Differential lipid damage in various muscle zones of frozen hake (Merluccius merluccius) |
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Authors: | S P Aubourg M Rey-Mansilla and Carmen G Sotelo |
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Affiliation: | (1) Instituto de Investigaciones Marinas (CSIC), Eduardo Cabello 6, E-36208 Vigo, Spain, e-mail: saubourg@iim.csic.es, ES |
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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.
Received: 16 June 1998 |
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Keywords: | Frozen storage Hake Lipid damage Muscle zones Quality |
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