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Week 3: Interactions Between Packaging Materials & Foods - Coggle…
Week 3: Interactions Between Packaging Materials & Foods
Corrosion: the chemical reaction between a metal and its environment. :check:
2 factors influencing corrosiveness of foods
Intensity
Type of corrosive attack
5 Examples of corrosion accelerators in foods
Nitrates
Anthocyanins
Oxygen
Sulfur compounds
Trimethylamines
5 classes of foods based on corrosiveness
Mildly corrosive
Strong detinners
Moderately corrosive
Beverages
Highly corrosive
Migration: Release of substances originally present in packaging materials into food
Overall migration: Sum of all mobile packaging components released per unit area of packaging material under defined test conditions.
Specific migration: The amount of individual and identifiable compounds released per unit area of packaging material under defined test conditions.
Substance diffuse through the material to the packaging surface before transferring into the headspace (space between lid/seal and top of food) or dissolved in food
affect food quality or rendering food toxic. Max. migration limits for substance in food packaging is regulated
Examples: Lead in ceramic can enter food such as spinach. Cadmium can enter food such as lettuce. (
https://www.researchgate.net/publication/269990252_Determination_of_Lead_and_Cadmium_in_Food_Samples_by_the_Coprecipitation_Method
)
Sorption: penetration and dispersal of permeant molecules
may result in quality change
Examples: Perfumes in soap can be picked up by fatty foods kept in plastics under certain conditions.