## 3 Results
### Effect of Withering Time on the Volatile Compounds
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**RT** & **RI** & **Compound Names** & **WT4** & **WT6** & **WT8** & **WT10** & **WT12** \\ \hline Acids & & & & & & & \\
6.9 & 990 & Hexanoic acid & 0.46 \(\pm\) 0.09 \({}^{\mathrm{a}}\) & 0.55 \(\pm\) 0.08 \({}^{\mathrm{a}}\) & 0.72 \(\pm\) 0.08 \({}^{\mathrm{b}}\) & 0.63 \(\pm\) 0.08 \({}^{\mathrm{b}}\) & 0.68 \(\pm\) 0.07 \({}^{\mathrm{b}}\) \\
24.16 & 1355 & Geranic acid & 0.16 \(\pm\) 0.09 \({}^{\mathrm{ab}}\) & 0.17 \(\pm\) 0.01 \({}^{\mathrm{ab}}\) & 0.25 \(\pm\) 0.01 \({}^{\mathrm{b}}\) & 0.20 \(\pm\) 0.02 \({}^{\mathrm{ab}}\) & 0.14 \(\pm\) 0.01 \({}^{\mathrm{a}}\) \\
40.41 & 1768 & Tetradecanoic acid & 0.05 \(\pm\) 0.01 \({}^{\mathrm{ab}}\) & 0.03 \(\pm\) 0.00 \({}^{\mathrm{a}}\) & 0.14 \(\pm\) 0.03 \({}^{\mathrm{c}}\) & 0.08 \(\pm\) 0.03 \({}^{\mathrm{b}}\) & 0.03 \(\pm\) 0.00 \({}^{\mathrm{ab}}\) \\ Alcohols & & & & & & \\
8.43 & 1030 & 1-Hexanol, 2-ethyl- & 0.82 \(\pm\) 0.21 \({}^{\mathrm{a}}\) & 1.29 \(\pm\) 0.32 \({}^{\mathrm{b}}\) & 0.51 \(\pm\) 0.06 \({}^{\mathrm{a}}\) & 2.42 \(\pm\) 0.25 \({}^{\mathrm{c}}\) & 2.43 \(\pm\) 0.09 \({}^{\mathrm{c}}\) \\
8.62 & 1036 & Benzyl alcohol & 3.02 \(\pm\) 0.23 \({}^{\mathrm{a}}\) & 3.86 \(\pm\) 0.15 \({}^{\mathrm{ab}}\) & 4.07 \(\pm\) 0.46 \({}^{\mathrm{b}}\) & 3.85 \(\pm\) 0.25 \({}^{\mathrm{ab}}\) & 3.07 \(\pm\) 0.05 \({}^{\mathrm{a}}\) \\
9.93 & 1074 & Linalool oxide & 1.82 \(\pm\) 0.10 \({}^{\mathrm{a}}\) & 2.26 \(\pm\) 0.02 \({}^{\mathrm{bc}}\) & 2.28 \(\pm\) 0.38 \({}^{\mathrm{bc}}\) & 2.57 \(\pm\) 0.02 \({}^{\mathrm{c}}\) & 2.01 \(\pm\) 0.06 \({}^{\mathrm{ab}}\) \\
10.54 & 1087 & trans-Linalool oxide & 2.25 \(\pm\) 0.15 \({}^{\mathrm{a}}\) & 2.69 \(\pm\) 0.11 \({}^{\mathrm{b}}\) & 2.56 \(\pm\) 0.43 \({}^{\mathrm{ab}}\) & 2.57 \(\pm\) 0.09 \({}^{\mathrm{ab}}\) & 2.40 \(\pm\) 0.07 \({}^{\mathrm{ab}}\) \\
11.06 & 1099 & Linalool & 2.20 \(\pm\) 0.11 \({}^{\mathrm{a}}\) & 2.73 \(\pm\) 0.03 \({}^{\mathrm{b}}\) & 2.76 \(\pm\) 0.02 \({}^{\mathrm{b}}\) & 3.55 \(\pm\) 0.35 \({}^{\mathrm{c}}\) & 2.53 \(\pm\) 0.19 \({}^{\mathrm{ab}}\) \\
11.6 & 1116 & Phenylethyl alcohol & 4.14 \(\pm\) 0.24 \({}^{\mathrm{a}}\) & 4.60 \(\pm\) 0.57 \({}^{\mathrm{b}}\) & 5.67 \(\pm\) 0.77 \({}^{\mathrm{bc}}\) & 6.41 \(\pm\) 0.29 \({}^{\mathrm{c}}\) & 5.61 \(\pm\) 0.47 \({}^{\mathrm{bc}}\) \\
