 & \(\beta\)-Caryophyllene & 1.5 \(\pm\) 0.05 & & & & \\  & 1-Isopropyl, 2,3, & & & & & \\
3 & 5,6,8-4,7-dimethyl & 1.4 \(\pm\) 0.01 & & & & \\  & -1a-hexah-orthorthorthalene & & & & & \\
4 & (E)-5-Eicscene & 1 \(\pm\) 0.01 & & & & \\
4 & (E)-5,7-4,8,12- & \multirow{4}{*}{5} & \multirow{4}{*}{Yimetethylytridecy-1,3, 7,11-tetraene} & \multirow{4}{*}{0.88 \(\pm\) 0.03} & \multirow{4}{*}{ND} & \multirow{4}{*}{ND} & \multirow{4}{*}{-} \\
5 & Trimethyltrilecy-1,3, & & & & & \\  & 7,11-tetraene & & & & & \\
6 & \(\alpha\)-Farmesene & 1.07 \(\pm\) 0.19 & & & & \\
7 & Ocimeene & 0.58 \(\pm\) 0.04 a & & & & \\
8 & Artemisintriene & ND & ND & 0.52 \(\pm\) 0.02 & & & \\
9 & 2,4,6- Trimethyl-1,3,6- & \multirow{4}{*}{ND} & \multirow{4}{*}{ND} & \multirow{4}{*}{ND} & \multirow{4}{*}{ND} & \multirow{4}{*}{-} \\
10 & 1-Tetradecene & ND & ND & 1.04 \(\pm\) 0.01 & & & \\
11 & 2,4-Dimethyl-2-pentene & ND & ND & ND & 0.12 \(\pm\) 0.02 & & \\
12 & (-)\(\beta\)-Pinene & ND & 0.5 \(\pm\) 0.03 a & 0.38 \(\pm\) 0.02 b & 0.35 \(\pm\) 0.03 b & - \\
13 & (+)-Limonene & ND & 1.39 \(\pm\) 0.14 a & 1.39 \(\pm\) 0.02 a & 1.09 \(\pm\) 0.03 b & \multirow{4}{*}{Fruity, lemon-like 2} \\
14 & 2-Ethly-1-dodecene & ND & 1.7 \(\pm\) 0.15 a & 1.26 \(\pm\) 0.04 b & 0.96 \(\pm\) 0.04 c & - \\
15 & Neophyadiene & ND & ND & ND & 0.13 \(\pm\) 0.04 & - \\
16 & 4-Hydroymethyl, & \multirow{4}{*}{ND} & \multirow{4}{*}{ND} & \multirow{4}{*}{ND} & \multirow{4}{*}{ND} & \multirow{4}{*}{1.3 \(\pm\) 0.18 b} & \multirow{4}{*}{5.22 \(\pm\) 0.26 a} & \multirow{4}{*}{-} \\  & alcohol-3-cyclohexene & & & & & \\ Aldehydes & & & & & & \\
1 & \(\beta\)-Cyclocitral & 2.3 \(\pm\) 0.06 c & 0.67 \(\pm\) 0.12 a & 0.54 \(\pm\) 0.03 a & 0.41 \(\pm\) 0.02 b & \multirow{4}{*}{Fruity 2} \\
2 & Safranal & 1.48 \(\pm\) 0.03 a & 0.85 \(\pm\) 0.27 b & & ND & & \\  & & & & & & \\
3 & Phenylacetaldehyde & 0.87 \(\pm\) 0.03 & & ND & ND & & Honey 1 \\
4 & 2-Methylbutryldehyde & 0.78 \(\pm\) 0.04 & & ND & ND & & \\  & & & & & & \\  & & & & & & & \\
5 & Benzaldehyde & 0.6 \(\pm\) 0.03 & & ND & ND & & \\
6 & Isobutryldehyde & 0.28 \(\pm\) 0.03 & & ND & ND & & - \\
7 & Isovaleraldehyde & 0.25 \(\pm\) 0.04 & & ND & ND & & \\ Esters & & & & & & \\
1 & Dihydrokiwiolactone & 2.61 \(\pm\) 0.05 a & 0.91 \(\pm\) 0.04 b & 0.49 \(\pm\) 0.02 c & ND & Sweet 2 \\
2 & Methyl salicate & 0.87 \(\pm\) 0.07 b & 1.11 \(\pm\) 0.03 a & 0.76 \(\pm\) 0.11 b & 0.52 \(\pm\) 0.05 c & Peppermit 1,3 \\
3 & Methyl palmitate & ND & ND & 0.37 \(\pm\) 0.02 a & 0.43 \(\pm\) 0.1 a & \multirow{2}{*}{Oily, waxy, fatty 1} \\
1 & Caffe & 1.62 \(\pm\) 0.21 a & 0.55 \(\pm\) 0 b & 0.84 \(\pm\) 0.95 ab & 1.19 \(\pm\) 0.31 a & - \\
2 & N-Ethylsuccinimide & 1.21 \(\pm\) 0.03 a & ND & ND & 0.86 \(\pm\) 0.39 a & - \\
3 & Theapyrrole & 1.11 \(\pm\) 0.02 c & 6.27 \(\pm\) 0.48 b & 7.81 \(\pm\) 0.42 a & 6.9 \(\pm\) 0.52 ab & - \\ Other & & & & & & \\
1 & 2-N-Amylfuran & 0.88 \(\pm\) 0.13 & ND & ND & - \\
2 & 2-G-dimethyl & ND & 2.89 \(\pm\) 0.13 a & 2.07 \(\pm\) 0.05 b & ND & - \\
3 & 3,4-Diethylbinenys & 0.58 \(\pm\) 0.03 & ND & ND & - \\ \hline \hline \end{tabular}  
a, b, c, d different lowercase letters indicate significant differences between groups (\(p<0.05\)); ND, not detectable. Odor description was obtained from: 1 the literature with a database (Flavornet: The LRI and Odour Database); 2 [[https://baike.baidu.com/](https://baike.baidu.com/)]([https://baike.baidu.com/](https://baike.baidu.com/)), accessed on 10 August 2023; 3 [[https://www.favornet.org/favornet.html](https://www.favornet.org/favornet.html)]([https://www.favornet.org/favornet.html](https://www.favornet.org/favornet.html)), accessed on 10 August 2023; -”not defined.  
\end{table}