Emulsions DF 2

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Author:
swynocker
ID:
49619
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Emulsions DF 2
Updated:
2010-11-14 22:59:39
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Emulsions DF
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Emulsions DF 2
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  1. Emulsions Definition
    Two immsicble liquids mixed, one is droplets inside the other.
  2. T/F o/w emulsions are used for topical creams.
    False, W/O emulsions are used for those.
  3. advantages of oral emulsions
    • increased palatability
    • improve digestibility
  4. disadvantages of emulsions
    • microbe growth
    • heavy
    • instability vs solids
    • limited use
  5. T/F industrially the oil/water mixutre is homogenized
    True
  6. T/F droplet aggregation irreversibly alters an emulsion
    False, can be reversible.
  7. Interfacial tension is the force per ____ existing at the _____ between two ______ liquids.
    • unit length
    • interfact
    • Imiscible
  8. Creaming results from the ______ and concentration of the ______ phase.
    • Floculation
    • Dispersed
  9. Difference between creaming and coalescence
    In coalescence they come together, in creaming they havent come together yet.
  10. Surfactant emulsifers reduce the ______ needed to mix the immiscible liquids
    Force
  11. Surfactant types
    • Electric repulsion (ionic)
    • Steric repulsion (non ionic)
  12. Suspending agents alter the ____ phase.
    Continuous
  13. T/F gums are suspending agents
    True
  14. T/F methyl paraben is oil soluble and propyl, butyl paraben are water soluble.
    False, flipped
  15. HLB means
    Hydroliphophilic Balance
  16. Increased surfactant polarity means increased hydrophilicity True or false?
    True
  17. High HLB will yield a __ emulsion, low HLB will yield a __ emulsion.
    • O/W
    • W/O
  18. T/F As internal phase volume increases, viscosity decreases.
    False, it increases due to increased friction.
  19. Phase inversions occur when
    Internal phase becomes too high (60-85%) and it switches phases.
  20. Microemulsions are nearly ___________ stable and form _______.
    • Thermodynamically
    • Spontaneously
  21. T/F microemulsions are transparent
    True, they are smaller than light wave lengths
  22. Neoral self emulsifies in-____
    Vivo

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