# 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
**} & \multicolumn{1}{c}{**Volatile Compounds**} & \multicolumn{3}{c}{**Relative Content (\%)**} & \multicolumn{1}{c}{**Odor Description**} \\  & & **CK** & **D2** & **D4** & **D6** & **Odor Description** \\ \hline Alcohol & & & & & & \\
1 & Linalool & 10.61 \(\pm\) 0.29 c & 13.28 \(\pm\) 0.19 b & 14.34 \(\pm\) 0.37 a & 13.95 \(\pm\) 0.55 ab & Floral, sweet 1 \\
2 & Dihydrolinalool & 10.41 \(\pm\) 0.42 a & 4.65 \(\pm\) 0.22 b & 3.24 \(\pm\) 0.09 c & 2.38 \(\pm\) 0.11 d & Rose, wood, fruity 2 \\
3 & (E)-Oxidized linalool (Furan type) & 4.1 \(\pm\) 0.12 d & 4.98 \(\pm\) 0.27 c & 7.87 \(\pm\) 0.11 b & 13.33 \(\pm\) 0.39 a & Floral 13 \\
4 & Oxidized linalool (Pyranoid type) & 3.79 \(\pm\) 0.07 b & 2.73 \(\pm\) 0.1 c & 3.32 \(\pm\) 0.88 bc & 6.47 \(\pm\) 0.27 a & Floral 13 \\
5 & \(\alpha\)-Terpinol & 3.08 \(\pm\) 0.03 & ND & ND & ND & - \\
6 & 1-Octene-3-ol & 2.76 \(\pm\) 0.19 & ND & ND & ND & Mushroom flavor 1 \\
7 & (Z)-\(\alpha\),\(\alpha\),5-Trimethyl-5- & & & & & \\  & vinyltetrahydro-drofuran-2- & 1.61 \(\pm\) 0.01 d & 2.41 \(\pm\) 0.15 c & 3.72 \(\pm\) 0.1 b & 5.32 \(\pm\) 0.09 a & Floral 2 \\  & methanol & & & & & \\
8 & 1-Methylcycloheptanol & 1.17 \(\pm\) 0.02 & ND & ND & ND & - \\
9 & Palmityl alcohol & 0.98 \(\pm\) 0.01 b & 1.01 \(\pm\) 0.01 a & 0.47 \(\pm\) 0.02 c & 0.41 \(\pm\) 0.03 d & Floral, oily 2 \\
10 & Nerol & 0.78 \(\pm\) 0.18 & ND & ND & ND & Floral, fresh, citrus 1 \\
11 & 3-Furanyl alcohol & ND & 0.79 \(\pm\) 0.12 a & 0.64 \(\pm\) 0.1 a & ND & - \\
12 & Geraniol & ND & 0.26 \(\pm\) 0.37 & ND & ND & Rose 13 \\
13 & Benzyl alcohol & ND & 2.2 \(\pm\) 0.24 a & 1.34 \(\pm\) 0.49 a & ND & Floral 13 \\
14 & Phenylethanol & ND & 4.45 \(\pm\) 1.4 b & 8.05 \(\pm\) 1.06 a & 4.77 \(\pm\) 0.99 b & Rose-like 1 \\
15 & 2,6-Dimethyl-3,7-ocadiene- & & ND & ND & ND & 1.66 \(\pm\) 0.03 & - \\
16 & (+)-\(\alpha\)-Terpinol & ND & 2.19 \(\pm\) 0.14 c & 2.8 \(\pm\) 0.03 b & 3.13 \(\pm\) 0.08 a & Floral 2 \\
17 & Ionol & ND & 2.84 \(\pm\) 0.09 c & 3.1 \(\pm\) 0.22 b & 3.38 \(\pm\) 0.05 a & Violet-like 2 \\ Alkanes & & & & & & \\
1 & Norbytane & 3.61 \(\pm\) 0.59 a & 1.61 \(\pm\) 0.35 b & 0.77 \(\pm\) 0.32 b & 1.06 \(\pm\) 0.38 b & Alkane-like 1 \\
2 & 3-Methylpentadecane & 2.88 \(\pm\) 0.07 c & 4.39 \(\pm\) 0.09 a & 5.29 \(\pm\) 0.51 a & 3.18 \(\pm\) 0.12 b & - \\
3 & 2,6,10-Trimethylpentadecane & 1.72 \(\pm\) 0.15 a & 0.58 \(\pm\) 0.14 b & 0.29 \(\pm\) 0.23 b & 0.54 \(\pm\) 0.13 b & Alkane-like 1 \\
