Abstract
AbstractCell damage, as measured by the escape of deoxypentose nucleic acid (DNA) into the intercellular spaces, was studied in cod fillets frozen from one side at different speeds. Three distinct types of damage were revealed by peaks in the DNA/freezing time curves, at freezing times of about 27, 75 and greater than 125 minutes. Microphotographs of the muscle frozen in about 75 minutes showed that at this rate of freezing the changeover from intra‐ to extra‐cellular freezing was occurring. In fillets frozen from both sides it had previously been found that these conditions gave rise to much DNA escape. The other two types of damage are to be discussed later.
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