14.41 & 1173 & Linalool oxide II & 1.25 \(\pm\) 0.31 \({}^{\mathrm{a}}\) & 1.15 \(\pm\) 0.03 \({}^{\mathrm{a}}\) & 1.36 \(\pm\) 0.21 \({}^{\mathrm{a}}\) & 1.36 \(\pm\) 0.23 \({}^{\mathrm{a}}\) & 1.27 \(\pm\) 0.02 \({}^{\mathrm{a}}\) \\
15.66 & 1189 & \(\alpha\)-Terpineol & 0.30 \(\pm\) 0.07 \({}^{\mathrm{a}}\) & 0.41 \(\pm\) 0.00 \({}^{\mathrm{b}}\) & 0.43 \(\pm\) 0.01 \({}^{\mathrm{b}}\) & 0.43 \(\pm\) 0.01 \({}^{\mathrm{b}}\) & 0.43 \(\pm\) 0.01 \({}^{\mathrm{b}}\) \\  & & Bicyclo[3.1.1]hept-2- & & & & & \\
15.82 & 1198 & ene-2-ethanol,6,6- & ND & ND & 0.05 \(\pm\) 0.01 \({}^{\mathrm{a}}\) & 0.10 \(\pm\) 0.01 \({}^{\mathrm{b}}\) & 0.08 \(\pm\) 0.00 \({}^{\mathrm{ab}}\) \\  & dimethyl- & & & & & & \\
17.3 & 1228 & Nerol & 0.63 \(\pm\) 0.07 \({}^{\mathrm{a}}\) & 0.67 \(\pm\) 0.01 \({}^{\mathrm{a}}\) & 0.73 \(\pm\) 0.05 \({}^{\mathrm{a}}\) & 0.76 \(\pm\) 0.04 \({}^{\mathrm{b}}\) & 0.62 \(\pm\) 0.02 \({}^{\mathrm{a}}\) \\
17.59 & 1240 & trans-Isogeraniol & 0.33 \(\pm\) 0.11 \({}^{\mathrm{a}}\) & 0.33 \(\pm\) 0.01 \({}^{\mathrm{a}}\) & 0.43 \(\pm\) 0.04 \({}^{\mathrm{b}}\) & 0.38 \(\pm\) 0.02 \({}^{\mathrm{ab}}\) & 0.32 \(\pm\) 0.06 \({}^{\mathrm{a}}\) \\
18.82 & 1255 & Geraniol & 1.31 \(\pm\) 0.05 \({}^{\mathrm{a}}\) & 1.64 \(\pm\) 0.22 \({}^{\mathrm{b}}\) & 2.05 \(\pm\) 0.03 \({}^{\mathrm{c}}\) & 2.38 \(\pm\) 0.05 \({}^{\mathrm{d}}\) & 2.02 \(\pm\) 0.08 \({}^{\mathrm{c}}\) \\
22.52 & 1317 & trans-Farnesol & 0.48 \(\pm\) 0.08 \({}^{\mathrm{a}}\) & 0.43 \(\pm\) 0.01 \({}^{\mathrm{a}}\) & 0.59 \(\pm\) 0.05 \({}^{\mathrm{a}}\) & 0.75 \(\pm\) 0.04 \({}^{\mathrm{b}}\) & 0.58 \(\pm\) 0.03 \({}^{\mathrm{a}}\) \\
28.02 & 1436 & 1-Dodecanol, & ND & ND & 0.13 \(\pm\) 0.01 \({}^{\mathrm{a}}\) & 0.13 \(\pm\) 0.00 \({}^{\mathrm{a}}\) & 0.14 \(\pm\) 0.01 \({}^{\mathrm{a}}\) \\
34.75 & 1564 & trans-Nerolidol & 0.40 \(\pm\) 0.08 \({}^{\mathrm{ab}}\) & 0.34 \(\pm\) 0.01 \({}^{\mathrm{a}}\) & 0.39 \(\pm\) 0.02 \({}^{\mathrm{ab}}\) & 0.53 \(\pm\) 0.04 \({}^{\mathrm{b}}\) & 0.41 \(\pm\) 0.05 \({}^{\mathrm{Effect of Withering Time on Antioxidant Activity, on Inhibitory Capacity against \(\alpha\)-amylase and \(\alpha\)-glucosidase Activity, and on Inhibitory Capacity against Glucose Uptake in Caco-2 Cell Lines  
The 2,2-diphenyl-1-picrylhydrazzyl (DPPH) was used to analyze the antioxidant activity and the results show a significant difference (\(p<0.05\)) in the free radical scavenging activity of black tea among five withering treatments (Table 4).