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Chemical composition and antibacterial activity of dracocephalum kotschyi essential oil obtained by microwave extraction and hydrodistillation
, Article International Journal of Food Properties ; Volume 20 , 2017 , Pages S306-S315 ; 10942912 (ISSN) ; Mirzania, F ; Sonboli, A ; Matloubi Moghaddam, F ; Sharif University of Technology
Abstract
Dracocephalum kotschyi essential oils obtained by hydrodistillation (HD), microwave-assisted hydrodistillation (MAHD), and solvent-free microwave extraction (SFME) were investigated by GC-FID (Gas Chromatography-Flame Ionization Detector) and GC-MS (Gas Chromatography-Mass Spectrometry). The percentage of oxygenated compounds was significantly increased from 62.52% in HD to 76.47% in MAHD, and 84.52% in SFME. Conversely, the monoterpene hydrocarbons were decreased from 30.84% in HD to 13.71% in MAHD, and 5.85% in SFME. The main compound in the essential oil obtained by HD is limonene, which accounted for more than 30% of the oil, while the percentage of this compound was reduced to 9.52% in...