# Effect of Blue Light Intensity During Spreading on the Aroma of Green Tea
## 3 Results
### Relationship Network Analysis of Key Volatile Compounds  
Pearson correlation analysis was performed to calculate correlation coefficients between variables. A network diagram was constructed to visualize intra-group correlations with absolute values exceeding the threshold of 0.8 and statistical significance (\(p<0.05\)), \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline \multirow{2}{*}{**No.**} & **Compound** & **Odor** & **OTs** & \multicolumn{3}{c}{**rOAV**} \\  & **Name** & **Characteristic** & **(ug/kg)** & **HBL** & **MBL** & **LBL** & **DARK** \\ \hline \multirow{2}{*}{1} & Hexanoic acid ethyl ester & citrus, green & 0.7 & 18.03 \(\pm\) 0.03 a & N.d & 17.49 \(\pm\) 0.63 a & 9.86 \(\pm\) 0.14 b \\ \hline \multirow{2}{*}{2} & (\(Z\))-2-Octen-1-ol & Sweet, green, & & & & & \\  & 1-ol & citrus, fatty, & & & & & \\  & herbal, & & & & & & \\  & cucumber- like & & & & & & \\ \hline \multirow{2}{*}{3} & Hotrienol & Fresh, & & & & & & \\  & floral, fruity & 110 & 0.52 \(\pm\) 0.01 d & 1.04 \(\pm\) 0.01 a & 0.79 \(\pm\) 0.02 b & 0.57 \(\pm\) 0.01 c \\ \hline \multirow{2}{*}{4} & 5- & 5- & & & & & \\  & Ethyldihydro- & 2(3 H)- & Caramel, nutty, & & & & \\  & 2(3 H)- & aroasted, & & & & & \\  & furanone & & & & & & \\ \hline \multirow{2}{*}{5} & Coumarin & Floral & 11 & 3.15 \(\pm\) 0.17 c & 4.9 \(\pm\) 0.06 a & 3.92 \(\pm\) 0.07 b & 3.17 \(\pm\) 0.03 c \\ \hline \multirow{2}{*}{6} & delta- & & & & & & \\  & Decalactone & Green, herbal & 66 & 7.41 \(\pm\) 0.11 b & 6.8 \(\pm\) 0.01 b & 3.84 \(\pm\) 0.08 c & 23.57 \(\pm\) 0.56 a \\ \hline \multirow{2}{*}{7} & Nerol & Fresh, citrus, & & & & & \\  & floral, green, & & & & & & \\  & sweet, & & & & & & \\  & & lemon-like & & & & & \\ \hline \multirow{2}{*}{8} & _cis_-Linalool oxide (_furanoid_) & Sweet, & & & & & \\  & oxide (_furanoid_) & floral, creamy & 190 & 0.74 \(\pm\) 0.01 c & 1.19 \(\pm\) 0.00 a & 0.82 \(\pm\) 0.02 b & 0.55 \(\pm\) 0.01 d \\ \hline \multirow{2}{*}{9} & _trans_-Linalool oxide (_furanoid_) & Sweet, & & & & & \\  & oxide (_furanoid_) & floral, creamy & 190 & 2.43 \(\pm\) 0.01 c & 3.52 \(\pm\) 0.00 a & 2.51 \(\pm\) 0.01 b & 1.65 \(\pm\) 0.02 d \\ \hline \multirow{2}{*}{10} & Geraniol & Rose-like, & & & & & \\  & sweet, & & & & & & \\  & honey-like & & & & & & \\ \hline \multirow{2}{*}{11} & Linalool & Floral, sweet, & & & & & \\  & grape- & & & & & & \\  & like, woody & & & & & & \\ \hline \multirow{2}{*}{12} & E-Citral & Citrus, & & & & & & \\  & (geranial) & lemon-like & & & & & \\ \hline \multirow{2}{*}{13} & Indole & Floral, & & & & & \\  & animal-like & & & & & & \\ \hline \multirow{2}{*}{14} & Methyl & Manty, & & & & & \\  & salicate & wintergreen- & & & & & \\  & & like & & & & & \\ \hline \multirow{2}{*}{15} & 2,6,6- & & & & & & \\  & Trimethyl-1,3- & & & & & & \\  & cyclohexadiene- & & & & & & \\  & carboxaldehyde & & & & & & \\ \hline \multirow{2}{*}{16} & Naphthalene & Pungent, tar & 0.44 & 36.68 \(\pm\) 1.39 a & 35.32 \(\pm\) 5.22 a & 41.77 \(\pm\) 1.32 a & N.d \\ \hline \end{tabular}  
* OTs: odor threshold in water based on the literature [21]. Relative odor activity value (rOAV), calculated as the ratio of odorant relative concentration in the green tea to odor thresholds in water. N.d indicates lower than the instrument detection limit. Different letters in the same column indicate a significant difference between light conditions (\(p<0.05\)).  
\end{table} 
Table 2: Aroma compounds identified in green teas under different light conditions. revealing the internal structure of metabolite interactions. Nodes represent significantly differential metabolites, colored according to their regulation patterns: red for upregulated, blue for downregulated, and gray for non-differential metabolites. Edge colors denote interaction types, with red and blue lines representing positive and negative correlations, respectively. The edge thickness corresponds to the absolute magnitude of correlation coefficients, where thicker lines indicate stronger associations.