Abstract
The composition of the volatile components from Rosa damascena Mill. was investigated using comprehensive two-dimensional gas chromatography with time of flight mass spectrometry (TOF/MS). The samples were collected from Turkey and were extracted by water distillation (WD), superheated water extraction (SWE) and direct thermal desorption (DTD). It was found that superheated water extraction gave a slightly higher oil yield than water distillation. The major compounds found in volatiles of R. damascena Mill. were linalool, phenylethylalcohol, citronellol, nerol and geraniol. Phenylethylalcohol content was significantly higher using the DTD (36.52%) and SWE (38.14%) techniques compared to the WD (1.92%) technique. A lower content of monoterpene alcohols was found in volatiles extracted using the DTD method (73.69%) compared to the SWE (86.51%) and WD (86.56%) techniques reflecting the main finding that DTD extracts showed a greater total number of different components than either of the other two methods. The number of volatile components identified with a percentage higher than 0.05% were 54, 37, and 34 for the DTD, SWE and WD techniques, respectively. This highlighted DTD as a promising method for qualitative analysis of rose oil which can yield comprehensive results without the traditional obligation for costly and time consuming extraction techniques.
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