Effect of Hydroperoxides Produced by Photosensitized Oxidation of Methyl Oleate on Carp Myofibrillar Protein

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  • Effect of Hydroperoxides Produced by Ph

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Abstract

The effect of photooxidized methyl oleate on the carp myofibrillar ATPase activity and the crosslinking reaction of myosin heavy chains were investigated.<br> Upon addition of photooxidized methyl oleate, the myofibrillar Ca-ATPase activity changed biphasically; a gradual increase in the activity by the addition of a small amount was followed by a decrease in the activity by further addition. On the contrary, the K-ATPase activity simply decreased by the addition of photooxidized methyl oleate. Moreover, the photooxidized methyl oleate induced the cross-linking reaction of myosin heavy chains. Both the changes in ATPase activity and the increase of cross-linked myosin heavy chains were related to the content of peroxide present in photooxidized methyl oleate.<br> Hydroperoxides isolated from photooxidized methyl oleate by thin layer chromatoraphy decreased the K-ATPase activity and induced the cross-linking of myosin heavy chains. These changes in myofibrillar protein induced by hydroperoxides were very similar to those with autoxidized triglycerides.<br> Therefore, it was indicated that hydroperoxides produced during the autoxidation of lipids caused the ATPase activity change and cross-linking reaction of mvosin heavy chains.

Journal

  • Fisheries science

    Fisheries science 62 (1), 69-72, 1996

    The Japanese Society of Fisheries Science

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