Water soluble and insoluble proteins were extracted from codfish samples subjected to a rapid freeze (– 196°C), a slow freeze (– 15°C), 1 min microwave heating, and from fresh extracts. The water soluble protein content decreased significantly in both frozen samples and in the microwave heated samples when compared to fresh extracts. Analysis by SDS PAGE showed a significant loss in water soluble proteins after microwave treatment concomittant with the appearance of two high molecular weight species. No differences were apparent in the nonsoluble protein SDS PAGE profiles.
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