## 3 Results and Discussion
### GC-MS Analysis and Identification Results of the Processed RFIS
\begin{table}
\begin{tabular}{c c c} \hline
**Aldehydes (8) (540.95 \(\pm\) 88.29) \({}^{3}\) (1798.73 \(\pm\) 520.43) \({}^{4}\)** & **Ketones (6) (13.45 \(\pm\) 3.08) \({}^{3}\) (63.72 \(\pm\) 31.73) \({}^{4}\)** \\ \hline
3-Methylhiotoponal (918.00 \(\pm\) 273.18) \({}^{1}\) & \\
5-Methyl-2-furanarboxarboxarboxarbox (241.21 \(\pm\) 101.43) \({}^{2}\) & 2-3-Butanedine (15.68 \(\pm\) 2.50) \({}^{2}\) \\ Decanal (538.87 \(\pm\) 73.84) & 1-(Ethy(thio)-2)propanonate (16.40 \(\pm\) 14.24) \({}^{2}\) \\ Benzaldehyde (0.00 \(\pm\) 0.00) & 2-Hydroxy-3-methyl-2-cyclopent-1-one \({}^{*}\) (0.00 \(\pm\) 0.00) \({}^{2}\) \\
3-Methylbenzamidealdehyde (0.00 \(\pm\) 0.00) \({}^{2}\) & 6-10-Dimethyl-5.9-autochemical-2-one \({}^{*}\) (0.00 \(\pm\) 0.00) \({}^{2}\) \\ Octant (0.00 \(\pm\) 0.00) & 4-(2-Harmany)-3-buten-2-one \({}^{*}\) (0.00 \(\pm\) 0.00) \({}^{2}\) \\ Nonanal (86.6 \(\pm\) 63.90) & 1-(1H-pyrrol-2-aryl)-ethanane \({}^{*}\) (31.64 \(\pm\) 14.93) \({}^{2}\) \\
1-Methyl-1H-pyrrol-2-carboxaldehyde (25.02 \(\pm\) 8.06) \({}^{2}\) & \\ \hline
**S-Containing compounds (6) (63.434.18 \(\pm\) 16.00 \({}^{3}\) (626.53 \(\pm\) 289.70) \({}^{4}\)** & **N-Containing compounds (6) (0.00 \(\pm\) 0.00) \({}^{3}\) (10.20 \(\pm\) 5.52) \({}^{4}\)** \\ \hline Methanethetheth (50.76 \(\pm\) 9.90) & 2-5-Dimethylpyrazine (0.00 \(\pm\) 0.00) \({}^{2}\) \\ Dimethyl disulfide (248.27 \(\pm\) 250.69) & 2-6-Dimethylpyrazine (0.00 \(\pm\) 0.00) \({}^{2}\) \\ Dimethyl disulfide (26.28 \(\pm\) 22.09) & 2-Ethyd-6-methylpyrazine (0.00 \(\pm\) 0.00) \({}^{2}\) \\ (Methylhihiolycopenthene (21.24 \(\pm\) 7.12) & Trimethyl)pyrazine (10.20 \(\pm\) 5.52) \({}^{2}\) \\ Trimethylthio disulfide (0.00 \(\pm\) 0.00) & 3-Alpha/3-to-6-methyl-2H-PYani (0.00 \(\pm\) 0.00) \({}^{2}\) \\ Methylhiolycydhene (0.00 \(\pm\) 0.00) \({}^{2}\) & 3-Ethly-2-5-dimethylpyrazine (0.00 \(\pm\) 0.00) \({}^{2}\) \\ \hline
**Furans (6) (212.95 \(\pm\) 20.38) \({}^{3}\) (660.73 \(\pm\) 142.43) \({}^{4}\)** & **Alcohol (3) (7) (76.60 \(\pm\) 10.83) \({}^{3}\) (04.01 \(\pm\) 16.72) \({}^{4}\) and Esters (2) (6) (20.20 \(\pm\) 10.20) \({}^{3}\) (126.38 \(\pm\) 71.50) \({}^{4}\)** \\ \hline Dhybro-2-methyl-3(2H)-furanance (0.00 \(\pm\) 0.00) \({}^{2}\) & 2-Furanmethanon (0.00 \(\pm\) 0.00), \\ Parallel (52.04 \(\pm\) 11.96) & 2-Furanmethanon (0.00 \(\pm\) 0.00), \\
2-(Methylhiolyc)-1(methyl-1)/furan (0.00 \(\pm\) 0.00), & 2-Furanmethanon (0.00 \(\pm\) 0.00), \\
2-Methyl-5-[methylthio]-phenylfuran (10.08 \(\pm\) 0.00) \({}^{2}\) & 2-Furanmethanon (0.00 \(\pm\) 0.00), \\
2-(2-methylfuran)-[22.27 \(\pm\) 2.73) \({}^{2}\) & 2-Furanmethanon (0.00 \(\pm\) 0. Figure 3: The amounts of classified volatile compounds detected in reaction flavor solution induced with precursor compounds. In the aldehyde group, 3-methylhiopropanol, which has a baked potato-like odor, was the most abundant compound detected. This compound had a low threshold of 0.2 ppb [38], suggesting that it was the dominant odor component of RFIS in this experiment. Next, 5-methyl-2-furancarboxaldehyde (threshold: 6 ppb, [PERSON] et al. [39], which has a baked or caramelized odor, was detected in a large amount. Decanal (green-like, fruity) and nonanal (green-like, fruity, [PERSON] et al. [40]) followed. In the S-containing compounds group, the content of dimethyl disulfide (threshold: 12 ppb, [PERSON] et al. [40]), which has a cooked cabbage or crab meat-like odor, was dominant. The next highest contents were dimethyl trisulfide (threshold: 0.01 ppb, [PERSON] et al. [40]) and methanethiol (threshold: 2.21 ppb, [PERSON] et al. [41]) having a cooked cabbage odor. These compounds were thought to be the dominant odor components of RFIS because they have very low thresholds. On the other hand, in the furans group, furural (threshold: 282 ppb, [PERSON] et al. [42]), which has sweet and almond-like odors, was the most abundant compound detected. The next highest contents were 2-methyl-5-[(methylthio) methyl]furan and 2,4-dimethylfuran. At the N-containing compound group, only trimethylhyrazine (threshold: 23 ppb, [PERSON] et al.