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Related Experiment Videos

[Protein denaturation in frozen fish].

Z E Sikorski, S Kostuch, I Kolodziejska

    Die Nahrung
    |January 1, 1975
    PubMed
    Summary

    Formaldehyde, generated from trimethyl-amine oxide during storage, significantly reduces protein solubility in frozen minced fish. Reducing formaldehyde levels, through methods like water leaching, can help preserve fish meat quality.

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    Area of Science:

    • Food Science
    • Biochemistry
    • Marine Biology

    Context:

    • On-board processing of minced fish involves freezing, which can lead to rapid deterioration of product quality.
    • Protein denaturation is a primary cause of this deterioration, impacting texture and technological properties.
    • Understanding the factors contributing to protein denaturation is crucial for improving fish preservation.

    Purpose:

    • To investigate the causes of protein denaturation in minced fish during frozen storage.
    • To quantify the impact of formaldehyde and salt content on protein solubility.
    • To evaluate the effectiveness of water leaching in mitigating formaldehyde-induced damage.

    Summary:

    • Formaldehyde, formed from trimethyl-amine oxide during storage, significantly reduces sarcoplasmic and myofibrillary protein solubility in frozen minced cod.
    • Protein solubility decreased by up to 70% (sarcoplasmic) and 65% (myofibrillary) in the presence of formaldehyde.
    • Water leaching removed formaldehyde and improved myofibrillary protein solubility, though salt restitution reversed this benefit.

    Impact:

    • Identifies formaldehyde as a key factor in the degradation of frozen minced fish quality.
    • Provides quantitative data on the effects of formaldehyde and salt on protein solubility.
    • Suggests water leaching as a potential strategy to improve the shelf-life and quality of frozen minced fish products.

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