This work presents a method in which a desired protein may be separated from a biological protein preparation and identified by highly specific monoclonal antibody. The desired protein may be isolated from crude protein preparations by this method. The protein remains intact and stable throughout the procedure. This method utilizes common nonreducing conditions of polyacrylamide gel electrophoresis (PAGE), and Western Blot transfer of protein. This isolation of the desired protein can be accomplished for a microgram or tens of micrograms of material. The application of Western blot technique with monoclonal antibody permits the highest specificity in terms of identifying the target protein. In addition to identifying the target protein the method can isolate sufficient amounts for further characterization.