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astragulus extraction

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Could someone explain what a soxhlet extraction is?

This was in regards to extracting astragalus

Gilbert Arnold wrote:

 

>2) Take marc and do a soxhlet extraction with a 100 % ethyl alcohol; watch

>for precipitates; if some, add abit of glycerine to help " hold " phyto's in

>solution.

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I found a picture of a soxhlet at

http://www.lab-glass.com/html/nf/EXTA-LG-6900.html. I have no commercial

interest in that firm.

 

A good explanation can be found in Junius's handbook of plant alchemy. However,

plant material is placed in a thimble which is placed in the soxhlet reflux

chamber . The solvent is placed in the flask and heated to a vapour. It rises

through a tube, hits the condenser liquifies, falls in the chamber with the

thimble and rise until it hits the level of the reflux tube. The liquid along

with the extract then ends up in the flask and the process continues.

 

Gilbert

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