# Optimization of the Drying Temperature for High Quality Dried Melissa officinalis
## 3 Results
### Correlation Between Measured Parameters
\begin{table}
\begin{tabular}{l c c c c} \hline
**Compound** & **RI** & **20 \({}^{\circ}\)C** & **35 \({}^{\circ}\)C** & **42 \({}^{\circ}\)C** & **49 \({}^{\circ}\)C** \\ \hline
1-Octen-3-ol & 975 & 0.51 \(\pm\) 0.00 a & 0.00 \(\pm\) 0.00 b & 0.01 \(\pm\) 0.01 b & 0.00 \(\pm\) 0.00 b \\
5-Hepten-2-one,6-methyl & 983 & 0.22 \(\pm\) 0.01 b & 0.25 \(\pm\) 0.01 ab & 0.28 \(\pm\) 0.01 a & 0.00 \(\pm\) 0.00 c \\ \(\beta\) Myrcene & 989 & 0.06 \(\pm\) 0.00 a & 0.05 \(\pm\) 0.00 a & 0.04 \(\pm\) 0.00 b & 0.00 \(\pm\) 0.00 c \\ _trans_\(\beta\) Ocimene & 1046 & 0.11 \(\pm\) 0.00 a & 0.07 \(\pm\) 0.01 b & 0.07 \(\pm\) 0.00 b & 0.00 \(\pm\) 0.00 c \\ Bergamal & 1050 & 0.06 \(\pm\) 0.00 b & 0.06 \(\pm\) 0.01 b & 0.07 \(\pm\) 0.01 a & 0.00 \(\pm\) 0.00 c \\ Linalool & 1100 & 0.04 \(\pm\) 0.00 a & 0.01 \(\pm\) 0.01 b & 0.06 \(\pm\) 0.00 a & 0.00 \(\pm\) 0.00 b \\ _cis_ Rose oxide & 1109 & 0.02 \(\pm\) 0.00 b & 0.06 \(\pm\) 0.01 a & 0.02 \(\pm\) 0.02 b & 0.00 \(\pm\) 0.00 c \\ _exo_ Isocitral & 1142 & 0.04 \(\pm\) 0.00 a & 0.03 \(\pm\) 0.00 b & 0.03 \(\pm\) 0.00 b & 0.00 \(\pm\) 0.00 c \\ _neo_ Isopulegone & 1148 & 0.17 \(\pm\) 0.00 a & 0.08 \(\pm\) 0.01 c & 0.13 \(\pm\) 0.00 b & 0.00 \(\pm\) 0.00 d \\
**Citronellal** & **1153** & **33.32 \(\pm\) 0.08 a** & **27.51 \(\pm\) 0.10 c** & **17.86 \(\pm\) 0.09 d** & **31.33 \(\pm\) 0.08 b** \\ Z Isocitral & 1162 & 0.45 \(\pm\) 0.00 a & 0.46 \(\pm\) 0.02 a & 0.42 \(\pm\) 0.08 a & 0.06 \(\pm\) 0.01 b \\ Rosefuran epoxide & 1173 & 0.03 \(\pm\) 0.00 c & 0.07 \(\pm\) 0.01 b & 0.10 \(\pm\) 0.01 a & 0.00 \(\pm\) 0.00 d \\ E Isocitral & 1180 & 0.76 \(\pm\) 0.00 b & 0.90 \(\pm\) 0.02 a & 0.87 \(\pm\) 0.01 a & 0.44 \(\pm\) 0.01 c \\
**Neral** & **1242** & **23.26 \(\pm\) 0.03 c** & **25.63 \(\pm\) 0.04 b** & **29.66 \(\pm\) 0.01 a** & **23.07 \(\pm\) 0.10 c** \\ Carvone & 1244 & 0.61 \(\pm\) 0.01 a & 0.11 \(\pm\) 0.03 c & 0.67 \(\pm\) 0.01 a & 0.37 \(\pm\) 0.05 b \\ Methyl citronellate & 1259 & 0.98 \(\pm\) 0.02 a & 1.01 \(\pm\) 0.03 a & 0.44 \(\pm\) 0.01 b & 0.35 \(\pm\) 0.06 b \\
**Geranial** & **1271** & **36.30 \(\pm\) 0.00 d** & **39.18 \(\pm\) 0.08 b** & **45.23 \(\pm\) 0.05 a** & **38.47 \(\pm\) 0.13 c** \\ Thymol & 1292 & 0.01 \(\pm\) 0.00 d & 1.44 \(\pm\) 0.05 b & 0.94 \(\pm\) 0.01 c & 2.02 \(\pm\) 0.15 a \\ Methyl geranate & 1321 & 0.29 \(\pm\) 0.01 a & 0.24 \(\pm\) 0.02 b & 0.22 \(\pm\) 0.01 ab & 0.26 \(\pm\) 0.02 ab \\ _iso_ Dihydrocarveol acetate & 1326 & 0.10 \(\pm\) 0.00 b & 0.00 \(\pm\) 0.00 c & 0.00 \(\pm\) 0.00 c & 0.28 \(\pm\) 0.05 a \\ Geranyl acetate & 1381 & 0.23 \(\pm\) 0.01 c & 0.42 \(\pm\) 0.01 b & 0.49 \(\pm\) 0.01 a & 0.11 \(\pm\) 0.01 d \\ \(\beta\) Caryophyllene & 1425 & 1.95 \(\pm\) 0.02 a & 1.72 \(\pm\) 0.02 b & 1.35 \(\pm\) 0.01 c & 1.00 \(\pm\) 0.02 d \\ Caryophyllene oxide & 1587 & 0.75 \(\pm\) 0.02 b & 0.53 \(\pm\) 0.03 c & 0.84 \(\pm\) 0.02 a & 0.33 \(\pm\) 0.01 d \\ \hline Total identified & 99.37 \(\pm\) 0.03 & 99.45 \(\pm\) 0.02 & 99.38 \(\pm\) 0.01 & 98.25 \(\pm\) 0.52 \\ Monoterpenes hydrocarbons & 0.05 \(\pm\) 0.00 a & 0.05 \(\pm\) 0.00 a & 0.04 \(\pm\) 0.00 b & 0.00 \(\pm\) 0.00 c \\ Oxygenated monoterepenes & 93.07 \(\pm\) 0.03 b & 93.52 \(\pm\) 0.11 ab & 94.04 \(\pm\) 0.02 a & 93.79 \(\pm\) 0.26 a \\ Sesquiterpenes hydrocarbons & 1.96 \(\pm\) 0.01 a & 1.72 \(\pm\) 0.03 b & 1.35 \(\pm\) 0.00 c & 1.07 \(\pm\) 0.09 d \\ Oxygenated sesquiterpenes & 0.75 \(\pm\) 0.02 b & 0.53 \(\pm\) 0.03 c & 0.84 \(\pm\) 0.02 a & 0.33 \(\pm\) 0.01 d \\ Others & 4.02 \(\pm\) 0.02 a & 2.06 \(\pm\) 0.05 c & 3.01 \(\pm\) 0.01 b & 1.12 \(\pm\) 0.21 d \\ \hline \end{tabular} Values are expressed as means \(\pm\) standard (n = 3). Values in rows for each harvest followed by the same letter are not significantly different, \(p\leq\) 0.05.  
\end{table} 
Table 4: Effect of the drying temperature on the chemical composition (%) of essential oils of _M. officinalis_ plants (>0.05%).