## 3 Results and Discussion
### Variation of Volatile Compounds in XYMJ Green Teas
**} & \multirow{2}{*}{**Volatile Compounds**} & \multicolumn{2}{c}{**XYMJ Spring Teas**} & \multicolumn{2}{c}{**XYMJ Autumn Teas**} \\ \cline{5-8}  & & & & **Range** & **Average** & **Range** & **Average** \\ \hline
1 & 1.873 & 75-18-3 & dimethyl sulfide & 0.57–3.98 & 2.66 b  & 8.05–11.95 & 9.06 a  \\
2 & 4.916 & 66-25-1 & hexanal & 5.41–15.04 & 9.01 a  & 2.77–6.16 & 4.03 b  \\
3 & 8.688 & 111-71-7 & heptanal & 2.81–17.20 & 7.18 a  & 1.33–3.24 & 2.65 b  \\
4 & 11.359 & 100-52-7 & benzaldehyde & 5.25–10.60 & 7.08 a  & 3.90–5.59 & 4.91 b  \\
5 & 12.383 & 26001-58-1 & 1-octen-3-ol & 1.07–3.62 & 2.04 & 1.06–3.40 & 2.08 \\
6 & 12.631 & 585-25-1 & 2,3-octanedione & 2.04–4.46 & 2.64 & 3.35–3.90 & 3.61 \\
7 & 12.774 & 127-91-3 & (\(\pm\))-\(\beta\)-pinene & 0–5.04 & 1.92 & 0–0.99 & 0.49 \\
8 & 12.869 & 110-93-0 & 6-methyl-5-heptene-2-one & 1.31–3.90 & 2.46 & 0–6.28 & 1.85 \\
9 & 13.412 & 28973-97-9 & (62)-farmesene & 0–51.39 & 12.85 & 0–5.25 & 2.21 \\
10 & 14.488 & 874-41-9 & 1,3-dimethyl-4-ethylbenzene & 0–3.43 & 1.58 & 0–0.54 & 0.17 \\
11 & 14.683 & 5989-27-5 & limonene & 3.09–29.04 & 14.17 a  & 1.22–5.78 & 3.18 b  \\
12 & 15.759 & 13466-78-9 & 3-carene & 1.44–6.40 & 4.36 & 4.34–7.75 & 6.39 \\
13 & 16.216 & 29050-33-7 & (+)-4-carene & 0–3.56 & 0.89 & / & 0.00 \\
14 & 16.921 & 69668-93-5 & 3-decyn-2-ol & 10.45–15.07 & 12.10 a  & 4.93–8.40 & 6.50 b  \\
15 & 17.717 & 34995-77-2 & Linalool oxide (trans-furanoid) & 0–5.33 & 2.69 & 2.07–3.22 & 2.81 \\
16 & 18.34 & 78-70-6 & linalool & 77.70–103.23 & 88.97 & 86.29–115.74 & 100.77 \\
17 & 18.545 & 124-19-6 & nonanal & 24.20–51.62 & 34.51 & 22.56–32.80 & 27.41 \\
18 & 18.912 & 60-12-8 & Phenylethyl alcohol & 0–3.27 & 2.30 & 0.88–4.25 & 2.56 \\
19 & 21.875 & 39028-58-5 & Linalool oxide (trans-pyranolol) & 0–3.56 & 1.21 & 0–7.77 & 3.81 \\
20 & 22.112 & 91-20-3 & naphthalene & 2.76–9.39 & 4.53 & 3.57–6.25 & 4.57 \\
21 & 22.545 & 53398-84-8 & trans-3-hexenyl butyrate & 6.67–23.70 & 14.69 & 5.85–16.20 & 9.08 \\
22 & 22.783 & 119-36-8 & methyl salicylate & 13.37–26.56 & 19.01 a  & 9.64–16.64 & 11.47 b  \\
23 & 23.412 & 112-31-2 & decanal & 4.73–6.00 & 5.30 & 3.50–8.61 & 6.29 \\
24 & 24.021 & 4322-25-7 & \(\beta\)-cyclodextrin & 2.31–3.39 & 2.87 & 3.38–14.72 & 9.61 \\
25 & 24.116 & 21777-77-7 & methyl 2-methylpentanoate & 9.68–23.67 & 17.95 & 17.15–28.90 & 24.67 \\
26 & 24.679 & 53398-85-9 & cis-3-hexenyl-\(\alpha\)-methylbutyrate & 6.24–22.02 & 13.04 & 7.27–14.07 & 9.26 \\
27 & 25.731 & 106-24-1 & geraniol & 111.71–190.69 & 150.72 a  & 29.15–136.04 & 64.77 b  \\
28 & 27.208 & 91-57-6 & 2-methylnaphthalene & 0–1.71 & 0.61 & 0–2.32 & 1.30 \\
29 & 27.336 & 120-72-9 & indole & 7.59–21.82 & 15.37 a  & 0.92–9.99 & 3.33 b  \\
30 & 29.831 & 17699-14-8 & \(\alpha\)-cubebene & 5.25–7.48 & 6.30 & 3.97–8.72 & 6.51 \\
31 & 31.283 & 31501-11-8 & (Z)-3-hexenyl hexanoate & 20.89–83.72 & 53.38 a  & 20.78–49.87 & 30.48 b  \\
32 & 31.483 & 6378-65-0 & hexanoic acid, hexalcher ester & 29.76–11.08 & 7.17 a  & 2.15–37.76 & 3.29 b  \\
33 & 34.198 & 3879-26-3 & cis-garyanedione & 2.63–8.67 & 5.36 b  & 5.12–11.45 & 8.89 a  \\
34 & 35.522 & 14901-07-06 & trans-\(\beta\)-ionone & 5.90–10.97 & 8.55 & 2.93–12.81 & 7.44 \\
35 & 36.083 & 629-62-9 & pentadecane & 13.80–19.7 Figure 3: Various change trends of the aldehydes in XYMJ green teas. All data are expressed as mean \(\pm\) S.D. (\(n=3\)). Figure 2: Various change trends of the alcohols in XYMJ green teas. All data are expressed as mean \(\pm\) S.D. (\(n=3\)). (Z)-3-Hexenyl hexanoate was the highest in XYMJ green teas followed by methyl 2-methylpentanoate, methyl salicate, trans-3-hexenyl butyrate, cis-3-hexenyl-\(\alpha\)-methylbutyrate and hexanoic acid, hexyl ester (Figure 4). (Z)-3-Hexenyl hexanoate was identified to endow fresh and clean odor to green teas [26]. With a pleasant fruity aroma, the content of methyl 2-methylvalerate ranged from 9.68 \(\upmu\)g/L to 28.90 \(\upmu\)g/L in XYMJ green teas, which was also found in bead-shaped green tea [18].