Analysis of essential oil of Zhumeria majdae extracted by SFE
Traditional methods for isolating essential oils from plant materials, such as steam distillation and solvent extraction have some draw backs due to the heat instability of essential oil and the presence of residual organic solvent in the extract. Thus, the use of super critical fluid extractions (SFE) for extraction of essential oils has received increasing attention to this traditional techniques [1, 2]. An experimental flow-type apparatus has been designed for the extraction of the essential oil from Zhumeria majdae (Lamiaceae) with super critical carbon dioxide. In the present study, the operating conditions for extraction were conducted at the pressure of 200bar, the temperature of 37°C, the carbon dioxide rate of 0.3 liter per min, the dynamic extraction time of 20min with different static times of 30, 45 and 60min. Main compounds were found to be linalool (73.8, 72.5, 41.5%, respectively) after analysis by GC/MS with a HP5-MS column. In comparison with other samples obtained by hydro distillation, SFE oil (static times of 30, 45min) contains higher amount of linalool.
References: 1. Mchugh M A., Krukonis V J. (1986) Supercritical Fluid Extraction Principles and Practice, Butter Worths, Boston, MA.
2. Goodarznia I, Esmaeilzadeh F. (2002)J. Chem. Eng. Data 47:333.