# Metabolite Analysis of Hangzhou Gongmei White Tea of Different Varieties
## 3 Results and Discussion
### Differential Analysis of Volatile Metabolites
\begin{table}
\begin{tabular}{l c c c c c c c} \hline
**Components** & **RI\({}_{\rm r}\)** & **RI\({}_{\rm c}\)** & **CAS** & **FD** & **JK** & **LJ** & **YS** \\ \hline Hotirienol & 1621 & 1617 & 29957-43-5 & 0.57 \(\pm\) 0.08 a & 0.52 \(\pm\) 0.11 a & 0.28 \(\pm\) 0.05 b & 0.30 \(\pm\) 0.02 b \\ Nonanol & 1664 & 1666 & 143-08-8 & 14.46 \(\pm\) 1.24 a & 7.69 \(\pm\) 0.63 c & 6.55 \(\pm\) 0.71 c & 10.82 \(\pm\) 0.48 b \\ (Z)-Non-3-en-1-ol & 1693 & 1691 & 10340-23-5 & 3.13 \(\pm\) 0.24 a & 1.61 \(\pm\) 0.10 b & 0.87 \(\pm\) 0.76 c & 2.37 \(\pm\) 0.19 ab \\ \(\alpha\)-Terpineol & 1706 & 1706 & 98-55-5 & 2.34 \(\pm\) 0.21 a & 1.52 \(\pm\) 0.13 b & 0.85 \(\pm\) 0.16 c & 0.87 \(\pm\) 0.05 c \\ (\(E\),\(Z\))-Nona-3.6-dien-1-ol & 1762 & 1758 & 56805-23-3 & 0.76 \(\pm\) 0.06 a & 0.31 \(\pm\) 0.05 c & 0.19 \(\pm\) 0.02 d & 0.51 \(\pm\) 0.02 b \\ Decanol & 1766 & 1765 & 112-30-01 & 0.63 \(\pm\) 0.04 a & 0.32 \(\pm\) 0.11 b & 0.45 \(\pm\) 0.08 b & 0.32 \(\pm\) 0.03 b \\ Linalool oxide IV & 1750 & 1771 & 39028-58-5 & 6.38 \(\pm\) 1.24 a & 1.75 \(\pm\) 0.15 b & 2.32 \(\pm\) 0.25 b & 2.34 \(\pm\) 0.12 b \\ Nerol & 1808 & 1807 & 106-25-2 & 8.06 \(\pm\) 1.16 a & 5.59 \(\pm\) 0.55 b & 4.25 \(\pm\) 0.72 b & 3.60 \(\pm\) 0.17 c \\ Isogeraniol & 1820 & 1820 & 5944-20-7 & 2.17 \(\pm\) 0.24 a & 1.03 \(\pm\) 0.10 b & 0.81 \(\pm\) 0.14 c & 1.17 \(\pm\) 0.08 b \\ Geraniol & 1857 & 1859 & 106-24-1 & 144.45 \(\pm\) 20.96 a & 134.57 \(\pm\) 17.94 a & 75.91 \(\pm\) 12.96 b & 71.49 \(\pm\) 3.38 b \\ Benzyl alcohol & 1898 & 1890 & 100-51-6 & 4.11 \(\pm\) 0.57 a & 3.50 \(\pm\) 0.45 ab & 3.16 \(\pm\) 0.43 b & 4.34 \(\pm\) 0.20 a \\ Phenylethyl alcohol & 1935 & 1926 & 60-12-8 & 25.81 \(\pm\) 3.92 a & 9.45 \(\pm\) 1.26 c & 8.87 \(\pm\) 1.36 c & 14.92 \(\pm\) 0.57 b \\ Nerolidol & 2050 & 2055 & 40716-66-3 & 2.07 \(\pm\) 0.08 b & 2.60 \(\pm\) 0.34 a & 2.87 \(\pm\) 0.41 a & 1.23 \(\pm\) 0.03 c \\  & & & & 702.84 \(\pm\) 92.27 a & 407.12 \(\pm\) 45.96 b & 277.27 \(\pm\) 45.54 c & 420.83 \(\pm\) 18.15 b \\ \multicolumn{6}{l}{**Aldehydes**} \\
2-Methylbutanal & 920 & 918 & 96-17-3 & 3.01 \(\pm\) 0.48 a & 1.70 \(\pm\) 0.13 b & 1.38 \(\pm\) 0.22 b & 3.25 \(\pm\) 0.17 a \\
3-Methylbutanal & 918 & 921 & 590-86-3 & 1.36 \(\pm\) 0.28 a & 0.87 \(\pm\) 0.03 b & 0.87 \(\pm\) 0.15 b & 1.46 \(\pm\) 0.11 a \\ Pentanal & 982 & 985 & 110-62-3 &  
The relative content of different types aroma compounds was analysed (Figure 3e), with alcohols (50.87-67.08%), aldehydes (17.53-29.64%), and ketones (3.07-5.98%) account  
\begin{table}
\begin{tabular}{l c c c c c c c} \hline \hline
