Abstract
The composition of essential oil is affected by different drying methods. The present study aimed to evaluate the effect of drying methods (shade-drying (SD), oven-drying(OD), and freeze-drying (FD)) on the essential oils composition of Salvia rosmarinusat. The extracted S. rosmarinusessential oil samples subjected to different drying methods were extracted by hydrodistillation and analyzed by gas chromatography-mass spectrometry (GC-MS). Eighty-three compounds were tentatively identified, with 1,8-cineole, ?-pinene, ?-fenchene, and bornyl being the major components. The shade-dried method best maintained the composition of rosemary essential oil and showed the best retention of ?-Pinene, 1,8-Cineole, the most important compounds, as well as ?-terpineol and safranal. The oven-dried method displayed the worst results, with a significant loss of 37 compounds. However, oven-drying produces a significant increase in the concentrations of borneol, iso-menthol, ?-terpineol, camphor, and bornyl acetate.
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