## 3 Results and Discussion
### Volatile Compounds Identified by GC-MS  
As shown in Table 2, a total of 104 volatile compounds were identified by GC-MS in the three samples, and 59, 59, and 57 volatiles were identified in FTL, RT, and GT, respectively. All these identified volatiles belong to nine categories; aldehydes, alcohols, ketones, esters, and alkenes were the major volatiles. Their proportions were 15.82%, 11.86%, 8.90%, 7.58%, and 14.89%, respectively, in FTL; 6.69%, 24.94%, 8.12%, 14.27%, and 8.42%, respectively, in BT; and 16.46%, 11.58%, 19.26%, 8.20%, and 3.56%, respectively, in GT. The number and proportions of the volatile compounds are shown in Figure 4. \begin{table}
\begin{tabular}{c c c c c} \hline \hline \multirow{2}{*}{**No.**} & \multirow{2}{*}{**Volatile Compounds**} & \multicolumn{2}{c}{**Relative Content (\%)**} & \multirow{2}{*}{**Odor Description \#**} \\  & & **FTL** & **BT** & **GT** \\ \hline
**Aldehydes** & & & & \\
1 & Hexanal & 4.87 & 1.91 & 0.97 & Grassy, green, fresh, fatty \\
2 & Heptanal & 0.34 & 0.07 & 0.58 & Green, oily, grassy \\
3 & Octanal & 0.68 & ND & ND & Fruity \\
4 & (E,E)-2,4-Heptaional & 1.52 & 1.65 & 13.46 & nutty, green \\
5 & (E)-2-Octan & 1.23 & ND & ND & — \\
6 & Benzeneacetaldehyde & 2.28 & 0.83 & ND & Floral, green, sweet \\
7 & Nonanal & 2 & 0.63 & 0.48 & Floral, green, lemon-like \\
8 & 13-Tetradeconal & 0.76 & 0.38 & 0.41 & — \\
9 & 2-ethyl-Benzaldehyde & ND & ND & 0.03 & — \\
10 & Decanal & 0.8 & 0.5 & 0.31 & Orange, sweet \\
11 & safranal & 0.07 & 0.38 & ND & Herbal, fruit \\
12 & \(\beta\)-Cycloitral & 0.96 & ND & ND & Herbal, clean, rose-like, fruity \\
13 & \(\beta\)-Homocycloitral & 0.3 & 0.03 & ND & Camphor, cool wood \\
14 & Citral & ND & 0.13 & ND & — \\
15 & (E,E)-2,4-DecaIenal & ND & ND & 0.22 & Cucumber, melon \\
2-[4-methyl-6-(2,6,6-trimethylcyclohex-1-enyl)hexa-1,3-5-trienyl]cyclohex-1-en-1-carboxaldehyde & & 0.01 & 0.18 & ND & — \\
**sum** & & & **15.82** & **6.69** & **16.46** \\
**Alcohols** & & & & \\
1 & 6-Methyl- bicyclo [4.2.0]octan-7-ol & 0.28 & 0.15 & ND & — \\
2 & Linalool oxide I & ND & 1.11 & 1.48 & Sweet, floral, creamy \\
3 & Benzyl alcohol & ND & ND & 0.55 & Sweet, floral, rose-like, caramel \\
4 & 1-[(1-Ethynylcyclohexyl)oxyl]-2-propanol & 0.03 & ND & ND & — \\
5 & Linalool oxide II & ND & 1.99 & ND & Sweet, floral, creamy \\
6 & Linalool & 2.2 & 7.07 & 4.86 & Floral, fruit, green, orange-like \\
7 & 8-hydroxylinalool & ND & 0.04 & ND & — \\
8 & trans-Carveol & ND & 0.11 & ND & — \\
9 & Phenylethyl Alcohol & 2.02 & 2.14 & 0.18 & Floral, rose-like \\
10 & \(\alpha\)-Methyl-\(\alpha\)-[4-methyl-3-pentenyl] oxanemethanol & 0.14 & ND & ND & — \\
11 & linalool oxideIII & ND & 0.25 & ND & Floral, honey-like \\
12 & homocampheninol & 0.06 & ND & ND & — \\
13 & Homomytrendrol & ND & 0.41 & ND & — \\
14 & \(\alpha\)-terpineol & ND & ND & 0.12 & Pleasant, floral \\
15 & (Z)- 3,7- dimethyl- isobutyrate -2-Octen-1-ol & ND & ND & 0.26 & — \\
16 & 13-Tetradeconal & 2.14 & ND & ND & — \\
17 & Geraniol & ND & 6.27 & 0.99 & Rose-like, sweet, honey-like \\
18 & 2-methyl-4-(1,3,3- trimeth y!-7-oxa bicyclo [4.1.0] & 0.51 & ND & ND & — \\  & hept-2-y!)-3-Buten-2-ol & & & & \\
19 & (6-Hydroxymethyl-2,3- dimethylphenyl)methanol & ND & 0.88 & 1.12 & — \\
20 & & ND & 0.5 & ND & — \\
21 & 1-Heptatriacetonal & 0.62 & 0.62 & 0.61 & — \\  & 2,2,6-Trimethyl-1-(3-methyl-1,3-dienyl)-7- & & & & \\
22 & oxabicyclo & 0.07 & ND & ND & — \\  & [4.1.0]heptan-3-ol & & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Volatile compounds identified in different teas by GC-MS.