Abstract
A comparison of the lipid damage produced in different hake zones was carried out during frozen storage at –11 and –18 °C. Three light muscle zones and the dark muscle were considered. Lipid oxidation [conjugated dienes; thiobarbituric acid index (TBA-i); fluorescence formation] and hydrolysis (free fatty acids, FFA) were determined. The most predominant lipid damage in all zones was hydrolysis, at the end of storage reaching values of about 40% (for the light muscle zones) and 12% (for the dark muscle) of the total lipids at –11 °C. Significant (P<0.05) correlation value (r=0.67–0.85) relationships between the frozen storage time and the FFA content were obtained for the four muscle zones at both temperatures. A comparison of the regression lines slopes in the different zones showed that a lower (P<0.05) lipolitic activity was produced in the dark muscle compared to the three light zones at both temperatures. A low lipid oxidation development was produced in the three light muscle parts, so that no significant differences between them could be assessed. However, the dark muscle showed a higher oxidation development (TBA-i and fluorescence formation) as a result of a higher lipid content and the presence of prooxidant constituents.
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Received: 16 June 1998
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Aubourg, S., Rey-Mansilla, M. & Sotelo, C. Differential lipid damage in various muscle zones of frozen hake (Merluccius merluccius). Z Lebensm Unters Forsch 208, 189–193 (1999). https://doi.org/10.1007/s002170050400
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DOI: https://doi.org/10.1007/s002170050400