Emulsions - Effect of polymer addition in different concentrations
3 important questions on Emulsions - Effect of polymer addition in different concentrations
When polymers and polysaccharides have the same charge, the stability of the emulsion is dependent on the concentration of the polysaccharide, how?
- Low concentration --> emulsion becomes more stable. Less flocculation and due to an increased viscosity, less creaming will occur
- High concentration --> depletion interactions. More flocculation, more creaming and eventually phase separation
What happens when polysaccharides are added after emulsification? Why is the concentration important?
- Low concentration --> bridging flocculation --> creaming and unstable emulsion
- Higher concentration --> stable --> steric repulsion (droplets completely covered). Flocculation inhibited for the moment. Highly (-)polysaccharides will still be negative and electrostatic repulsion will also occur.
- Even higher concentration --> not stable --> depletion interactions (present in continuous phase) --> flocculation of oil droplets and less stable emulsions
What happens when polysaccharides are added before emulsification?
Protein-polysaccharide complexes will be formed. Depending on the size, they will adsorb on the interface. If the coacervates are too large to stabilise the emulsion, phase separation will occur.
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