Changes in physical, chemical, microbiological and sensory qualities of individual quick frozen (IQF) and
contact plate frozen (CPF) oyster (Crassostrea belcheri) meat, treated and untreated with butylated
hydroxyanisole (0.02% BHA suspension) during storage at 20 C for 12 months were investigated.
Increase in expressible drip of IQF oyster was slower than that of CPF oyster, due to the fact that quick
freezing (IQF) resulted in less tissue damage than slow freezing (CPF). Neither freezing method nor antioxidant
treatment caused significant changes in chemical qualities, i.e., pH, moisture, crude protein,
crude fat and total volatile basic nitrogen (TVB-N), nor in microbiological qualities, i.e., total viable count
(TVC), psychrotrophic bacteria, Escherichia coli and Vibrio parahaemolyticus. During frozen storage, TVC
and psychrotrophic bacteria of both BHA-treated and untreated CPF oyster decreased with storage time
increases (p < 0.05) at a slower rate than in IQF oyster. Antioxidant treatment could minimise sensory
quality changes, especially the colour of frozen oyster during storage.
2010 Elsevier Ltd. All rights reserved.
Changes in physical, chemical, microbiological and sensory qualities of individual quick frozen (IQF) andcontact plate frozen (CPF) oyster (Crassostrea belcheri) meat, treated and untreated with butylatedhydroxyanisole (0.02% BHA suspension) during storage at 20 C for 12 months were investigated.Increase in expressible drip of IQF oyster was slower than that of CPF oyster, due to the fact that quickfreezing (IQF) resulted in less tissue damage than slow freezing (CPF). Neither freezing method nor antioxidanttreatment caused significant changes in chemical qualities, i.e., pH, moisture, crude protein,crude fat and total volatile basic nitrogen (TVB-N), nor in microbiological qualities, i.e., total viable count(TVC), psychrotrophic bacteria, Escherichia coli and Vibrio parahaemolyticus. During frozen storage, TVCand psychrotrophic bacteria of both BHA-treated and untreated CPF oyster decreased with storage timeincreases (p < 0.05) at a slower rate than in IQF oyster. Antioxidant treatment could minimise sensoryquality changes, especially the colour of frozen oyster during storage. 2010 Elsevier Ltd. All rights reserved.
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