## 4 Conclusions
\begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline \multirow{2}{*}{**No**} & \multirow{2}{*}{**Compounds**} & \multicolumn{2}{c}{**Threshold a**} & \multirow{2}{*}{**Source b**} & \multicolumn{5}{c}{**OAV c**} & \\ \cline{5-10}  & & & **(ug kg\({}^{-1}\))** & & & **JM** & **QM** & **GF** & **HY** & **TN** \\ \hline
1 & 1-Penten-3-one & 1.00 [35] & mango & 0 & 0.52 & 0 & 0.47 & 0.31 \\
2 & 2-Cyclohepten-1-one & 0.14 [35] & new & 0 & 0 & 0 & 4.71 & 0 \\
3 & 2-Penten-1-ol & 720.00 [23] & mango & \(<\)0.01 & 0 & 0 & \(<\)0.01 & \(<\)0.01 \\
4 & Hexanal & 4.50 [23] & mango & 1.10 & 0 & 0.29 & 16.79 & 0.40 \\
5 & Ethyl cyclopropancarboxylate & 0.12 [23] & new & 2.17 & 0 & 0 & 0 & 1.00 \\
6 & trans-2-Hexenal & 400.00 [23] & mango & 0.02 & 0.45 & 0.21 & 0.21 & 0.01 \\
7 & 3-hexenal & 550.00 [23] & mango & 0 & 0 & 0 & 0 & 0.08 \\
8 & 3-Hexen-1-ol, (E)- & 110.00 [23] & mango & 0.38 & 1.21 & 0.70 & 0 & 0 \\
9 & 1-Hexanol & 9.00 [26] & mango & 6.20 & 6.58 & 2.55 & 0.86 & 5.13 \\
10 & Heptanal & 1.00 [23] & mango & 0 & 0 & 0 & 1.65 & 1.83 \\
11 & \(\alpha\)-pinene & 6.00 [35] & mango & 0.68 & 0.29 & 0.32 & 0.17 & 1.23 \\
12 & trans-2-Heptanal & 13.00 [35] & mango & 0 & 0 & 0 & 5.05 & 0 \\
13 & Allo-cimene & 140.00 [35] & mango & 0 & 0.07 & 0.04 & 0.10 \\
14 & 6-pinene & 100.00 [23] & mango & 0 & 0 & 0 & \(<\)0.01 & 0 \\
15 & 3-methylcyclohex-3-en-1-one & 7.00 [36] & mango & 0 & 0.09 & 0 & 0 & 0 \\
16 & 6-Methyl-5-hepten-2-one & 50.00 [23] & mango & \(<\)0.01 & \(<\)0.01 & \(<\)0.01 & 0 \\
17 & \(\beta\)-Myrcene & 20.00 [23] & mango & 0.31 & 0.19 & 0.23 & 0.07 & 1.15 \\
18 & Ethyl butyrate & 0.75 [23] & mango & 1.56 & 0 & 0 & 0 & 2.40 \\
19 & 2-Carene & 4.00 [23] & mango & 0.40 & 0.17 & 0.14 & 0 & 1.11 \\
20 & \(\beta\)-Phellandrene & 7.00 [23] & mango & 2.41 & 1.55 & 1.00 & 0 & 4.31 \\
21 & 3-Carene & 50.00 [23] & mango & 2.07 & 1.21 & 0.87 & 0.55 & 1.42 \\
22 & \(\gamma\)-Cymene & 18.50 [23] & mango & 1.48 & 1.83 & 1.05 & 0.84 & 7.19 \\
23 & D-Limonene & 26.00 [23] & mango & 0.48 & 1.25 & 1.01 & 0.10 & 1.11 \\
24 & (E)-beta-ocimene & 6.70 [23] & mango & 0 & 1.04 & 0 & 1.36 \\
25 & \(\gamma\)-Terpinene & 2.00 [23] & mango & 7.72 & 3.37 & 3.04 & 0.55 & 10.44 \\
26 & Terpionelene & 140.00 [23] & mango & 1.05 & 0.42 & 0.31 & 0.18 & 5.80 \\
27 & 1-Nonanal & 0.15 [23] & mango & 0 & 9.73 & 6.07 & 56.20 & 5.73 \\
28 & 1,3,8-\(p\)-Menthartiene & 6.80 [23] & Lychepe & 1.75 & 0.56 & 0 & 2.00 & 2.41 \\
29 & (E,Z)-2,6-Nonadienal & 4.50 [23] & mango & 0.57 & 0 & 0 & 0.02 \\
30 & E-2-Nonneal & 50.00 [36] & mango & 0 & 0.15 & 0 & 0 & 0 \\
31 & Citral & 1.00 [23] & Lychepe & 0.18 & 0 & 0.09 & 1.23 & 0 \\
32 & Decanal & 6.00 [23] & mango & 0 & 1.41 & 1.41 & 0 & 2.08 \\
33 & \(\gamma\)-Octanoic & 7.00 [35] & mango & 2.66 & 0 & 2.36 & 3.76 & 0 \\ \hline \hline \end{tabular}  
* OT odor threshold in water (ppb) found in the newly determined and taken from the literature. b Source: It indicates substances found in the related literature for mangoes and litchis; New: first identified to be useful in aroma activity in mango. c An OAV was calculated by dividing the concentration of an odorant by its orthonasal odor threshold.  
\end{table} 
Table 3: Concentrations and calculations of odor activity values (OAVs) of the important aroma-active compounds in mango samples. aroma-active compounds of minty, citrus, green, floral, violet, coffee, cucumber-like 1-nonanal, 2-cyclohexpten-1-one, 1,3,8-\(p\)-menthatriene, hexanal, 2-cyclohexpten-1-one, and \(\gamma\)-octanoic were detected in HY. The predominant aroma-active compounds of resin, flower, green, citrus, lemon, cucumber-like 1-hexanol, \(\gamma\)-terpinene, \(\gamma\)-octanoic, \(\beta\)-phellandrene, and 1-nonanal were observed in GF. Light balsam, wood, sweet, rosin, citrus, minty, fruity, citrus, orange-like \(\beta\)-myrcene, 2-caren, \(\beta\)-phellandrene, 3-carene, \(p\)-cymene, d-limonene, \(\gamma\)-terpinene, terpinolene, 1,3,8-\(p\)-menthatriene, and decanal were the most important aromatic substances in HY. TN was significantly higher than HY in four other aromatic substances.