Abstract
Microwave-assisted hydro distillation (MAHD) protocol, applied optimal extraction condition (650 W, 35 min) was used to extract an essential oil from the aerial part of Echinophora platylabo DC, which was collected from the Binaloud Mountain- Nishapor city. To evaluate the effect of microwave energy on the yield and composition of essential oil, MAHD method results were compared to those obtained by conventional hydro distillation (HD). The volatile compounds obtained by both methods were analyzed by Gas chromatography (GC) and GC-MS. It was indicated that, the yield of extracted essential oil using MAHD method is about 40% higher than regular HD method. In addition, the use of microwave irradiation not only influence the composition of the essential oil and the quantity of major compounds (trans-β- ocimene and γ –decalactone) but the extraction time in comparison to the HD method is shorter (35 min compared to 3 hours in HD). It was found that MAHD method is a good alternative for the extraction of essential oil in terms of the quality of the essential oil cost of the operation and saving energy. Thus we suggest that MAHD method can be considered as a green technology. Key words: Microwave, essential oil, E-β- ocimene and γ–decalactone, Echinophora platyloba DC.
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