Solvent-free microwave extraction of essential oil from aromatic herbs: comparison with conventional hydro-distillation

Solvent-free microwave extraction (SFME) is a combination of microwave heating and dry distillation, performed at atmospheric pressure without added any solvent or water. Isolation and concentration of volatile compounds are performed by a single stage. SFME has been compared with a conventional tec...

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Bibliographic Details
Published in:Journal of Chromatography A 2004-07, Vol.1043 (2), p.323-327
Main Authors: Lucchesi, Marie E, Chemat, Farid, Smadja, Jacqueline
Format: Article
Language:English
Subjects:
Analysis
Analytical biochemistry: general aspects, technics, instrumentation
Analytical chemistry
Analytical, structural and metabolic biochemistry
Applied sciences
Aromatic herbs
Biological and medical sciences
Chemical industry and chemicals
Chemistry
Chromatographic methods and physical methods associated with chromatography
Costs and Cost Analysis
Essential oils
Essential oils, perfumes
Exact sciences and technology
Fundamental and applied biological sciences. Psychology
General pharmacology
Green chemistry
Hydro-distillation
Medical sciences
Mentha - chemistry
Microwave extraction
Microwaves
Oils, Volatile - isolation & purification
Pharmacology. Drug treatments
Solvents - chemistry
Thymus Plant - chemistry
Washing products. Cosmetics and toiletries. Perfumes
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Summary:Solvent-free microwave extraction (SFME) is a combination of microwave heating and dry distillation, performed at atmospheric pressure without added any solvent or water. Isolation and concentration of volatile compounds are performed by a single stage. SFME has been compared with a conventional technique, hydro-distillation (HD), for the extraction of essential oil from three aromatic herbs: basil ( Ocimum basilicum L.), garden mint ( Mentha crispa L.), and thyme ( Thymus vulgaris L.). The essential oils extracted by SFME for 30 min were quantitatively (yield) and qualitatively (aromatic profile) similar to those obtained by conventional hydro-distillation for 4.5 h. The SFME method yields an essential oil with higher amounts of more valuable oxygenated compounds, and allows substantial savings of costs, in terms of time, energy and plant material. SFME is a green technology and appears as a good alternative for the extraction of essential oils from aromatic plants.
ISSN:0021-9673
DOI:10.1016/j.chroma.2004.05.083