Protein in Extracts of Prerigor and Postrigor Scallop Striated Muscle

The extraction of protein from the striated muscle (prerigor and postrigor) of scallop (Placopecten magellanicus) by salt solutions of various strengths and at pH 7 was investigated. With postrigor muscle the structural proteins appeared in the extract only at ionic concentrations (Γ/2) greater than 0.3.With prerigor muscle, most of the protein was extracted at Γ/2 = 0.15. A large part of this protein precipitated from the extract upon standing, and when redissolved in stronger salt solutions resembled myosin B in sedimentation behavior and ultraviolet absorption.