Study Cards on plasticiser, coating, polysaccharides

When a product is not rigid, but may change in shape, the coating needs to be flexible. What are the coatings based on?
  • Polymers (e.g. Proteins) can be adjusted to meet the flexibility demand
  • Pure proteins or polysaccharides (too brittle) + plasticiser (e.g. Glycerol)
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Why is water not a good plasticiser for proteins/polysaccharides to form a coating?
  • Water has the tendency to migrate to locations of low water activity
  • Water has the tendency to evaporate. If this happens, the film will at least lose its flexibility and the coating may fail
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How are the molecular weight of the plasticiser and the speed of migration related?
The larger the Mw, the slower its migration to other places will be.
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