## 3 Results and Discussion
### Comparison of the Key Odorants in RZT Screened by OAV and GC-O
\begin{table}
\begin{tabular}{l l l l l} \hline \hline
**No.** & **TR (min) d** & **Aroma Compounds** & **Odor Descriptors** & **AI e** & **IM f** \\ \hline
1 & 7.72–8.01 & Hexanal & Grass, leafy & 2.67 & MS 8, RI h, A i, O j \\
2 & 9.63–9.77 & 3-Hexen-1-ol & Green, grassy & 1.33 & MS, RI, A, O \\
3 & 10.45–10.57 & 2-Hepatnone & Cheese, coconut & 2.25 & MS, RI, A \\
4 & 10.80–11.23 & Heptanal & Fresh, green & 2.80 & MS, RI, A, O \\
5 & 11.50–11.97 & Hexanoic acid, methyl ester & Fruity, sweet & 2.25 & MS, RI, A, O \\
6 & 13.45–13.78 & 1-Octen-3-ol & Green, metallic & 2.25 & MS, RI, A, O \\
7 & 13.75–14.07 & 2-Pentyl-furan & Fruity, green & 3.00 & MS, RI, A, O \\
8 & 14.32–14.57 & Octanal & Aldhydic, waxy & 3.50 & MS, RI, A, O \\
9 & 15.04–15.15 & 2-Ethyl-1-hexanol & Sweet, herbal, green & 1.50 & MS, RI, A, O \\
10 & 16.19–16.29 & (E)-\(\beta\)-Ocimene & Sweet, floral & 2.00 & MS, RI, A, O \\
11 & 16.95–17.23 & 3,5-Octaiden-2-one & Fruity, green & 2.00 & MS, RI, A, O \\
12 & 17.46–17.83 & (E)-Linalool oxide (furanoid) & Floral, coffee, baked & 2.67 & MS, RI, A \\
13 & 17.53–18.14 & Linalool & Floral, sweet & 3.67 & MS, RI, A, O \\
14 & 17.89–18.14 & Nonanal & Waxy aldehyde & 3.50 & MS, RI, A, O \\
15 & 18.89–19.12 & Phenethyl alcohol & Sweet, floral & 2.50 & MS, RI, A, O \\
16 & 19.85–20.13 & (Z)-3-Nonen-1-ol & Mushroom, green, spicy & 3.00 & MS, RI, A, O \\
17 & 20.49–20.72 & (E)-Linalool oxide (pyranoid) & Fresh, woody & 3.17 & MS, RI, A \\
18 & 21.41–21.45 & Methyl salicate & Wintergreen, minty & 2.00 & MS, RI, A, O \\
19 & 22.12–22.46 & \(\beta\)-Cyclocitral & Fresh, clean, citrus & 1.50 & MS, RI, A, O \\
20 & 22.38–22.99 & (Z)-3-Hexenyl 2-methylbutanoate & Green, apple, sweet & 2.00 & MS, RI, A \\
21 & 23.28–23.49 & Geraniol & floral, sweet & 2.33 & MS, RI, A, O \\
22 & 23.93–24.09 & Citral & Sweet, citrus, fruity & 2.00 & MS, RI, A, O \\
23 & 25.34–25.56 & Indole & Floral, sweet, plastic & 2.75 & MS, RI, A, O \\
24 & 26.50–26.66 & \(\alpha\)-Cubebene & herbal & 2.00 & MS, RI, A, O \\
25 & 26.79–27.05 & (Z)-3-Hexenyl hexanoate & Citrus, fruity, & 2.60 & MS, RI, A, O \\
26 & 27.44–27.76 & Hexanoic acid, hexyl ester & Fruity, green, sweet & 2.60 & MS, RI, A, O \\
27 & 28.04–28.38 & (Z)-Jasmone & Floral, sour, sweet & 2.33 & MS, RI, A, O \\
28 & 28.85–29.04 & \(\alpha\)-Ionone & Floral, violet & 1.75 & MS, RI, A, O \\
29 & 29.25–29.75 & Geranylacetone & Magnolia, sweet & 2.00 & MS, RI, A, O \\
30 & 29.98–30.29 & 1-Dodecanol & Fatty, waxy, sweet & 3.00 & MS, RI, A \\
31 & 30.51–30.79 & (E)-\(\beta\)-Ionone & Floral, orris & 3.40 & MS, RI, A, O \\
32 & 31.06–31.53 & Unknown 1 & coconut & 3.40 & - \\
33 & 31.87–32.25 & Dihydroactinidiolide & Floral, sweet, fresh & 2.50 & MS, RI, A, O \\
34 & 34.46–34.70 & (-)-Torreyol & Fresh, sweet, herbal & 1.25 & MS, RI, A \\
35 & 35.33–35.61 & \(\alpha\)-Cadinol & Herbal. green, mild sweet & 1.67 & MS, RI, A \\
36 & 35.83–36.11 & Methyl jasmonate & Floral, sweet, milk & 2.25 & MS, RI, A, O \\
37 & 37.11–37.43 & Unknown 2 & Floral & 2.75 & - \\ \hline \hline \end{tabular}  
\({}^{\text{d}}\): time range. e: aroma intensity. f: identification method (IM). f: mass spectrum (MS), compared with the Nist library. b: retention index (RI), compared with the RI in the published literature and an online library ([[https://webbook.nist.gov/chemistry/cas-ser.html](https://webbook.nist.gov/chemistry/cas-ser.html)]([https://webbook.nist.gov/chemistry/cas-ser.html](https://webbook.nist.gov/chemistry/cas-ser.html)), accessed on 5 July 2024). i: aroma descriptors (A). i: (O) odor of the authentic standard.  
\end{table} 
Table 2: Key odorants in RZT identified by GC-O analysis. Despite minor discrepancies between the outcomes of GC-O and OAV analysis, the synergistic application of these two methodologies offers a more holistic portrayal of the aromatic profile of RZT. As depicted in Figure 5a, OAV and GC-O identified 25 and 37 key odorants, respectively, while the two groups mentioned above shared 17 common odorants.