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Oxidative rancidity
oils in the oily fish react with the oxygen in the air.Oxygen combines with carbons in double bands along the unsaturated fatty acid chain, causing the fish to become rancid.
Guidelines for storing fish
Effects of cooking on fish
Effects of Cooking fish
Fish processing
Freezing
Process
Effects
Examples
Fish can be frozen by commercial blast freezing at -30°C, or home freezing at -25°C
No effect on colour, flavour and texture • Microorganisms are inactivared
Some loss of B-group vitamins and extractives during drip loss when thawed
Freezer burn may occur if packaging is damaged
Oxidative rancidity and enzyme deterioration for too long
3-6 months.