Lab-scale extraction of essential oils from Tunisian lemongrass (Cymbopogon flexuosus)

[Display omitted] •A very important medicinal value of essential oils extracted from lemongrass.•Quantity and purity are improved by optimization of ultrasound pretreatment.•Time, power and temperature have a more or less significant effect on extraction yield. The present study is conducted to inve...

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Bibliographic Details
Published in:Chemical engineering and processing 2018-02, Vol.124, p.164-173
Main Authors: Balti, Mohamed Amine, Hadrich, Bilel, Kriaa, Karim, Kechaou, Nabil
Format: Article
Language:English
Subjects:
Drying
Essential oils
Hydro-distillation
Lemongrass (Cymbopogon flexuosus)
Ultrasound
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Summary:[Display omitted] •A very important medicinal value of essential oils extracted from lemongrass.•Quantity and purity are improved by optimization of ultrasound pretreatment.•Time, power and temperature have a more or less significant effect on extraction yield. The present study is conducted to investigate the effect(s) of ultrasonic pretreatment on the extraction of essential oils from dried leaves of lemongrass (Cymbopogon flexuosus) by hydro-distillation. The drying process was carried out within a forced convective dryer at 50 °C and a drying air velocity of 1 m/s. Using a response surface methodology (RSM) based on central composite design with the face centered, the obtained optimum conditions were as follows: an ultrasound pretreatment for 25 min within a power of 250 W, at 50 °C. Modeling showed that all factors (time, power and temperature) were found to be highly significant in the extraction process (p 
ISSN:0255-2701
1873-3204
DOI:10.1016/j.cep.2017.12.012