The term natural products has become the "catch-all" for any compound that has been produced by a living being, e.g. plant, animal, algae. The extracted compounds are used in, or are themselves, foods, medicinals, pigments, fragrances. The process for many years was to extract from the matrix material by solvents: aqueous and petroleum based. The first large scale use of supercritical fluids in extracting natural products was the decaffeination of coffee in 1979 and since then thousands of compounds have been extracted commercially.
Growing environmental concerns have renewed interest supercritical fluids as the “green” alternative for natural products extractions. Find out how “green” your process.
http://appliedseparations.com/Supercritical/SCF_Uses/SCF_for_Natural_Products.asp
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