4 & 4-Methyltetradace & 1.39 \(\pm\) 0.03 a & 1.3 \(\pm\) 0.01 b & 1.03 \(\pm\) 0.04 c & 0.85 \(\pm\) 0.01 d & Alkane-like 1 \\
5 & N-Dodecane & 1.2 \(\pm\) 0.05 d & 6.72 \(\pm\) 0.22 a & 5.94 \(\pm\) 0.13 b & 5.04 \(\pm\) 0.12 c & Honeystack-like 1 \\
6 & Theospiram & 1.17 \(\pm\) 0.02 & ND & ND & ND & Pine wood-like 2 \\
7 & 5-Methylpentadecane & 1.08 \(\pm\) 0.01 & ND & ND & ND & Alkane-like 1 \\
8 & Tridecane & 0.93 \(\pm\) 0.03 a & ND & ND & 0.35 \(\pm\) 0.02 b & Alkane-like 1 \\
9 & 3-Methyltetradace & 0.89 \(\pm\) 0.04 & ND & ND & ND & Alkane-like 1 \\
10 & 5-Methylytridecane & 0.57 \(\pm\) 0.04 a & ND & ND & 0.46 \(\pm\) 0.11 a & - \\
11 & Cyclotetadecane & ND & 0.46 \(\pm\) 0.02 a & ND & 0.91 \(\pm\) 0.01 a & - \\
12 & 9-Methylmonadecane & ND & 1.09 \(\pm\) 0.02 b & 1.31 \(\pm\) 0.05 a & 1.22 \(\pm\) 0.09 ab & Alkane-like 1 \\
13 & 9-Methyl-octadecane & ND & 0.55 \(\pm\) 0.05 a & 0.47 \(\pm\) 0.02 a & 0.48 \(\pm\) 0 a & Alkane-like 1 \\
14 & 9-Methyl-eidsane & ND & ND & ND & 0.5 \(\pm\) 0.04 & - \\
15 & 7-Methylheptadecane & ND & 1.65 \(\pm\) 0.08 a & 1.13 \(\pm\) 0.02 b & 0.89 \(\pm\) 0.01 c & - \\
16 & 6-Hexylpentadecane & ND & ND & ND & 0.36 \(\pm\) 0.07 & - \\
17 & 4-Ethytltetradace & ND & 0.59 \(\pm\) 0.01 a & ND & 0.5 \(\pm\) 0.02 b & - \\
18 & 4-Methylhexadecane & ND & 0.72 \(\pm\) 0.01 a & ND & ND & - \\
19 & 4-6-Dimethyldodecane & ND & ND & 0.5 \(\pm\) 0.01 & - \\
20 & 3-Methylundecane & ND & 2.07 \(\pm\) 0.36 a & 1.88 \(\pm\) 0.08 a & 1.33 \(\pm\) 0.05 b & - \\
21 & 3-Methylytridecane & ND & 5.9 \(\pm\) 0.09 a & ND & 4.14 \(\pm\) 0.08 a & Alkane-like 1 \\
22 & 3-Methylheptadecane & ND & 0.41 \(\pm\) 0.03 a & 0.38 \(\pm\) 0.02 a & 0.31 \(\pm\) 0.03 b & Alkane-like 1 \\
23 & 2,3-Dimethylundlecane & ND & ND & ND & 0.22 \(\pm\) 0.04 a & - \\
24 & 10-Methylynnadecane & ND & ND & 1.13 \(\pm\) 0.06 a & 0.68 \(\pm\) 0.02 b & - \\
25 & 10-Methyleicosane & ND & 0.64 \(\pm\) 0 a & 0.51 \(\pm\) 0.02 b & 0.4 \(\pm\) 0.01 c & - \\
26 & Decane & ND & ND & 0.44 \(\pm\) 0.04 a & 0.39 \(\pm\) 0.01 a & - \\ ketone & & & & & & \\
1 & Ethyl ionone & 8.99 \(\pm\) 0.12 a & 2.3 \(\pm\) 0.06 b & 1.69 \(\pm\) 0.01 c & 1 \(\pm\) 0.07 d & Violet-like 2 \\
2 & Geranyl acetone & 4.02 \(\pm\) 0.13 a & 0.44 \(\pm\) 0.05 c & 0.6 \(\pm\) 0 b & ND & Fruital 2 \\
3 & Ionone & 2.11 \(\pm\) 0.01 a & 0.36 \(\pm\) 0 b & ND & ND & Floral, violet 1
The relative content of dodecane exhibited the highest proportion among alkanes, reaching a maximum value of 6.72% after 2 days of fermentation, which signified a remarkable increase of 460% compared to CK (\(p<0.05\)).