## 3 Results and Discussion
### GC-IMS Analysis of Volatile Profile of Dried Citrus Peel as Effected by Drying Methods
#### 3.3.1 Aldehydes and Alcohols
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Compound** & **CAS** & **Formula** & **MW** & **RI** & **RT (s)** & **DT (ms)** & **Comment** \\ \hline Ketones & & & & & & \\ \hline
2-Hexanone & 591-78-6 & C\({}_{6}\)H\({}_{12}\)O & 100.2 & 786.1 & 286.633 & 1.1901 & Monomer \\
2-Hexanone & 591-78-6 & C\({}_{6}\)H\({}_{12}\)O & 100.2 & 787.2 & 287.739 & 1.5056 & Dimer \\
2-3-Pentadiene & 600-14-6 & C\({}_{5}\)H\({}_{5}\)O\({}_{2}\) & 100.1 & 660.2 & 180.929 & 1.2261 & \\ Acetophenone & 986-22 & C\({}_{8}\)H\({}_{5}\)O & 120.2 & 1067.6 & 756.873 & 1.191 & \\ Cyclohexanone & 108-94-1 & C\({}_{6}\)H\({}_{10}\)O & 98.1 & 897.6 & 429.786 & 1.1484 & \\
6-Methyl1-5-hepten-2-one & 110-93-0 & C\({}_{8}\)H\({}_{14}\)O & 126.2 & 990.1 & 618.121 & 1.173 & \\ \hline Monoterpenes & & & & & & \\ \hline \(\alpha\)-Terpinene & 99-86-5 & C\({}_{10}\)H\({}_{16}\) & 136.2 & 1017.4 & 670.467 & 1.2204 & Monomer \\ \(\alpha\)-Terpinene & 99-86-5 & C\({}_{10}\)H\({}_{16}\) & 136.2 & 1017.4 & 671.183 & 1.7217 & Dimer \\ \(\alpha\)-Pinene & 80-56-8 & C\({}_{10}\)H\({}_{16}\) & 136.2 & 942 & 516.604 & 1.217 & Monomer \\ \(\alpha\)-Pinene & 80-56-8 & C\({}_{10}\)H\({}_{16}\) & 136.2 & 940 & 512.312 & 1.2954 & Polymer \\ \(\alpha\)-Pinene & 80-56-8 & C\({}_{10}\)H\({}_{16}\) & 136.2 & 938.3 & 508.735 & 1.6688 & Polymer \\ \(\alpha\)-Pinene & 80-56-8 & C\({}_{10}\)H\({}_{16}\) & 136.2 & 936.5 & 505.158 & 1.7341 & Polymer \\ D-Limonene & 5989-27-5 & C\({}_{10}\)H\({}_{16}\) & 136.2 & 1040.8 & 712.473 & 1.2165 & Monomer \\ D-Limonene & 5989-27-5 & C\({}_{10}\)H\({}_{16}\) & 136.2 & 1038.9 & 709.238 & 1.2987 & Polymer \\ \(\beta\)-Ccomene & 13877-91-3 & C\({}_{10}\)H\({}_{16}\) & 136.2 & 1057.2 & 739.969 & 1.2143 & Monomer \\ \(\beta\)-Ocimene & 13877-91-3 & C\({}_{10}\)H\({}_{16}\) & 136.2 & 1057.7 & 740.777 & 1.6943 & Dimer \\ \hline Acids & & & & & & \\ \hline Propionic acid & 79-09-4 & C\({}_{3}\)H\({}_{6}\)O\({}_{2}\) & 74.1 & 704.6 & 209.337 & 1.1119 & \\ Nonanoic acid & 112-05-0 & C\({}_{9}\)H\({}_{18}\)O\({}_{2}\) & 158.2 & 1279.5 & 1090.406 & 1.5442 & \\
2-Methylbutanoic acid & 116-53-0 & C\({}_{5}\)H\({}_{10}\)O\({}_{2}\) & 102.1 & 890.7 & 417.914 & 1.2097 & Monomer \\
2-Methylbutanoic acid & 116-53-0 & C\({}_{5}\)H\({}_{10}\)O\({}_{2}\) & 102.1 & 890.7 & 417.914 & 1.4764 & Dimer \\ \hline Others & & & & & & \\ \hline Dially disulfide & 2179-57-9 & C\({}_{6}\)H\({}_{10}\)S\({}_{2}\) & 146.3 & 1090.7 & 793.377 & 1.1873 & \\ Dimethyl trisulfide & 3658-80-8 & C\({}_{2}\)H\({}_{6}\)S\({}_{9}\) & 126.3 & 978.3 & 959.635 & 1.2952 & \\ Butyl sulfide & 5444-40-1 & C\({}_{5}\)H\({}_{5}\)S\({}_{15}\) & 146.3 & 1085.6 & 785.453 & 1.3011 & \\
2-Acetylfuran & 1192-62-7 & C\({}_{6}\)H\({}_{6}\)O\({}_{2}\) & 110.1 & 909.8 & 452.045 & 1.1171 & \\
2-Ethyl-5-methylpyrazine & 13360-64-0 & C\({}_{7}\)H\({}_{10}\)N\({}_{2}\) & 122.2 & 1002.1 & 642.196 & 1.1768 & \\ Styrene & 100-42-5 & C\({}_{8}\)H\({}_{8}\) & 104.2 & 904.6 & 442.242 & 1.0594 & \\
4-Ethylphenol & 123-07-9 & C\({}_{8}\)H\({}_{10}\)O & 122.2 & 1198.2 & 962.542 & 1.1888 & \\
2,4-Dichloro-phenol & 120-83-2 & C\({}_{6}\)H\({}_{4}\)Cl\({}_{2}\)O & 163 & 1140.7 & 872.045 & 1.1901 & \\ \hline \end{tabular}
\end{table} 
Table 3: _Cont._