Disperse Systems: Emulsions and Emulsifying Agents
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Disperse Systems: Emulsions and Emulsifying Agents

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Questions and Answers

What is the fraction of Tween 80 used in the emulsion formulation?

  • 0.25
  • 0.75
  • 0.42
  • 0.58 (correct)
  • What is the fraction of Span 80 used in the emulsion formulation?

  • 0.58
  • 0.25
  • 0.75
  • 0.42 (correct)
  • How much Sorbitan monooleate is required for the emulsion formulation?

  • 50 g
  • 2.1 g (correct)
  • 2.9 g
  • 5 g
  • How much Polyoxyethylene 20 sorbitan monoleate is required for the emulsion formulation?

    <p>2.9 g</p> Signup and view all the answers

    What is the purpose of heating the oil-soluble sorbitan monooleate to 75°?

    <p>To dissolve it in the oil</p> Signup and view all the answers

    Why is the water-soluble polyoxyethylene 20 sorbitan monooleate added to the aqueous phase at 70°?

    <p>To prevent it from solidifying</p> Signup and view all the answers

    What does the formulator mean by not being restricted to using only the mentioned emulsifying agents?

    <p>Other combinations of emulsifying agents can also achieve an HLB of 10.5</p> Signup and view all the answers

    Why are various methods employed for emulsion preparation?

    <p>To adapt to the nature of components and desired emulsion characteristics</p> Signup and view all the answers

    What is the primary indication for Castor Oil Emulsion?

    <p>Laxative for constipation</p> Signup and view all the answers

    Which type of emulsion are many hand and body lotions for dry skin?

    <p>o/w emulsions</p> Signup and view all the answers

    What are liniments intended for?

    <p>Rubbing on the skin</p> Signup and view all the answers

    What does Simethicone Emulsion act as?

    <p>Defoaming agent for relief of gastrointestinal gas symptoms</p> Signup and view all the answers

    What is the emulsifying agent formed from the combination of olive oil and calcium?

    <p>Oleic acid</p> Signup and view all the answers

    What equipment is used on a larger scale for emulsion formation?

    <p>High-speed impellers</p> Signup and view all the answers

    Which process refers to the aggregation or joining of droplets without any change in primary droplet size?

    <p>Flocculation</p> Signup and view all the answers

    What contributes to the tendency of aggregates of globules to rise to the top or fall to the bottom of an emulsion?

    <p>Phase separation</p> Signup and view all the answers

    What is the primary purpose of pharmaceutical emulsions?

    <p>To enhance the stability of drugs</p> Signup and view all the answers

    Which factor plays a significant role in affecting the stability of emulsions?

    <p>Particle size of the dispersed phase</p> Signup and view all the answers

    What distinguishes microemulsions from macroemulsions?

    <p>Microemulsions are optically transparent</p> Signup and view all the answers

    What is the primary function of emulsifying agents in pharmaceutical emulsions?

    <p>To reduce the interfacial tension between oil and water phases</p> Signup and view all the answers

    What is the ratio of surfactant A to surfactant B to achieve a total HLB value of 9.0?

    <p>1:2</p> Signup and view all the answers

    How is the total HLB value of a mixture of surfactants calculated?

    <p>Adding the HLB values of the surfactants</p> Signup and view all the answers

    Why may combining two or more emulsifiers be necessary to achieve the required HLB value?

    <p>To achieve the desired stability of the emulsion</p> Signup and view all the answers

    What is assumed to be an algebraic summation of the HLB for a mixture of surfactants?

    <p>$HLB_{total} = HLBA ( X) + HLBB (1-X)$</p> Signup and view all the answers

    What is the crucial step to consider prior to emulsion preparation?

    <p>Dissolving water-soluble ingredients in the aqueous phase</p> Signup and view all the answers

    Why is it important to warm the aqueous phase 2-3°C above the oil phase?

    <p>To prevent local crystallization of waxes</p> Signup and view all the answers

    Why should alcohol or solutions containing alcohol not be added directly to the primary emulsion?

    <p>To prevent precipitation of gums such as acacia</p> Signup and view all the answers

    When should substances that might interfere with the stability of the emulsion be added?

    <p>After all diluents are added</p> Signup and view all the answers

    Why is the Forbes bottle method not suitable for viscous oils?

    <p>Viscous oils cannot be thoroughly agitated in the bottle when mixed with the emulsifying agent.</p> Signup and view all the answers

    What is the purpose of passing an emulsion through a hand homogenizer?

    <p>To reduce the globules of the internal phase to a very small size.</p> Signup and view all the answers

    What type of soaps are developed by the In Situ Soap Method?

    <p>Calcium soaps and soft soaps.</p> Signup and view all the answers

    Why are viscous oils not suitable for the Forbes bottle method?

    <p>They cannot be thoroughly agitated in the bottle when mixed with the emulsifying agent.</p> Signup and view all the answers

    In emulsion terminology, what is the dispersed phase also known as?

    <p>Internal phase</p> Signup and view all the answers

    What is the primary role of an emulsifying agent in preparing a stable emulsion?

    <p>To prevent the aggregation of droplets</p> Signup and view all the answers

    Which type of emulsion can be diluted or extended with water or an aqueous preparation?

    <p>Oil-in-Water (o/w) Emulsions</p> Signup and view all the answers

    What distinguishes multiple emulsions from macroemulsions?

    <p>The presence of more than two immiscible liquids</p> Signup and view all the answers

    Why is the dry gum method generally employed when the intended dispersed phase is a mixture of fixed oil and volatile oil?

    <p>To increase the emulsion's stability</p> Signup and view all the answers

    What is the primary reason for passing an emulsion through a hand homogenizer?

    <p>To reduce the particle size of very thick emulsions</p> Signup and view all the answers

    What are the two types of soaps developed by the In Situ Soap Method?

    <p>Calcium soaps and magnesium soaps</p> Signup and view all the answers

    Why is the Forbes bottle method not suited for viscous oils?

    <p>Because it cannot thoroughly agitate viscous oils mixed with the emulsifying agent in the bottle</p> Signup and view all the answers

    What is the fraction of Polyoxyethylene 20 sorbitan monoleate required for the emulsion formulation?

    <p>3.8 g</p> Signup and view all the answers

    What is the total HLB value of the mixture of Tween 80 and Span 80 used to produce a physically stable liquid paraffin emulsion?

    <p>10.5</p> Signup and view all the answers

    Why might combining two or more emulsifiers be necessary to achieve the required HLB value?

    <p>To modify the hydrophilic-lipophilic balance</p> Signup and view all the answers

    What contributes to the tendency of aggregates of globules to rise to the top or fall to the bottom of an emulsion?

    <p>Density difference between the dispersed phase and dispersion medium</p> Signup and view all the answers

    Why is it important for o/w emulsions to be easily removed from the skin?

    <p>To enhance percutaneous absorption</p> Signup and view all the answers

    What is a crucial step required to prevent the separation of phases in pharmaceutical emulsions?

    <p>Careful formulation to prevent the separation of phases</p> Signup and view all the answers

    Which characteristic makes w/o emulsions more suitable for dry skin?

    <p>Resisting drying and removal by contact with water</p> Signup and view all the answers

    What is a disadvantage of pharmaceutical emulsions?

    <p>Require careful formulation to prevent phase separation</p> Signup and view all the answers

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