Journal
FOODS
Volume 10, Issue 6, Pages -Publisher
MDPI
DOI: 10.3390/foods10061405
Keywords
rearing systems; fillet quality; protein characterization; hardness; liquid loss
Categories
Funding
- Ministry of Education, Youth, and Sports of the Czech Republic [LM2018099, CZ.02.1.01/0.0/0.0/16_025/0007370, GACR 17-09594S]
- Ministry of Agriculture of the Czech Republic: NAZV project [QK1710310]
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The study investigated the impact of different storage conditions on the final fillet quality of Eurasian perch from different rearing systems. It was found that fillet deterioration during frozen storage was mainly caused by the formation of ice crystals followed by protein oxidation, while protein oxidation was the main concern during refrigerated storage.
The current knowledge on how different Eurasian perch rearing systems impact the final fillet quality is scant. Therefore, two domestic storage conditions were investigated-10 months frozen (-20 degrees C) and 12 days refrigerated (+4 degrees C) storage conditions-in order to determine (i) how the choice of rearing system affects fillets quality during different processing conditions and (ii) if oxidative changes and other quality parameters were interactive. For the proposed idea, proteome analysis, oxidative changes, and some quality parameters were considered in this study. Sodium dodecyl-sulfate polyacrylamide gel electrophoresis (SDS-PAGE) indicated a higher loss of protein in the frozen fillets from ponds (PF) than the fillets from recirculating aquaculture systems (RAS) (RF). Western blot showed a higher protein carbonyls level in RF compared to PF, which was confirmed by the total protein carbonyls during frozen storage. PF indicated less liquid loss, hardness, and oxidation progress than RF in both storage conditions. The biogenic amines index (BAI) in the fillets from either origin showed acceptable levels during storage at +4 degrees C. Furthermore, the n-3/n-6 ratio was similar for both fillets. The deterioration of fillets during frozen storage was mainly caused by formation of ice crystals followed by protein oxidation, while protein oxidation was the main concern during refrigerated storage confirmed by principal component analysis (PCA) analysis.
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