**Components** & **RI\({}_{\mathbf{r}}\)** & **RI\({}_{\mathbf{c}}\)** & **CAS** & **FD** & **JK** & **IJ** & **YS** \\ \hline
**Esters** & & & & & & & & \\ Hexyl acetate & 1282 & 1278 & 142-92-7 & 0.08 \(\pm\) 0.01 b & 0.04 \(\pm\) 0.00 c & 0.14 \(\pm\) 0.02 a & 0.04 \(\pm\) 0.01 c \\ Hexyl 2-methylbutyrate & 1438 & 1433 & 10032-15-2 & 0.08 \(\pm\) 0.00 b & 0.36 \(\pm\) 0.03 a & 0.41 \(\pm\) 0.08 a & 0.15 \(\pm\) 0.02 b \\ Gernatic acid methyl ester & 1700 & 1705 & 2349-14-6 & 0.79 \(\pm\) 0.18 b & 1.18 \(\pm\) 0.15 b & 1.81 \(\pm\) 0.41 a & 0.51 \(\pm\) 0.07 c \\ Methyl salicate & 1798 & 1793 & 119-36-8 & 49.42 \(\pm\) 2.80 a & 4.27 \(\pm\) 4.40 b & 3.198 \(\pm\) 3.36 c & 49.86 \(\pm\) 2.69 a \\ _cis_-Hex-3-enyl benzoate & 2148 & 2150 & 25152-85-6 & 0.16 \(\pm\) 0.01 b & 0.19 \(\pm\) 0.03 b & 0.31 \(\pm\) 0.03 a & 0.28 \(\pm\) 0.03 a \\
**Furans and derivatives** & & & & & & & \\
2-Methylfuran & 881 & 873 & 534-22-5 & 0.35 \(\pm\) 0.05 a & 0.23 \(\pm\) 0.02 b & 0.27 \(\pm\) 0.06 b & 0.20 \(\pm\) 0.01 b \\
2-Ethylfuran & 953 & 955 & 3208-16-0 & 3.49 \(\pm\) 0.41 b & 2.86 \(\pm\) 0.27 b & 3.87 \(\pm\) 0.81 a & 2.17 \(\pm\) 0.15 c \\ 2-Ethylfuran & 1130 & 1135 & 4466-24-4 & 0.37 \(\pm\) 0.04 b & 0.48 \(\pm\) 0.01 b & 0.76 \(\pm\) 0.14 a & 0.35 \(\pm\) 0.06 b \\ 2-Pentylfuran & 1234 & 1237 & 3777-69-3 & 5.15 \(\pm\) 0.23 ab & 5.15 \(\pm\) 0.32 ab & 6.60 \(\pm\) 1.50 a & 4.39 \(\pm\) 0.25 b \\ _cis_-2-(Pent-2-enyl)furan & 1296 & 1308 & 70424-13-4 & 1.00 \(\pm\) 0.27 a & 0.67 \(\pm\) 0.11 ab & 0.63 \(\pm\) 0.05 b & 0.88 \(\pm\) 0.17 ab \\  & & & & 10.36 \(\pm\) 0.76 ab & 9.40 \(\pm\) 0.40 b & 12.12 \(\pm\) 2.53 a & 8.00 \(\pm\) 0.53 b \\
**Sulphur-containing** & & & & & & & \\
**compounds** & & & & & & & \\ Dimethyl sulphide & 757 & 750 & 75-18-3 & 9.92 \(\pm\) 1.39 a & 3.36 \(\pm\) 0.25 c & 2.18 \(\pm\) 0.31 c & 4.82 \(\pm\) 0.12 b \\ Dimethyl Sulphoxide & 1579 & 1583 & 67-68-5 & 1.03 \(\pm\) 0.33 a & 0.51 \(\pm\) 0.20 b & 0.26 \(\pm\) 0.04 b & 0.00 \(\pm\) 0.00 c \\  & & & & & & & \\
**Others** & & & & & & & \\
3,5-bis(I,1- & & & & & & & \\ Dimethylly/lphenol & 2310 & 2326 & 1138-52-9 & 0.81 \(\pm\) 0.15 a & 0.47 \(\pm\) 0.09 b & 0.34 \(\pm\) 0.06 b & 0.48 \(\pm\) 0.04 b \\ Gernatic acid & 2347 & 2356 & 459-80-3 & 0.25 \(\pm\) 0.03 bc & 0.56 \(\pm\) 0.13 a & 0.33 \(\pm\) 0.05 b & 0.18 \(\pm\) 0.01 c \\  & & & & 1.05 \(\pm\) 0.18 a & 1.03 \(\pm\) 0.18 a & 0.68 \(\pm\) 0.11 b & 0.66 \(\pm\) 0.02 b \\
**Total** & & & & & & & \\  & & & & & & & \\ \hline  & RIr: retention index from NIST 20 ([[https://webbook.nist.gov/chemistry/](https://webbook.nist.gov/chemistry/)]([https://webbook.nist.gov/chemistry/](https://webbook.nist.gov/chemistry/)), accessed on 18 April 2025); & & & & & \\  & & & & & & & & \\  & & & & & & & & \\  & & & & & & & & \\  & & & & & & & & \\  & & & & & & & & \\  & & & & & & & & \\  & & & & & & & & \\  & & & & & & & & \\  & &  
ing for over 85% of the total aroma content.