## 2 Results
### The Effect of Gamma Irradiation on Volatile Compounds of Non-Irradiated and Irradiated Rice  
Table 1 shows all volatile compounds identified from the irradiated rice and the non-irradiated rice (germination time of 24 h). Thirty-four volatile compounds were obtained from the non-irradiated rice (0 Gy), and the same amount were also obtained from the irradiated rice treated with 20 Gy and 40 Gy. For other gamma doses, 33 volatile compounds were obtained from the irradiated rice treated with 60 Gy and 80 Gy, respectively. Thirty-one volatile compounds were recorded in the irradiated rice treated with 100 Gy, 150 Gy and 200 Gy. Thirty and 28 volatile compounds were recorded in the irradiated rice treated with 250 Gy and 300 Gy, respectively. Among the detected compounds, the characteristic fragrant rice compound 2 AP was identified in both the irradiated and non-irradiated rice. Other aroma compounds were also identified in all of the gamma doses (including of 0 Gy), such as Hexanal, Undecane, Dodecane, 2-Pentylfuran, Octanal, Tridecane, (\(Z\))-2-Heptnal, Nonanal, Tetradecane, 3-Octen-2-one, 1-Octen-3-ol, Benzaldehyde, Octylformate, \(n\)-Nonylcyclohexane, 2-Butyl-2-ocrenal, Undecane, Methyl \(N\)-hydroxybenzenecarboximidate, 2-Ethyl-3-hydroxyhexyl 2-methylpropanoate, Benzyl alcohol and 2,3-Dihydrobenzofuran. Furthermore, some volatile compounds were identified in some gamma doses of irradiated rice. 1-Butyl-2-pentyl-cyclopentane, 1-Hexanol, Isobutyl ridecyl carbonate, Cyclotetradecane and 3-Methyl-Pentadecanwere only recorded in the rice treated with 60 Gy. Hexyl butanoate and Nonanoic acid were identified in the rice treated with 80 Gy. Only \(n\)-Hexadecanoic acid and 5-Methyl-2-hexanone were identified in the rice treated with 100 Gy and 300 Gy, respectively. \begin{table}
\begin{tabular}{c c c c c c c c c c c c} \hline \hline
**RT (min)** & **Volatile Compounds** & **0 (Gy)** & **20 (Gy)** & **40 (Gy)** & **60 (Gy)** & **80 (Gy)** & **100 (Gy)** & **150 (Gy)** & **200 (Gy)** & **250 (Gy)** & **300 (Gy)** \\ \hline
21.62 & Hexanal & + & + & + & + & + & + & + & + & + \\
22.37 & Undacane & + & + & + & + & + & + & + & + & + & + \\
27.58 & 5-Methyl-2-hexanone & – & – & – & – & – & – & – & – & – & + \\
27.64 & Herpanal & – & – & – & + & – & + & + & + & + & + \\
28.52 & Dodecane & + & + & + & + & + & + & + & + & + \\
29.56 & butyl butanoate & – & – & – & – & – & + & + & – & – \\
30.17 & 2-Pethylfuran & + & + & + & + & + & + & + & + & + \\
33.13 & Octanal & + & + & + & + & + & + & + & + & + & + \\
33.74 & Tridecane & + & + & + & + & + & + & + & + & + & + \\
34.20 & 1-Butyl-2-pernly-cyclopentane & – & – & – & + & – & – & – & – & – \\
34.84 & (Z)-2-Hepptal & + & + & + & + & + & + & + & + & + & + \\
35.57 & 2-Acotyl-1-pyrroline & + & + & + & + & + & + & + & + & + \\
35.73 & Cyclododecane & – & – & – & + & – & – & – & – & + \\
36.43 & 1-Hexanol & – & – & + & – & – & – & – & – & – \\
37.99 & Heptylydohexane & – & – & – & + & – & – & + & + & + \\
38.16 & Nonanal & + & + & + & + & + & + & + & + & + \\
38.30 & Tetradecane & + & + & + & + & + & + & + & + & + \\
38.83 & 3-Octen-2-one & + & + & + & + & + & + & + & + & + \\
39.18 & Hexyl butanoate & – & – & – & – & + & – & – & – & – \\
39.79 & 8-MethylMethyloctumarin & + & + & + & - & + & + & + & – & + \\
40.31 & \(n\)-Pendendadecan & + & + & + & + & + & + & + & + & + \\
40.75 & 1-Octen-3-ol & + & + & + & + & + & + & + & + & + \\
41.06 & 2-Ethyl-1-decanol & – & – & – & + & + & + & + & + & - & – \\
41.07 & Isobutyl triidexyl carbonate & – & – & – & + & – & – & – & – & – \\
41.08 & 2-Butocytly acetate & + & + & + & – & – & – & – & – & – \\
42.57 & 1-Hexadecol & + & + & + & + & + & + & + & + & + \\
42.58 & Cyclodetradecane & – & – & – + & – & – & – & – & – \\
42.76 & 4-(1-Acetyl-cyclopentyl)-but-3-en-2-one & + & + & + & – & – & – & – & – \\
43.87 & Benzaldehyde & + & + & + & + & + & + & + & + & + \\ \hline \hline \end{tabular}
\end{table}