The most common liquid current is too liquid CO2. CO2 has a tipping point low, inexpensive, non-toxic and environmentally friendly, can withdraw, not increase the greenhouse effect. When extracted active substances from medicinal herbs, liquid CO2 tipping more beneficial too the conventional organic solvents in less toxic, performance enhancement and does not leave residue solvent in extracting high. In addition the process extracts can proceed at low temperatures should not alter the ingredients less stable.One of the downsides of the SFE is the polarity of the liquid CO2 too. In the conventional extraction conditions of liquid CO2, so tipping is a less polar solvent, so can only content to extract the inferior polar substances. To improve the ability to dissolve polar substances than in the process of extracting, add liquid CO2 is too limited to certain amounts of a polar solvent (such as methanol) to change the polarity of the solvent to extract the polar substances.
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