Effect of Post-rigor Fish Storage on Ice on Physicochemical Properties of Actomyosina

Actomyosin was purified from post-rigor fish stored for various times on ice and was characterised by Mg2+-ATPase activity, ATP-sensitivity and SDS-polyacrylamide gel electrophoretic patterns. It had a similar reduced viscosity to that of the myo-fibrillar extract and the viscosity of both extracts fell in a similar manner as the time of storage of the whole fish on ice increased. No changes in the extractability, the Mg2+-ATPase activity or the electrophoretic pattern of actomyosin were detected when extracted from fish muscle held for up to 11 days in ice. 1