Thread: Baking soda enfleurage
Last edited by Pears; 8th July 2014 at 10:36 AM.
An inert powder such as talc, or cellulose would be the best option. There is a method for extracting fragrances from solids that uses this technique. It is called a Soxhlet extractor.
Indeed, a soxhlet would ordinarily work well for this purpose. For aroma compounds that are less heat stable, you'd need to use a more volatile solvent in the soxhlet, which would require a tighter control on the temperature, in order to control the pressure. It could certainly be done, although it's probably not one for your every day perfumer. Then again, neither are some of the extraction methods that I've mentioned in the past, but it's fun to discuss the possibilities.
Last edited by Pears; 8th July 2014 at 04:14 PM.
Thank you David for chiming in It's fun to discuss! During my time in the lab, powders were the bane of my existance oh, how much I hated to work with them!
You have not only the inhalation problems, but that body powders need to be very finely grinded, thus they get through every creek of the work space, clothes etc.
The best solution was using a box that looks like a sterile glove box
I still have one for powdered aromachems.
You're both correct, ofcourse, it just depends on your perspective. We're not just talking about absorption but adsorption, which involves intermolecular forces at the surface. There's no need for the aroma compounds to become dissolved in the water for them to become adsorbed at the surface.
Last edited by Pears; 8th July 2014 at 11:46 PM.
But in this case one would have to look upon each molecule released by a plant in head space and calculate the possibilities.
From the top of my head this is what actually happens when extracting the scent by using headspace technology. Adsorbent materials are also used but I would need to look up what and how. It's a speciality on its own. Anyone owning a book by Roman Kaiser?
p.s. google books to the rescue
Last edited by Irina; 9th July 2014 at 08:05 AM.
I own "The Scent of Orchids" by Roman Kaiser. He describes, in not great detail, the process of Headspace analysis. He mentions an "adsorption trap" but does not describe it clearly. I gather he uses activated charcoal. The amounts of fragrance collected is minute; 1-300 micro grammes. Often two solvents are used to remove the collected samples; a non polar solvent such as Carbon Disulphide, and a polar solvent such as Ethanol.
Poropak is a polymer used for the collection of VOCs for later analysis using thermal desorption and GC analysis.
One of these days I'll actually get to try out Kaiser's technique with something, I have two Pocket Pumps:
Gold Medal for "Best Aroma"; Los Angeles Artisan Fragrance Salon
The actual sampling is dead easy; I've done it myself so it must be!! The analysis is another matter.
Last edited by Pears; 10th July 2014 at 05:34 PM.
Indeed David, that's what I read too: minuscule particles of activated charcoal. And some other synthetic solvents and polymers.
Thank you, Pears, I see what you mean.
Your combined chemical knowledge is a wonderful thing to see unfurling here. I am reading with utter fascination.
You are assuming that all Aromachemicals are non-polar; this is just not true.
Last edited by Pears; 12th July 2014 at 11:42 AM.
Last edited by Pears; 11th July 2014 at 05:07 PM.
You are right Pears. As Sir Mick once opined, "What a drag it is getting old".
I know the feeling, David. Although to be fair, you can't be expected to remember every little detail, especially if your old reference books neglect to mention it. It would rarely be of much use to a perfumer, anyhow.
Last edited by Pears; 12th July 2014 at 11:51 AM.
Oh mumsy, what are you like.