Effect of different solvents on percentage extraction of tanshinones
The experimental results show that except n-butyl acetate, ethanol, methanol, acetone, n-butanol, ethyl acetate and tetrahydrofuran can reach almost the same high percentage extraction of tanshinones. As the ethanol is non-toxic and can be mixed with water in different ratio, so it is chosen to extract tan- shinones from Salvia miltiorrhiza bunge.