Abstract
A method is descrd. for isolation, from cold-processed defatted soybean meal of a crystalline protein which inhibited the proteolytic action of trypsin. The inhibitor was pptd. when heated in 2.5% trichloracetic acid, and did not diffuse through collodion or Cellophane membranes. Its absorp. spectrum was that of a typical protein with max. absorp. at 2800 A and minimum at 2520 A.