Quality of frozen sea bass muscle stored (1, 3 and 5 months) at two levels of temperature (−15 and −25 °C)
after a pressure shift freezing process (200 MPa)—PSF—and/or a pressure assisted thawing process (200MPa)—
PAT — was evaluated in comparison with samples frozen and thawed using conventionalmethods (air-blast AF
and AT, respectively). Frozen storage of high-pressure treated samples did not significantly affect initial quality of
frozen muscle. Thus, parameters related to protein denaturation and extractability, water holding capacity and
color presented similar values than those obtained for not stored samples. In addition, the improvement of the
microstructure achieved by PSF application remains unchanged during frozen storage. On the other hand,
conventional treated samples experienced significant changes during frozen storage, such as protein denaturation,
and water holding capacity and color modifications. Storage temperatures did not have influence in the
quality of PSF and PAT samples, but it showed some effects in AF muscle.
Industrial relevance: This work demonstrates the potential application and benefits of high pressure (HP) in the
freezing and thawing of fishmeat in comparison to conventionalmethods, due to an improvement on the cellular
integrity of the tissue. Although some negative effects are produced during processing with HP, no additional
modifications occur during the frozen storage. The studied methodologies seemed to be very suitable for fish
freezing and thawing, especially for products which will be frozen stored and/or cooked.
Quality of frozen sea bass muscle stored (1, 3 and 5 months) at two levels of temperature (−15 and −25 °C)after a pressure shift freezing process (200 MPa)—PSF—and/or a pressure assisted thawing process (200MPa)—PAT — was evaluated in comparison with samples frozen and thawed using conventionalmethods (air-blast AFand AT, respectively). Frozen storage of high-pressure treated samples did not significantly affect initial quality offrozen muscle. Thus, parameters related to protein denaturation and extractability, water holding capacity andcolor presented similar values than those obtained for not stored samples. In addition, the improvement of themicrostructure achieved by PSF application remains unchanged during frozen storage. On the other hand,conventional treated samples experienced significant changes during frozen storage, such as protein denaturation,and water holding capacity and color modifications. Storage temperatures did not have influence in thequality of PSF and PAT samples, but it showed some effects in AF muscle.Industrial relevance: This work demonstrates the potential application and benefits of high pressure (HP) in thefreezing and thawing of fishmeat in comparison to conventionalmethods, due to an improvement on the cellularintegrity of the tissue. Although some negative effects are produced during processing with HP, no additionalmodifications occur during the frozen storage. The studied methodologies seemed to be very suitable for fishfreezing and thawing, especially for products which will be frozen stored and/or cooked.
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