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Related Experiment Videos

Sarcomeric disorganization in post-mortem fish muscles.

C Astier1, J P Labbe, C Roustan

  • 1Centre de Recherches de Biochimie Macromoléculaire (C.N.R.S.), Unité 249 (I.N.S.E.R.M.), Montpellier, France.

Comparative Biochemistry and Physiology. B, Comparative Biochemistry
|January 1, 1991
PubMed
Summary

Fish muscle protein patterns change post-mortem, with titin and nebulin sensitive to proteolysis. Myosin levels decrease at higher storage temperatures, impacting fish quality.

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Area of Science:

  • Food Science
  • Biochemistry
  • Proteomics

Background:

  • Understanding post-mortem changes in fish muscle is crucial for maintaining quality and safety.
  • Protein degradation significantly impacts texture, flavor, and shelf-life of fish products.

Purpose of the Study:

  • To investigate the post-mortem evolution of protein patterns in fish striated muscle.
  • To determine the influence of storage time and temperature on protein degradation and extraction.

Main Methods:

  • Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) was used to analyze protein patterns.
  • Low and high ionic strength extractions were employed to separate sarcoplasmic and sarcomeric protein fractions.
  • Fish muscle samples were stored under various time and temperature conditions.

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Main Results:

  • No significant protein modifications were observed during the pre-rigor mortis phase.
  • High molecular weight proteins, titin and nebulin, exhibited high sensitivity to proteolysis during rigor mortis.
  • Myosin extractability was significantly affected by storage temperature, decreasing above 8°C during rigor mortis.
  • Alpha-actinin demonstrated resistance to proteolysis but could be released from the Z-disc structure during aging.

Conclusions:

  • Post-mortem storage conditions, particularly temperature, critically influence fish muscle protein integrity.
  • Specific proteins like titin, nebulin, and myosin are susceptible to degradation, affecting fish quality.
  • Further research into controlling these degradation pathways can optimize fish processing and preservation.