Abstract

Mantles of squid at different sexual maturation stages were frozen and stored at −30 °C. Similar biochemical properties of actomyosin from unfrozen mantles of both immature and mature squid were found. A decrease in extractability, reduced viscosity, and Mg2+-ATPase activity of actomyosin was observed during frozen storage. The decrease in the biochemical properties of actomyosin was independent of the sexual maturation stage of the specimens. The relative percentages of myosin and actin in actomyosin from unfrozen mantles of immature squid were significantly different from those of actomyosin of mature squid. Myosin significantly decreased (p < 0.0l) in frozen stored samples. Keywords: Myofibrillar proteins; biochemical properties; frozen storage; squid mantle

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