Sarcoplasmic Reticulum Ca2+-ATPase and Cytochrome Oxidase as Indicators of Frozen Storage in Cod (Gadus morhua) |
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| Authors: | H. Godiksen G. Hyldig R Jessen |
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| Affiliation: | Authors are with the Danish Inst. for Fisheries Research, Dept. of Seafood Research, Technical Univ. of Denmark, Building 221, DK-2800 Lyngby, Denmark. Direct inquiries to author Godiksen (E-mail: ). |
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| Abstract: | ABSTRACT: Activities of 2 membrane-bound enzymes, Ca2+-ATPase from the sarcoplasmic reticulum and cytochrome oxidase from the inner mitochondria membrane, were measured during frozen storage of cod. Enzyme activities were higher in cod muscle samples frozen at −30°C than at −20°C. Freezing-induced activation of both enzymes was observed and the activation was amplified by ice storage prior to freezing. Sensory evaluation conducted at 9 mo of frozen storage showed differences between the sensory properties of cod frozen immediately after catch and frozen after 3 d of storage on ice. These results indicated that the enzymes might be useful as indicators of quality changes by frozen storage. |
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| Keywords: | cod cytochrome oxidase frozen storage ice storage SR Ca2+-ATPase |
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