The invention relates to the technical field of biological
pharmacy, in particular to a method for extracting
bile acid from pig bile, which comprises the following steps: (1) taking the pig bile, adjusting the pH value of the pig bile to be alkaline, heating the pig bile to 80-90 DEG C, stirring at constant temperature for 25-35 minutes, then cooling to
room temperature, and adjusting the pH value of the
system to be neutral to obtain pretreated pig bile; (2) filtering the pretreated pig bile in the step (1) by using a hyperbranched
polymer film, concentrating filtrate under reduced pressure, adding an
ethanol solution, heating to
reflux, stirring for 25-35 minutes, and then filtering to obtain a crude
bile acid product; and (3) adding a
hydrochloric acid solution into the crude
bile acid product in the step (2), adjusting the pH value to 2-3, centrifuging, filtering, washing and
drying the obtained
solid, adding
ethyl acetate, heating to
reflux until the
solid is dissolved, cooling to
room temperature, stirring for 2-4 hours, recrystallizing, separating and
drying to obtain the bile acid. The extraction method is simple, and the extraction purity is high.