## 3 Results
### Retronasal Aroma Release Profiles of NCS
\begin{table}
\begin{tabular}{c c c c c} \hline \hline
**No** & **RI 1** & **Compound** & **120 \({}^{\circ}\)C** & **130 \({}^{\circ}\)C** & **140 \({}^{\circ}\)C** \\ \hline
25 & 1499 & 2-Acetylfuran & 0.07 \(\pm\) 0.02 b & 0.56 \(\pm\) 0.06 b & 3.80 \(\pm\) 0.48 a \\
26 & 1517 & Benzaldehyde & 0.07 \(\pm\) 0.01 c & 0.13 \(\pm\) 0.01 b & 0.15 \(\pm\) 0.01 a \\
27 & 1534 & 2-Furanmenthol acetate & nd & tr & 0.06 \(\pm\) 0.01 \\
28 & 1540 & [R-(R\({}^{*}\),R\({}^{*}\))]-2,3-Butanediol & 0.11 \(\pm\) 0.01 a & 0.07 \(\pm\) 0.01 b & 0.04 \(\pm\) 0.01 c \\
29 & 1568 & 5-Methyl-2-furanaldehyde & 0.03 \(\pm\) 0.01 b & 0.24 \(\pm\) 0.05 b & 1.19 \(\pm\) 0.23 a \\
30 & 1577 & [S-(R\({}^{*}\),R\({}^{*}\))]-2,3-Butanediol & 0.25 \(\pm\) 0.03 a & 0.25 \(\pm\) 0.01 a & 0.34 \(\pm\) 0.07 a \\
31 & 1598 & 2-Acetylpyridine & tr & 0.04 \(\pm\) 0.01 b & 0.14 \(\pm\) 0.01 a \\
32 & 1620 & Dihydro-2(3H)-furanone; butylolactone & 0.02 \(\pm\) 0.01 c & 0.13 \(\pm\) 0.02 b & 0.62 \(\pm\) 0.07 a \\
33 & 1635 & Benzenacetaldehyde & 0.22 \(\pm\) 0.03 a & 0.19 \(\pm\) 0.03 a & 0.11 \(\pm\) 0.02 b \\
34 & 1659 & 2-Furanmethanol & 0.52 \(\pm\) 0.08 b & 1.49 \(\pm\) 0.12 b & 5.98 \(\pm\) 0.66 a \\
35 & 1687 & 2-Acetylyl-5 methylpyrazine & nd & 0.07 \(\pm\) 0.02 b & 0.24 \(\pm\) 0.03 a \\
36 & 1712 & Pyrazimamide & nd & 0.06 \(\pm\) 0.02 b & 0.28 \(\pm\) 0.02 a \\
37 & 1721 & 5-Methyl-2-furanmethanol & 0.08 \(\pm\) 0.01 c & 0.35 \(\pm\) 0.06 b & 0.97 \(\pm\) 0.06 a \\
38 & 1746 & 2(5H)-Furanone & 0.03 \(\pm\) 0.01 c & 0.07 \(\pm\) 0.01 b & 0.16 \(\pm\) 0.02 a \\
39 & 1838 & 2-Ethenylbenzofuran & nd & 0.04 \(\pm\) 0.01 b & 0.07 \(\pm\) 0.01 a \\
40 & 1849 & 3-Phenylfuran & tr & 0.10 \(\pm\) 0.01 b & 0.24 \(\pm\) 0.01 a \\
41 & 1926 & 2-Phenyl-2-butenal & nd & 0.03 \(\pm\) 0.01 b & 0.11 \(\pm\) 0.01 a \\
42 & 1968 & 2-Acetylpyrrole & 0.11 \(\pm\) 0.01 c & 0.68 \(\pm\) 0.07 b & 2.35 \(\pm\) 0.15 a \\
43 & 2001 & 2-(Hydroxyacetyl)furan & 0.05 \(\pm\) 0.01 b & 0.05 \(\pm\) 0.02 b & 0.23 \(\pm\) 0.08 a \\
44 & 2033 & 2,5-Dimethylfuran-3,4(2H,5H)-dione & nd & 0.12 \(\pm\) 0.02 b & 0.62 \(\pm\) 0.10 a \\
45 & \textgreater{}2100 & 2-Metboxy-4-vinylphenol & 0.13 \(\pm\) 0.02 b & 0.12 \(\pm\) 0.03 b & 0.39 \(\pm\) 0.09 a \\
46 & \textgreater{}2100 & 2,3-Dihydro-3,5-dihydroxy-6-methyl-4H-pyran-4-one & 0.68 \(\pm\) 0.16 b & 4.54 \(\pm\) 0.96 b & 21.05 \(\pm\) 4.17 a \\
47 & \textgreater{}2100 & 5-Hydroymethylfurfurral & nd & 0.10 \(\pm\) 0.04 b & 1.24 \(\pm\) 0.50 a \\  & Component groups & & & & \\  & Aldehyde (8 compounds) & 0.99 \(\pm\) 0.12 b & 2.10 \(\pm\) 0.19 a & 2.77 \(\pm\) 0.42 a \\  & Alcohol (3 compounds) & 0.49 \(\pm\) 0.06 b & 0.44 \(\pm\) 0.04 b & 0.77 \(\pm\) 0.15 a \\  & Ketone (3 compounds) & 0.17 \(\pm\) 0.03 c & 0.32 \(\pm\) 0.02 b & 0.67 \(\pm\) 0.04 a \\  & Carbohydrate acid (1 compound) & 1.42 \(\pm\) 0.13 c & 2.76 \(\pm\) 0.23 b & 6.43 \(\pm\) 0.48 a \\  & Pyrazine (15 compounds) & 5.16 \(\pm\) 0.69 c & 13.82 \(\pm\) 0.54 b & 22.63 \(\pm\) 1.84 a \\  & Furan (11 compounds) & 1.27 \(\pm\) 0.21 b & 5.87 \(\pm\) 0.74 b & 28.36 \(\pm\) 4.36 a \\  & Furanone (3 compounds) & 0.08 \(\pm\) 0.03 c & 0.30 \(\pm\) 0.38 b & 1.12 \(\pm\) 0.12 a \\  & Pyridine (1 compound) & nd & 0.04 \(\pm\) 0.02 b & 0.14 \(\pm\) 0.01 a \\  & Pyrrole (1 compound) & 0.11 \(\pm\) 0.01 c & 0.68 \(\pm\) 0.07 b & 2.35 \(\pm\) 0.15 a \\  & Pyanone (1 compound) & 0.68 \(\pm\) 0.16 b & 4.54 \(\pm\) 0.96 b & 21.05 \(\pm\) 4.17 a \\  & Total & 10.37 \(\pm\) 1.27 c & 30.87 \(\pm\) 2.75 b & 86.29 \(\pm\) 7.17 a \\ \hline \hline \end{tabular}  
* Retention index relative to \(n\)-alkanes on a polar DB-Wax column. 2 Each value is expressed as the mean \(\pm\) standard deviation of three replicates; tr = trace (\(<\)0.01 ug/100 g); nd = not detected. Means in the same row followed by the same letter are not significantly different at \(p\) \(<\) 0.05.  
\end{table}