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Properties of actomyosin isolated from cod ( Gadus morhua ) after various periods of storage in ice
Author(s) -
Chalmers M,
Careche M,
Mackie I M
Publication year - 1992
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740580312
Subject(s) - gadus , chemistry , trimethylamine , myosin , food science , viscosity , composition (language) , sodium , fish <actinopterygii> , chromatography , biochemistry , fishery , biology , organic chemistry , materials science , linguistics , philosophy , composite material
Natural actomyosin was isolated from cod ( Gadus morhua L) stored in ice for up to 28 days. The gelling properties, apparent viscosity, Ca 2‐ ‐ATPase activity and component protein composition by sodium dodecyl sulphate (SDS) electrophoresis were determined for each preparation of natural actomyosin. The apparent viscosity, protease activity, trimethylamine (TMA) content and pH of the fish muscle were also determined. The results showed that the apparent viscosity and Ca 2‐ ‐ATPase activity tended to decrease slightly during ageing of the fish in ice, whereas some of the gelling properties showed a maximum between 3 and 6 days of storage. However, there was no change in the apparent viscosity of the muscle as a whole even after the fish were considered to be stale according to the TMA values. The ratio of myosin heavy chain to actin in the actomyosin changed with the time of storage of the fish, being highest at 3 days when gelling properties were maximal and decreasing progressively thereafter.