CO2 extraction method:
A relatively new method of extracting essential oils,
particularly for the food industry. The theraputic properties of these
oils are still being assesed. CO2 extracted oils are said to resemble
those of solvent extracted oils (absolutes).
Susan, here are two references to CO2.
Penoel & Franchomme:
It is one of the most modern methods of extraction, but also the most expensive. It consist of passing a current of CO2 through the vegetable mass, which, by increasing the pressure, bursts the pouches of essence and carries off the aromatic substances. Diverse studies tend to prove that this process respects integrally the original essence.
Shirley Price:
The technology calls for very expensive equipement, (millions of pounds worth),
which uses carbon dioxide at very high pressures and extremely low temperatures. With this method, more top notes, fewer terpenes, a higher proportion of esters, plus larger molecules, are obtained. The resultant oil is said to be more like the essential oil in the plant, as many terpenes in a distilled oil seem to form during the distillation process, which also breaks down some of the acetates (esters) in the plant material.
CO2 extracted essential oils are pure and stable, colorless and have no residue
of CO2 left in them - they should be excellent theraputically, although this needs to be verified for each oil on account of their different compositions. At the moment the price is high; perhaps after a number of years, when the equipment has paid for itself...the prices will be lower.
This method is not suitable for all oils; there are still a few practical
difficulties to overcome (sometimes an emulsion is produced), but I am tempted to try them!
Hannibal
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