Comparison of super critical fluid extraction and hydrodistillation methods on lavander's essential oil composition and yield

Lavender's essential oil is commonly used in aromatherapy and massage. Its major clinical benefits are on the central nervous system. Linalyl acetate and linalool are the most predominant chemical constituents in the essential oil of Lavandula angustifolia Comparison of super critical fluid extraction [SCFE] and hydrodistillation [HD] methods on Lavander?s essential oil composition and yield methods In this work we extracted essential oil of this plant with two different methods; SCFE and HD and further analyzed by GC and GC-MS method. seventeen compounds were identified in the oil which prepared by HD, the major components of them were j. pinene [35.9%] and lavandulyl acetate [14.1%]. In the SCFE extracted sample, the most frequent components were linalyl acetate [73.5%] and lavandulyl acetate [7.5%]. According to obvious difference in the composition of the essential oils prepared by two different methods [SCFE and HD], it seems that extraction method differ chemical composition of the oil and probably affects pharmacological properties

[Study of the process of essential oil extraction from rosemary plant by using steam distillation method]

Rosemary [Rosemarinus officinialis L.] is an aromatic, medicinal and condiment plant that belongs to the family labiatae, reaching a height of 1.5 meter. Essential oil of rosemary, known as rosemary oil, is extracted by hydrodistillation method from the fresh leaves and twigs. The yield ranges from 0.5 to 1.5% [w/w]. Improving the total yields, determining minimum steam to be passed through the packed bed, evaluating influence of used multi-stage column and trend to change into important component with time of distillation are the aims of this work. In this work, essential oil was extracted from rosemary plant by steam distillation method. For the extraction of essential oil by this method rosemary was exposed to the steam flow. The processes were done and the extraction yield was calculated. Then, the components of the essential oils analyzed by GC-MASS and GC instruments. Experiments that were conducted in multi-stage columns and decreased steam flow rate proved that an increase in the number of stages has a considerable effect upon the yield. Also analyses which were done on essential oils components during 5, 15, 30, 60 and 100 minutes intervals showed different extraction phenomena for three major components of the oil; a-pinene, 1, 8- cineol and camphor. This study showed a direct correlation between increase of contact time of steam and increase of the yield. Also barrier effect of cell wall and boiling point of components affect extraction phenomena of them