Document Detail

Extraction of essential oils from Algerian myrtle leaves using instant controlled pressure drop technology.
MedLine Citation:
PMID:  20813373     Owner:  NLM     Status:  MEDLINE    
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.
Baya Berka-Zougali; Aicha Hassani; Colette Besombes; Karim Allaf
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Publication Detail:
Type:  Journal Article     Date:  2010-08-11
Journal Detail:
Title:  Journal of chromatography. A     Volume:  1217     ISSN:  1873-3778     ISO Abbreviation:  J Chromatogr A     Publication Date:  2010 Oct 
Date Detail:
Created Date:  2010-09-20     Completed Date:  2010-12-20     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9318488     Medline TA:  J Chromatogr A     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  6134-42     Citation Subset:  IM    
Copyright Information:
Copyright © 2010 Elsevier B.V. All rights reserved.
University of La Rochelle; Transfer Phenomena and Instantaneity in Agro-industry and Building-Pole Science and Technology, Avenue Michel Crepeau, 17042 La Rochelle cedex 01, France.
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MeSH Terms
Analysis of Variance
Distillation / methods*
Gas Chromatography-Mass Spectrometry
Microscopy, Electron, Scanning
Myrtus / chemistry*
Oils, Volatile / chemistry,  isolation & purification*
Plant Leaves / chemistry
Reg. No./Substance:
0/Oils, Volatile; 0/Terpenes

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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