# Chemical Composition of Volatile and Extractive Components of Canary (Tenerife) Propolis
## 2 Results
### Composition of Volatile Components of Propolis
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline  & & & & \multicolumn{3}{c}{**Sample**} \\ \cline{4-6}
**Monoterpene/Monoterpenoids, Including:** & \multirow{2}{*}{\(\mathbf{RI}^{Exp}\)} & \multirow{2}{*}{\(\mathbf{RI}^{Lit}\)} & **Pr-1** & **Pr-2** & **Pr-3** \\ \cline{4-6}  & & & **27.07** & **55.84** & **38.10** \\ \hline
2-nonanone & 1092 & 1089 & N.d. & 0.95 & N.d. \\ \hline nonanal & 1103 & 1104 & 6.34 & 3.17 & 1.91 \\ \hline
2,6-(\(E\),\(Z\))-nonadienal & 1153 & 1156 & N.d. & 0.38 & N.d. \\ \hline decanal & 1208 & 1207 & 2.11 & 0.63 & N.d. \\ \hline (\(E\))-2-decenal & 1261 & 1261 & N.d. & 0.40 & N.d. \\ \hline
2-undecanone & 1296 & 1294 & N.d. & 0.66 & N.d. \\ \hline undecanal & 1309 & 1308 & 0.02 & N.d. & N.d. \\ \hline
**Aromatics, including:** & & & **7.38** & **3.99** & **6.61** \\ \hline toluene & 761 & 761 & 2.80 & 0.37 & 1.03 \\ \hline \(p\)-xylene & 865 & 866 & N.d. & N.d. & 0.16 \\ \hline styrene & 894 & 893 & N.d. & 2.65 & N.d. \\ \hline benzaldehyde & 964 & 960 & 0.11 & 0.46 & N.d. \\ \hline \(p\)-xymene & 1022 & 1023 & 4.44 & 0.52 & 2.14 \\ \hline \(m\)-cymen-8-ol & 1181 & 1184 & 0.02 & N.d. & N.d. \\ \hline
**\(p\)-**xymen-8-ol & 1184 & 1187 & 0.14 & N.d. & 0.28 \\ \hline
**Alkane \& alkene, including:** & & & **6.00** & **9.33** & **32.48** \\ \hline \(n\)-hexane & 600 & 600 & 4.30 & N.d. & 1.50 \\ \hline \(n\)-heptane & 700 & 700 & 1.39 & 0.18 & 0.68 \\ \hline
1-octene & 790 & 791 & 0.31 & N.d. & 0.30 \\ \hline \(n\)-octane & 800 & 800 & N.d. & N.d. & 0.54 \\ \hline \(n\)-nonane & 900 & 900 & trace & trace & 0.12 \\ \hline
2-methylmonane & 962 & 962 & N.d. & N.d. & 0.13 \\ \hline \(n\)-decane & 1000 & 1000 & N.d. & trace & 6.03 \\ \hline
4-methyldecane & 1060 & 1060 & N.d. & 0.40 & 0.25 \\ \hline
2-methyldecane & 1063 & 1063 & N.d. & 0.18 & 1.55 \\ \hline
3-methyldecane & 1070 & 1070 & N.d. & N.d. & 0.48 \\ \hline \(n\)-undecane & 1100 & 1100 & N.d. & 0.45 & 2.05 \\ \hline
2,6-dimethyldecane & 1109 & 1109 & N.d. & 0.63 & N.d. \\ \hline
2,9-dimethyldecane & 1127 & 1126 & N.d. & N.d. & 0.13 \\ \hline
6-methylundecane & 1163 & 1062 & N.d. & N.d. & 0.61 \\ \hline
1-dodecene & 1190 & 1193 & N.d. & N.d. & 0.22 \\ \hline \(n\)-dodecane & 1200 & 1200 & N.d. & 0.98 & 11.85 \\ \hline
4-methyldodecane & 1260 & 1259 & N.d. & N.d. & 0.15 \\ \hline
2-methyldodecane & 1263 & 1263 & N.d. & N.d. & 0.77 \\ \hline \(n\)-tridecane & 1300 & 1300 & N.d. & N.d. & 0.78 \\ \hline \(n\)-tetradcane & 1400 & 1400 & N.d. & trace & 2.28 \\ \hline \(n\)-pentadecane & 1500 & 150 & N.d. & 1.64 & 0.32 \\ \hline \(n\)-heptadecane & 1600 & 1600 & N.d. & N.d. & 0.50 \\ \hline \hline \end{tabular}
\end{table} 
Table 1: _Cont._The second largest group of VOCs was formed by C\({}_{6}\)-C\({}_{17}\) alkanes and alkenes, the contribution of which to the TIC chromatograms varied greatly and ranged from 6% to 32%. It is interesting that even-numbered homologs predominated in terms of their contribution to the TIC. The VOCs contained 17 aliphatic carbonyl compounds, the proportion of which ranged from 7% to 20% of the TIC. The largest amounts were acetone, nonanal and heptanal. In addition, the fugitive emissions contained C\({}_{2}\)-C\({}_{8}\) aliphatic alcohols and C\({}_{1}\)-C\({}_{6}\) acids, as well as seven esters. However, the latter were found in only one of the samples (Pr-1). Of the seven aromatic compounds, toluene and \(p\)-cymene were present in the highest amounts in all three samples.