![]() ![]() This prevents solid components from being carried along, allowing for the desired separation of compounds. First, a porous plug that won’t dissolve in the solvent (usually sterile cotton fiber) is placed at the bottom of the thimble. The way a Soxhlet extraction works is quite ingenious. ), as we walk you through the extraction process. Please reference the figure below, and follow along with our bolded, bracketed numbers (i.e. Although many solvent choices are possible, ethanol’s strong ability to extract cannabinoids and terpenes, combined with its tolerability and safety for consumption, make it an ideal solvent for the microbrew Soxhlet extraction. While originally developed for dairy farmers, the technique von Soxhlet developed is used most ubiquitously today in the extraction of compounds from solid products, such as cannabis. 1 Interest fact: the “Py” in Pyrex comes from “apple pie”-the first Pyrex product! A picture of a Pyrex Soxhlet extractor from the early 20 th century, courtesy of the Smithsonian Museum of American History, is shown below. The apparatus was further refined with the invention of Pyrex, a borosilicate-based glass matrix, which created tougher, more resilient laboratory equipment. He worked in the dairy industry, and originally developed the procedure (and glassware) as a means to separate cream (milk fat) from curds (solid protein formations). The Soxhlet apparatus was developed in the 1870’s by German chemist Franz Ritter von Soxhlet (1848–1926). In this case, the solvent of choice is ethanol, and the plant-why cannabis, of course. Presented here is the Soxhlet extraction, a solvent-based extraction method that’s been tried and true for over a century for removing compounds from plant and fruit matrices, both lipid-based and water-soluble. Making solvent-based extracts at home, particularly with the use of hydrocarbon solvents, has come under scrutiny in recent years, because of the safety hazards involved and the residual solvent left behind.
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