## 3 Results and Discussion
### Volatile Free Aroma Compounds
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**Classification**} & \multirow{2}{*}{**Aroma Compounds**} & \multirow{2}{*}{**RT (min)**} & \multirow{2}{*}{**Identification**} & \multicolumn{3}{c}{**The Level of Berry Thinning (\%)**} \\ \cline{5-6}  & & & & **0** & **30** & **50** \\ \hline \multirow{2}{*}{Esters} & Ethyl octanoate & 18.24 & Mass spectrum & 0.2 \(\pm\) 0.05 & N.D & N.D \\  & Methyl salicate & 30.73 & Standard & 1.1 \(\pm\) 0.4 & 0.4 \(\pm\) 0.1 & N.D \\ \hline \multirow{4}{*}{Ketones} & 2,2-dimethyl-3-octanone & 23.57 & Mass spectrum & 0.6 \(\pm\) 0.1 \({}^{\text{ab}}\) & 0.8 \(\pm\) 0.2 \({}^{\text{a}}\) & 0.4 \(\pm\) 0.03 \({}^{\text{b}}\) \\  & 2-Heptanone & 7.50 & Standard & 1.2 \(\pm\) 0.2 \({}^{\text{a}}\) & 0.4 \(\pm\) 0.1 \({}^{\text{b}}\) & 0.2 \(\pm\) 0.08 \({}^{\text{b}}\) \\  & 2-Octanone & 11.76 & Standard & 2.9 \(\pm\) 0.6 \({}^{\text{a}}\) & 0.8 \(\pm\) 0.4 \({}^{\text{b}}\) & 0.4 \(\pm\) 0.06 \({}^{\text{b}}\) \\  & 4-Methyl-2-Heptanone & 8.61 & Mass spectrum & N.D & N.D & 0.2 \(\pm\) 0.03 \\  & 6-Methyl-5-hepten-2-one & 14.13 & Standard & 3.5 \(\pm\) 0.7 \({}^{\text{a}}\) & 3.8 \(\pm\) 0.1 \({}^{\text{a}}\) & 2.8 \(\pm\) 0.4 \({}^{\text{a}}\) \\ \hline \multirow{4}{*}{Monoterpenes} & (E)-Linalool oxide & 18.44 & Standard & N.D & 7.9 \(\pm\) 1.0 & 8.7 \(\pm\) 1.4 \\  & (E)-\(\beta\)-Ocimeone & 9.82 & Standard & 0.2 \(\pm\) 0.03 \({}^{\text{a}}\) & 0.3 \(\pm\) 0.1 \({}^{\text{a}}\) & 0.3 \(\pm\) 0.07 \({}^{\text{a}}\) \\  & (R)-(+)Limonene & 7.82 & Standard & 0.1 \(\pm\) 0.03 \({}^{\text{a}}\) & 0.2 \(\pm\) 0.05 \({}^{\text{a}}\) & 0.2 \(\pm\) 0.09 \({}^{\text{a}}\) \\  & (Z)-Citral & 27.64 & Standard & N.D & 0.2 \(\pm\) 0.003 \({}^{\text{a}}\) & 0.2 \(\pm\) 0.004 \({}^{\text{b}}\) \\  & (Z)-\(\beta\)-Ocimeone & 10.48 & Standard & 0.2 \(\pm\) 0.04 \({}^{\text{b}}\) & 0.4 \(\pm\) 0.1 \({}^{\text{a}}\) & 0.3 \(\pm\) 0.08 \({}^{\text{ab}}\) \\  & Epoxylinalool & 30.13 & Mass spectrum & N.D & 1.8 \(\pm\) 0.4 & 2.8 \(\pm\) 0.7 \\  & Geraniol & 34.15 & Standard & 13.4 \(\pm\) 2.2 \({}^{\text{b}}\) & 26.9 \(\pm\) 1.5 \({}^{\text{a}}\) & 8 \(\pm\) 1.3\({}^{\text{c}}\) \\  & Horihenol & 25.63 & Mass spectrum & 12.4 \(\pm\) 1.0 \({}^{\text{b}}\) & 16.7 \(\pm\) 0.4 \({}^{\text{a}}\) & 9.7 \(\pm\) 1.5 \({}^{\text{c}}\) \\  & Linalool & 23.25 & Standard & 38.7 \(\pm\) 2.7 \({}^{\text{c}}\) & 76.6 \(\pm\) 1.0 \({}^{\text{b}}\) & 116.3 \(\pm\) 1.0 \({}^{\text{a}}\) \\  & Nerol & 32.39 & Standard & 1.9 \(\pm\) 0.5 \({}^{\text{b}}\) & 5.9 \(\pm\) 1.0 \({}^{\text{a}}\) & 1.7 \(\pm\) 0.2 \({}^{\text{b}}\) \\  & Nerol oxide & 19.90 & Mass spectrum & 1.8 \(\pm\) 0.09 & 1.1 \(\pm\) 0.4 & N.D \\  & Terpinen-4-ol & 24.46 & Standard & N.D & N.D & 0.2 \(\pm\) 0.08 \\  & Terpinione & 11.47 & Standard & N.D & 0.1 \(\pm\) 0.03 & 0.2 \(\pm\) 0.06 \\  & \(\alpha\)-Terpineol & 28.46 & Standard & 13.4 \(\pm\) 1.2 \({}^{\text{a}}\) & 13.2 \(\pm\) 3.3 \({}^{\text{a}}\) & 22.4 \(\pm\) 5.4 \({}^{\text{a}}\) \\  & \(\beta\)-Citronellol & 31.33 & Standard & 1.7 \(\pm\) 0.3 \({}^{\text{a}}\) & 1.9 \(\pm\) 0.3 \({}^{\text{a}}\) & 0.4 \(\pm\) 0.1 \({}^{\text{b}}\) \\  & \(\beta\)-Myrcene & 7.02 & Standard & N.D & 0.2 \(\pm\) 0.07 & 0.1 \(\pm\) 0.03 \\  & \(\beta\)-Pinene & 6.85 & Standard & 0.2 \(\pm\) 0.04 \({}^{\text{b}}\) & 0.6 \(\pm\) 0.1