Title of article :
Extraction of essential oils from Algerian myrtle leaves using instant controlled pressure drop technology
Author/Authors :
Berka-Zougali، نويسنده , , Baya and Hassani، نويسنده , , Aicha and Besombes، نويسنده , , Colette and Allaf، نويسنده , , Karim، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2010
Pages :
9
From page :
6134
To page :
6142
Abstract :
In the present work, the new extraction process of Détente Instantanée Contrôlée DIC (French, for instant controlled pressure drop) was studied, developed, quantitatively and qualitatively compared to the conventional hydrodistillation method for the extraction of essential oils from Algerian myrtle leaves. DIC was used as a thermomechanical treatment, DIC subjecting the product to a high-pressure saturated steam. The DIC cycle ends with an abrupt pressure drop towards vacuum, and this instantly leads to an autovaporization of myrtle volatile compounds. An immediate condensation in the vacuum tank produced a micro-emulsion of water and essential oils. Thus, an ultra-rapid cooling of residual leaves occurred, precluding any thermal degradation. An experimental protocol was designed with 3 independent variables: saturated steam pressure between 0.1 and 0.6 MPa, resulting in a temperature between 100 and 160 °C, a total thermal processing time between 19 and 221 s, and between 2 and 6 DIC cycles. The essential oils yield was defined as the main dependent variable. This direct extraction gave high yields and high quality essential oil, as revealed by composition and antioxidant activity (results not shown). After this treatment, the myrtle leaves were recovered and hydrodistilled in order to quantify the essential oil content in residual DIC-treated samples. Scanning electron microscope (SEM) showed some modification of the structure with a slight destruction of cell walls after DIC treatment.
Keywords :
antioxidant , Essential oil , Myrtus Communis L. , Instant controlled pressure drop DIC , hydrodistillation
Journal title :
Journal of Chromatography A
Serial Year :
2010
Journal title :
Journal of Chromatography A
Record number :
1513400
Link To Document :
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