Patent ID: 7884195

Claim:
A method of extracting ginsenoside Rg 2 from leaves and berries of Araliaceae panax and American ginseng ( Panax quinquefolius Linn.) plants, comprising: subjecting the raw material to hot-water extraction and concentration to obtain concentrates, adding a lower alcohol to the concentrates to precipitate and remove foreign materials; decolorizing the remaining supernatant and recovering the lower alcohol; adding a salting-out agent to a saturation concentration so as to obtain precipitates and re-dissolving the precipitates in water, followed by gradient salting-out to obtain differential precipitates corresponding to different concentrations of the salting-out agent; analyzing to divide the precipitates into ginsenoside Rg 2 -enriched fractions and ginsenoside Rg 2 non-enriched fractions; destaining and decolorizing the ginsenoside Rg 2 -enriched fractions with a destaining agent, followed by concentration to obtain concentrates; and adding the lower alcohol to re-crystallize the resulting concentrates, thereby obtaining ginsenoside Rg 2 .