## 2 Results and Discussion
### Organic Volatiles Isolated by USE
\begin{table}
\begin{tabular}{c l c c c c c c c c} \hline \hline  & & & & \multicolumn{6}{c}{**Area percentages (\%)**} \\ \cline{4-11}
**No.** & **Compound** & **RI** & \multicolumn{4}{c}{**Solvent A**} & \multicolumn{4}{c}{**Solvent B**} \\ \cline{4-11}  & & & **Min.** & **Max.** & **Av.** & **SD.** & **Min.** & **Max.** & **Av.** & **SD.** \\ \hline
1. & 3-Methylbutanoic acid & \(<900\) & **-** & **-** & **-** & **-** & 0.0 & 0.1 & 0.07 & 0.06 \\
2. & 1,3-Dimethylbenzene\({}^{**}\) & \(<900\) & **-** & **-** & **-** & **-** & 0.0 & 0.1 & 0.07 & 0.06 \\
3. & Nonane & 900 & 0.1 & 0.8 & 0.33 & 0.32 & - & - & - & - \\
4. & 3-Methylpentanoic acid & 941 & 0.0 & 1.1 & 0.35 & 0.51 & 0.0 & 0.2 & 0.10 & 0.10 \\
5. & Benzaldehyde & 965 & 0.0 & 0.3 & 0.15 & 0.13 & 0.0 & 0.2 & 0.13 & 0.12 \\
6. & Benzyl alcohol & 1037 & 0.0 & 0.2 & 0.08 & 0.10 & 0.0 & 0.1 & 0.07 & 0.06 \\
7. & Pantoic lactone & 1044 & - & - & - & - & 0.0 & 0.1 & 0.07 & 0.06 \\
8. & Phenylacetaldehyde & 1048 & 0.0 & 0.4 & 0.18 & 0.17 & 0.0 & 0.1 & 0.05 & 0.06 \\
9. & 4,5-Dimethyl-2- & & 1078 & 0.1 & 0.5 & 0.25 & 0.19 & 0.1 & 0.6 & 0.30 & 0.22 \\  & formylfuran & & & & & & & & & \\
10. & Methyl 2-fluoroate & 1084 & 0.1 & 0.3 & 0.18 & 0.10 & 0.2 & 0.7 & 0.45 & 0.24 \\
11. & 4-Ketoisophorone & 1152 & 0.2 & 1.9 & 0.98 & 0.85 & 0.1 & 0.6 & 0.40 & 0.25 \\
12. & Benzoic acid & 1181 & 2.5 & 4.9 & 3.65 & 1.10 & 0.3 & 0.8 & 0.58 & 0.21 \\  & (_E_)-3,7-dimethylocta- & & & & & & & & & \\
13. & 1,5-diene-3,7-diol & 1191 & 0.1 & 0.2 & 0.13 & 0.05 & 0.0 & 0.2 & 0.10 & 0.10 \\  & (Terpenediol I) & & & & & & & & & \\
14. & 2,3-dihydrobenzofuran & & & & & & & & \\ (coumaran) & 1245 & 0.0 & 0.7 & 0.25 & 0.33 & - & - & - & - \\
15. & 5-Hydroymethylfurral & 1251 & 1.0 & 2.6 & 2.13 & 0.75 & 1.0 & 5.0 & 3.33 & 1.70 \\  & 4-Methoxybenzaldehyde & & & & & & & & & \\
16. & (4-Anisaldehyde) & 1262 & 1.0 & 1.9 & 1.53 & 0.38 & 0.1 & 0.3 & 0.23 & 0.10 \\
17. & Phenylacetic acid & 1283 & 0.8 & 1.4 & 1.10 & 0.26 & 0.1 & 0.2 & 0.15 & 0.06 \\  & 4-Methoxybenzyl & 1292 & 0.0 & 0.3 & 0.15 & 0.13 & - & - & - \\  & alcohol & 1-Methoxy-4- & & & & & & & & \\
19. & 1-Methoxy-4- & & & & & & & & & \\  & propylbenzene & 1307 & 0.0 & 1.6 & 0.88 & 0.80 & 0.0 & 0.4 & 0.20 & 0.16 \\  & 4-Hydroxy-3,5,5- & & & & & & & & & \\  & trimethyl-cyclohexan-1- & & 1320 & 0.3 & 0.6 & 0.45 & 0.13 & 0.0 & 0.1 & 0.07 & 0.06 \\  & one-2-ene (4-Hydroxy-a- & & & & & & & & & \\ isophorone) & & & & & & & & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 2: _Prunus mahaleb_ L. honey volatile organic composition obtained by USE with two solvents followed by GC and GC-MS analysis. Since fresh honey samples were analyzed, only a few furan derivatives were found (Table 2): panotic lactone (-; 0.0-0.1%), 4,5-dimethyl-2-formylfuran (0.1%-0.5%; 0.1%-0.6%) and methyl 2-furoate (0.1%-0.3%; 0.2%-0.7%). Higher aliphatic acids and alcohols were also represented, including hexadecan-1-ol (0.0%-0.5%; 0.5%-1.4%), hexadecanoic acid (1.0%-1.6%; 0.3%-1.1%), (\(Z\))-octadec-9-en-1-ol (1.5%-5.5%; 1.0%-2.7%), (\(Z\))-octadec-9-enoic acid (1.2%-3.2%; 0.5%-0.8%), octadecanoic acid (0.0%-0.6%; 0.0%-0.2%). Two high-molecular saturated hydrocarbons were found: heneicosane (0.0%-2.9%; 0.0%-0.2%) and tricosane (0.5%-1.8%; 0.1%-0.2%).