Journal
FOOD CHEMISTRY
Volume 150, Issue -, Pages 193-198Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2013.10.139
Keywords
Green extraction; Solvent-free microwave extraction; Scaling-up; Essential oil; Rosemary; Pilot scale
Funding
- European Union (FEDER)
- French and Italian governments
- Piemont region as well as ADEME
- Conseil Regional Provence-Alpes-Cotes d'Azur through the Etat-Region-ADEME framework programme
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Solvent-free microwave extraction (SFME) has been proposed as a green method for the extraction of essential oil from aromatic herbs that are extensively used in the food industry. This technique is a combination of microwave heating and dry distillation performed at atmospheric pressure without any added solvent or water. The isolation and concentration of volatile compounds is performed in a single stage. In this work, SFME and a conventional technique, hydro-distillation HD (Clevenger apparatus), are used for the extraction of essential oil from rosemary (Rosmarinus officinalis L) and are compared. This preliminary laboratory study shows that essential oils extracted by SFME in 30 min were quantitatively (yield and kinetics profile) and qualitatively (aromatic profile) similar to those obtained using conventional hydro-distillation in 2 h. Experiments performed in a 75 L pilot microwave reactor prove the feasibility of SFME up scaling and potential industrial applications. (C) 2013 Elsevier Ltd. All rights reserved.
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