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Challenges of the usage of ultra-low temperatures for fish freezing and storage

Challenges of the usage of ultra-low temperatures for fish freezing and storage

Category
Part of a book/report
Abstract
The physical states of frozen fish (muscles and oils) was analysed in the temperature range between -150.0 and 20.0 °C. The information of the glass transition temperature, the end of freezing point, the amount of unfrozen water, the amount of liquid fraction of oil was obtained by the method of Differential Scanning Calorimetry (DSC). Five commercial fish species were investigated: Atlantic Cod, Atlantic Herring, Atlantic Mackerel, Atlantic Salmon and Rainbow Trout. The glass transition was detected in the temperature range between -84.2 °C and -67.7 °C in fish muscles. The amount of unfreezable water was calculated in the range between 5.1 and 8.6 %. A significant fraction of fish oil (between 40.0 and 60.0%) remained unfrozen at ultra-low temperatures. The packaging materials with medium barrier properties were considered to be of a great importance for the long-term storage of fatty fish due to a high amount of liquid fats at these temperatures. The two temperatures provided the high quality storage were proposed: below -35 °C and below -86 °C.
Language
English
Author(s)
Affiliation
  • Norwegian University of Science and Technology
  • SINTEF Energy Research / Termisk energi
  • SINTEF Ocean / Prosessteknologi
Year
2015
Published in
Actes du ... Congres international du froid
ISSN
1025-9031
Publisher
International Institute of Refrigeration
Book
Proceedings of the 24th International Congress of Refrigeration
Booklet
2015
ISBN
978-2-36215-012-8