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. 2018 Jun;55(6):2197-2207.
doi: 10.1007/s13197-018-3137-7. Epub 2018 Mar 24.

Optimization of microwave assisted extraction of essential oils from Iranian Rosmarinus officinalis L. using RSM

Maryam Akhbari  1 , Saeed Masoum  2 , Fahimeh Aghababaei  1 , Sepideh Hamedi  3
Affiliations

Optimization of microwave assisted extraction of essential oils from Iranian Rosmarinus officinalis L. using RSM

Maryam Akhbari et al. J Food Sci Technol. 2018 Jun.

Abstract

In this study, the efficiencies of conventional hydro-distillation and novel microwave hydro-distillation methods in extraction of essential oil from Rosemary officinalis leaves have been compared. In order to attain the best yield and also highest quality of the essential oil in the microwave assisted method, the optimal values of operating parameters such as extraction time, microwave irradiation power and water volume to plant mass ratio were investigated using central composite design under response surface methodology. Optimal conditions for obtaining the maximum extraction yield in the microwave assisted method were predicted as follows: extraction time of 85 min, microwave power of 888 W, and water volume to plant mass ratio of 0.5 ml/g. The extraction yield at these predicted conditions was computed as 0.7756%. The qualities of the obtained essential oils under designed experiments were optimized based on total contents of four major compounds (α-pinene, 1,8-cineole, camphor and verbenone) which determined by gas chromatography equipped with mass spectroscopy (GC-MS). The highest essential oil quality (55.87%) was obtained at extraction time of 68 min; microwave irradiation power of 700 W; and water volume to plant mass ratio of zero.

Keywords: Central composite design; Gas chromatography–mass spectroscopy; Quality assessment of essential oil; Response surface methodology; Rosemary officinalis L..

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Conflict of interest statement

Compliance with ethical standardsThe authors declare that they have no competing interests.

Figures

Fig. 1
Fig. 1
Three-dimensional response surface and the two-dimensional contour plots for extraction yield of essential oil as a function of a extraction time and microwave power; b extraction time and water volume to mass of plant ratio; c microwave power and water volume to mass of plant ratio
Fig. 2
Fig. 2
Three-dimensional response surface and two-dimensional contour plots for essential oil quality (total percentage of four major components of α-pinene, verbenone, 1,8-cineole and camphor) as a function of a extraction time and microwave power; b extraction time and water volume to mass of plant ratio; c microwave power and water volume to mass of plant ratio
See this image and copyright information in PMC

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