The effects of cryogenic and air blast freezing techniques on catfish fillet quality during frozen storage
was evaluated. Fresh channel catfish fillets were cryogenically frozen by liquid carbon-dioxide using a
pilot plant size cabinet type cryogenic freezer (CF) and by air blast (BF) frozen to 21 C, separately.
Freezing time (FT), freezing rate (FR), and energy removal rate (ERR) for freezing depend on the freezing
techniques, which affect energy consumption and frozen seafood quality. The frozen fillets were stored
at 20 C and analyzed for weight loss, relative moisture loss, color, and lipid oxidation (Thiobarbituric
acid; TBA) after 1-day, 1-month, 3-months, and 6-months of storage. Triplicate experiments were conducted
and data were statistically analyzed at a ¼ 0.05. FT for cryogenic freezing and air blast freezing
were 19.3, and 55.1 min, respectively. Cryogenic freezing had higher FR (1.29 C/min) and ERR (10.62 J/s)
than BF (0.46 C/min and 3.38 J/s, respectively). The cryogenically frozen catfish fillets had a lower
freezing loss than fillets frozen by air blast freezing. TBA (mg MDA/kg sample) of the fillets frozen by CF
was 0.94 which was lower than BF (1.25). The study demonstrated that catfish fillets cryogenically frozen
had better quality characteristics than blast frozen catfish fillets after 6-months of storage
The effects of cryogenic and air blast freezing techniques on catfish fillet quality during frozen storagewas evaluated. Fresh channel catfish fillets were cryogenically frozen by liquid carbon-dioxide using apilot plant size cabinet type cryogenic freezer (CF) and by air blast (BF) frozen to 21 C, separately.Freezing time (FT), freezing rate (FR), and energy removal rate (ERR) for freezing depend on the freezingtechniques, which affect energy consumption and frozen seafood quality. The frozen fillets were storedat 20 C and analyzed for weight loss, relative moisture loss, color, and lipid oxidation (Thiobarbituricacid; TBA) after 1-day, 1-month, 3-months, and 6-months of storage. Triplicate experiments were conductedand data were statistically analyzed at a ¼ 0.05. FT for cryogenic freezing and air blast freezingwere 19.3, and 55.1 min, respectively. Cryogenic freezing had higher FR (1.29 C/min) and ERR (10.62 J/s)than BF (0.46 C/min and 3.38 J/s, respectively). The cryogenically frozen catfish fillets had a lowerfreezing loss than fillets frozen by air blast freezing. TBA (mg MDA/kg sample) of the fillets frozen by CFwas 0.94 which was lower than BF (1.25). The study demonstrated that catfish fillets cryogenically frozenhad better quality characteristics than blast frozen catfish fillets after 6-months of storage
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