PHA 327 - Exam 2 - Emulsions 1

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kyleannkelsey
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214941
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PHA 327 - Exam 2 - Emulsions 1
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2013-04-21 21:35:39
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PHA 327 Exam Emulsions
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PHA 327 - Exam 2 - Emulsions 1
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  1. What is an emulsion?
    • A heterogeneous mixture of two immiscible liquids/
    • One liquid is dispersed as fine globules within the other liquid
    • An emulsifying agent is also present
  2. What is the particle size rage of an emulsion?
    0.01 um to 10 um
  3. What is the term for the liquid in an emulsion that is dispersed in globules?
    The dispersed or internal phase
  4. What is the term for the liquid in an emulsion in which the globules are dispersed?
    The continuous or external phase
  5. What is the internal or dispersed phase of an emulsion?
    The liquid that is dispersed in globules
  6. What is the continuous or external phase of an emulsion?
    The phase in which the globules are dispersed
  7. Where is the emulsifying agent located in an emulsion?
    On the interface between the two liquids
  8. What is located at the interface between the two liquids of an emulsion?
    The emulsifying agent
  9. What are the four classifications of emulsions?
    • Oil-in-water
    • Water-in-oil
    • Multiple emulsions
    • Microemulsions
  10. Describe an oil-in-water emulsion:
    • Internal phase = oil
    • External phase = water
  11. What type of emulsifier is used for an oil-in-water emulsion?
    Hydrophilic emulsifier
  12. Which type of emulsifier is used for a water-in-oil emulsion?
    Lipophilic
  13. Describe a water-in-oil emulsion:
    • Internal phase = water
    • External phase = oil
  14. For what type of Emulsion would you use a hydrophilic emulsifying agent?
    Oil-in-water
  15. For what type of emulsion would you use a lipophilic emulsifier?
    Water-in-oil
  16. What is a W/O/W?
    A water-in-oil emulsion that is dispersed in an aqueous medium
  17. What is an O/W/O?
    An oil-in water emulsion that is dispersed in an oil based mdium
  18. O/W/O and W/O/W are both what classification of emulsion?
    Multiple emulsions
  19. Describe a microemulsion:
    Dispersions of insoluble liquids in another liquid that seems clear and homogenous to the naked eye
  20. What type of emulsion is made of two immiscible liquids that together look homogenous and clear to the naked eye?
    Microemulsion
  21. What type of emulsion is greasy?
    W/O
  22. What type of emulsion is not greasy?
    O/W
  23. What are O/W emulsions used for?
    • Provide cooling effects, i.e. vanishing cream
    • Internal uses
  24. What are W/O emulsions used for?
    • Prevent evaporation, i.e. cold cream
    • External uses
  25. Would you use an O/W or a W/O emulsion for external uses?
    W/O
  26. Would you use an O/W or a W/O emulsion for internal uses?
    O/W
  27. Which generally tastes better, W/O or O/W?
    O/W
  28. What is the size range of a microemulsion?
    10-200 nm
  29. What type of emulsion has dispersed droplets of about 10-200 nm?
    Microemulsions
  30. What are the advantages of a microemulsion?
    • Thermodynamically stable
    • Optically clear
    • Increased surface area
    • High solubilizing capabilities
  31. What type of emulsion has high solubilizing capabilities and an increased surface area?
    Micro-emulsions
  32. What are three tests that can be used to differentiate Emulsion types?
    • Dilution method
    • Dye solubility method
    • Conductivity tests
  33. What can the Dilution method, Conductivity test and Dye solubility test be used for?
    To differentiate the components and types of emulsions present
  34. Describe the Dilution test for emulsions:
    O/W emulsions can be diluted in water without any separation
  35. What test includes diluting an emulsion in water and looking for separation?
    Dilution method
  36. Describe the Dye solubility test:
    • Water soluble and Oil soluble dyes are added to an emulsions.
    • W/O emulsions will dissolve oil based dyes
    • O/W emulsions will dissolve water based dyes
  37. What test for emulsions is performed by adding lipid soluble or water soluble dyes to emulsions?
    The Dye solubility test
  38. Describe the Conductivity test:
    O/W emulsions will conduct electricity (W/O will not)
  39. What type of emulsion conducts electricity?
    O/W
  40. How do emulsions make oils more bioavailable?
    • Marcomolecules of oil are difficult to absorb
    • Emulsions reduce the particle size of oil globules, making them more bioavailable

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