Method for extracting deoxyschisandrin and schisandrin B from schisandra

The invention discloses a method for extracting deoxyschisandrin and schisandrin B from schisandra, comprising the following steps: 1) crushing the schisandra, extracting with 80-95% ethanol by volume concentration, concentrating extracting solution to obtain concentrated solution; 2) adding ethanol in the concentrated solution and ensuring that the concentration of ethanol is 60-65% by weight, centrifuging and collecting supernate; 3) passing the supernate through a macroporous resin column, eluting with 55-65% ethanol by volume concentration, wherein the weight of ethanol is 1.5-2.5 times of that of the resin, collecting eluent A, and drying to obtain deoxyschisandrin extract; and 4) eluting with 85-95 % ethanol by volume concentration, wherein the weight of ethanol is 2.5-3.5 times of that of the resin, collecting eluent B, and drying to obtain schisandrin B extract. By using the method in the invention, the deoxyschisandrin and schisandrin B are eluted in turn, so that the deoxyschisandrin and schisandrin B are separated, wherein the content of the deoxyschisandrin is 0.8-1.2%, and the content of the schisandrin B is 3-4%.