Patent ID: 7629006

Claim:
A process for preparing an extract of Rhus verniciflua by using water and organic solvents in extraction of the active ingredients of Rhus verniciflua , which comprises: (a) adding water or a mixture of water and alcohol as a solvent to Rhus verniciflua to extract the soluble components, then filtering out the solids to obtain a filtrate, and concentrating and drying the filtrate to obtain a solid fraction; (b) re-extracting the solid fraction obtained in the previous step with ethanol having a purity of 95 to 99(%)(v/v), then filtering out the insolubles to obtain a filtrate, and concentrating and drying the filtrate to obtain a solid fraction; (c) adding a saturated hydrocarbon having 5 to 7 carbon atoms to the solid fraction obtained in the previous step to dissolve allergy-inducing components, and then removing the hydrocarbon to obtain a solid fraction; (d) adding water to the solid fraction obtained in the previous step to extract water-soluble components; and (e) adding alumina to the filtrate obtained in the previous step to remove allergy-inducing components by adsorption, filtering the resulting mixture, and then concentrating and freeze-drying the filtrate to obtain a solid fraction.