## 2 Results and Discussion
### Volatile Compounds Identified in Doubanjiang
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**No.**} & \multicolumn{2}{c}{**RI \({}^{\textbf{a}}\)**} & \multirow{2}{*}{**Compounds \({}^{\textbf{b}}\)**} & \multirow{2}{*}{**Odor Description \({}^{\textbf{c}}\)**} & \multirow{2}{*}{**Identification \({}^{\textbf{d}}\)**} \\ \cline{2-2} \cline{5-6}  & **DB-Sms** & & & & \\ \hline
20 & 1850 & 2153 & ethyl pentadecanoate \({}^{1}\) & - & MS, RI \\
21 & 1989 & \(>\)2200 & ethyl palmitate \({}^{1}\) & Wax & MS, RI \\
22 & & \(<\)1000 & isopropyl acetate \({}^{2}\) & - & MS, RI \\
23 & - & \(>\)2200 & ethyl 9-hexadecenate \({}^{1}\) & - & MS, RI \\
24 & - & \(>\)2200 & ethyl oleate \({}^{1}\) & - & MS, RI \\
25 & - & \(>\)2200 & methyl palmitate \({}^{1}\) & - & MS, RI \\
26 & - & \(>\)2200 & methyl linoleate \({}^{1}\) & - & MS, RI \\ \hline \multicolumn{6}{c}{_Hydrocarbons (30)_} \\
27 & \(<\)800 & 1045 & toluene \({}^{1}\) & glue, paint, solvent & MS, RI \\
28 & 1029 & 1193 & limonene \({}^{3}\) & balsamic, fragrant, fruit & MS, RI, Std, O \\
29 & 1085 & - & teripolence \({}^{2}\) & pine, plastic, sweet & MS, RI \\
30 & 1199 & 1772 & naphthalene \({}^{1}\) & mothball, tar & MS, RI \\
31 & 1237 & - & 4-methylcyclopentene \({}^{2}\) & - & MS, RI \\
32 & 1363 & - & 2-methylridecane \({}^{3}\) & - & MS, RI \\
33 & 1375 & - & ylangene \({}^{2}\) & fruit & MS, RI \\
34 & 1381 & - & copenene \({}^{2}\) & spice, wood & MS, RI \\
35 & 1386 & - & Ionigicyclene \({}^{2}\) & - & MS, RI \\
36 & 1391 & - & \(\beta\)-elemen \({}^{2}\) & - & MS, RI \\
37 & 1434 & - & zingbierene \({}^{2}\) & fresh, mint, sharp, spice & MS, RI \\
38 & 1447 & - & thujopsene \({}^{2}\) & - & MS, RI \\
39 & 1463 & - & 2-methyltetradecane \({}^{1}\) & - & MS, RI \\
40 & 1471 & - & \(\alpha\)-himachane \({}^{3}\) & - & MS, RI \\
41 & 1475 & - & cyclododecane \({}^{1}\) & - & MS, RI \\
42 & 1479 & - & \(\alpha\)-seline \({}^{2}\) & wood & MS, RI \\
43 & 1498 & - & eerenphilene \({}^{2}\) & wood & MS, RI \\
44 & 1501 & 1723 & \(\alpha\)-muurolene \({}^{1}\) & wood & MS, RI \\
45 & 1509 & 1736 & valence \({}^{1}\) & citrus, green, oil, wood & MS, RI \\
46 & 1519 & - & \(\gamma\)-cadineme \({}^{2}\) & wood & MS, RI \\
47 & 1526 & - & calamenene \({}^{2}\) & clove, floral, herb, spice & MS, RI \\
48 & 1548 & - & \(\alpha\)-calacorene \({}^{2}\) & wood & MS, RI \\
49 & 1564 & - & 2-methylpentadecane \({}^{3}\) & - & MS, RI \\
50 & 1612 & \(>\)2200 & fluorene \({}^{1}\) & - & MS, RI \\
51 & 1660 & - & 2-methylhexadecane \({}^{1}\) & - & MS, RI \\
52 & 1677 & - & cadalene \({}^{2}\) & - & MS, RI \\
53 & 1700 & - & heptadecane \({}^{1}\) & alkane, biting, pungent & MS, RI \\
54 & 1731 & - & guaiazuelene \({}^{1}\) & - & MS, RI \\
55 & - & 1268 & styrene \({}^{1}\) & balsamic, rubber, solvent & MS, RI \\
56 & - & 1743 & \(\beta\)-selinene \({}^{3}\) & herb & MS, RI \\ \hline \multicolumn{6}{c}{_Alcohols (27)_} \\
57 & \(<\)800 & 1583 & 2,3-butanediol \({}^{3}\) & - & MS, RI \\
58 & \(<\)800 & 1209 & 3-methyl-1-butanol \({}^{3}\) & banana, cocoa, floral & MS, RI \\
59 & 872 & 1356 & hexanol \({}^{3}\) & Green, grassy, fatty, leafy & MS, RI \\
60 & 907 & 1410 & 2-butoxyethanol \({}^{1}\) & - & MS, RI \\
61 & 971 & 1458 & 1-heptanol \({}^{1}\) & nutty & MS, RI \\
62 & 1029 & 1492 & 2-ethyl-1-hexanol \({}^{3}\) & citrus, green, oil, rose & MS, RI \\
63 & 1042 & 1896 & benzyl alcohol \({}^{3}\) & floral, roasted bread & MS, RI \\
64 & 1101 & 1551 & linanol \({}^{3}\) & bergamot, lavender, rose & MS, RI, Std, O \\
65 & 1120 & 1933 & phenylethyl alcohol \({}^{3}\) & fruit, rose, sweet apple & MS, RI, Std, O \\
66 & 1183 & 1616 & terpinen-4-ol \({}^{3}\) & earth, must, wood & MS, RI \\
67 & 1204 & 1709 & \(\alpha\)-teripenol \({}^{1}\) & fresh, mint, oil, sweet & MS, RI \\
68 & 1249 & - & citromello \({}^{1}\) & citrus, green, rose & MS, RI \\
69 & 1260 & 2004 & 2-phenylbutane-1-ol \({}^{1}\) & - & MS, RI \\
70 & 1565 & 2043 & nerold \({}^{1}\) & fir, linoleum, pine & MS, RI \\
71 & 1624 & - & cedrol \({}^{2}\) & sweet & MS, RI \\
72 & - & 1097 & 2-methyl-1-propanol \({}^{2}\) & apple, cocoa, fusel, malt & MS, RI \\
73 & - & 1253 & pentanol \({}^{1}\) & unpleasant & MS, RI \\
74 & - & 1316 & 4-methyl-1-pentanol \({}^{3}\) & - & MS, RI \\
75 & - & 1389 & 3-hexen-1-ol \({}^{3}\) & bell pepper, grass, herb & MS, RI \\
76 & - & 1391 & cis-3-hexen-1-ol \({}^{2}\) & bell pepper, grass, herb & MS, RI \\
77 & - & 1395 & 3-octanol \({}^{3}\) & citrus, mushroom, oil & MS, RI \\ \hline \hline \end{tabular}
\end{table}