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  • Title: Effects of pressure-shift freezing and pressure-assisted thawing on sea bass (Dicentrarchus labrax) quality.
    Author: Tironi V, LeBail A, de Lamballerie M.
    Journal: J Food Sci; 2007 Sep; 72(7):C381-7. PubMed ID: 17995636.
    Abstract:
    Effects of pressure-shift freezing and/or pressure-assisted thawing on the quality of sea bass muscle were evaluated and compared with conventional (air-blast) frozen and thawed samples. Microstructural analysis showed a marked decrease of muscle cell damage for pressure-assisted frozen samples. According to differential scanning calorimetry (DSC), protein extractability, and SDS-PAGE results, high-pressure treatment (200 MPa) produced a partial denaturation with aggregation and insolubilization of the myosin, as well as alterations of the sarcoplasmic proteins. Only small differences between high-pressure processes (freezing or/and thawing) were registered. High-pressure-treated systems led to a decrease of water holding capacity but differences between high-pressure and conventional methods disappeared after cooking. Muscle color showed important alterations due to high-pressure treatments (increasing L* and b*).
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