Poorly Water-Soluble Drug Formulation
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Questions and Answers

What effect does reducing the particle size of griseofulvin have on its solubility and dissolution rate?

  • Increases solubility and dissolution rate (correct)
  • Has no impact on solubility and dissolution rate
  • Reduces solubility but increases dissolution rate
  • Decreases solubility and dissolution rate
  • Why is it important to optimize the particle size of dispersed phases in cosmetic cream formulations?

  • To achieve the desired sensory attributes (correct)
  • To increase particle interlocking
  • To enhance flowability of the cream
  • To ensure a gritty texture
  • Which type of particles tend to pack more closely and have less air space between them, affecting flowability?

  • Irregular or angular particles
  • Spherical or smooth particles
  • Denser particles (correct)
  • Less dense particles
  • How can electrostatic charge affect the flowability of a material?

    <p>Reduce flowability</p> Signup and view all the answers

    What is the role of moisture in powder flowability?

    <p>Acts as a binder or a lubricant depending on the amount and type of moisture</p> Signup and view all the answers

    What happens to cement's flowability when it is hydrated?

    <p>Decreases due to chemical bonds</p> Signup and view all the answers

    How does particle size affect the solubility and dissolution rate of a drug?

    <p>Smaller particles have higher solubility and dissolution rate due to increased surface area.</p> Signup and view all the answers

    What technique can be employed to reduce the particle size of a drug?

    <p>Micronization or nanosizing</p> Signup and view all the answers

    Why does reducing the particle size of griseofulvin enhance its solubility and dissolution rate?

    <p>It increases surface area.</p> Signup and view all the answers

    What is a drawback of smaller particles compared to larger particles in terms of stability?

    <p>Smaller particles have lower stability due to increased aggregation tendency.</p> Signup and view all the answers

    How does reducing particle size affect the flowability of a drug?

    <p>Smaller particles have better flowability as they can slide past each other more easily.</p> Signup and view all the answers

    Which drug is provided as an example in the text that is affected by particle size?

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

    Study Notes

    Poorly Water-Soluble Drug Formulation

    • Larger particle size is associated with poor dissolution and reduced bioavailability of a drug.
    • Smaller particles have higher solubility and dissolution rates due to increased surface area.
    • Techniques like micronization or nanosizing can be used to reduce particle size and enhance dissolution rates.
    • Example of a drug affected by particle size is griseofulvin, which has low solubility and dissolution rate, but reducing its particle size increases its surface area, enhancing solubility and dissolution rate.
    • Smaller particles have lower stability due to increased susceptibility to aggregation, oxidation, or degradation.
    • Smaller particles may have better flowability due to their ability to slide past each other more easily.

    Cosmetic Cream Formulation

    • Particle size of dispersed phases in emulsions affects the sensory attributes of creams and lotions.
    • Larger particles can result in a gritty or unpleasant texture.
    • Optimizing particle size of emulsifying agents and active ingredients ensures a smooth and aesthetically pleasing product.

    Particle Flowability

    • Flowability is the ability of a solid material to move or flow smoothly and easily.
    • Particle size, shape, density, surface area, moisture content, electrostatic charge, and interparticle interactions affect flowability.
    • Irregular or angular particles have lower flowability due to interlocking, whereas spherical or smooth particles have higher flowability.
    • Denser particles have lower flowability due to less air space, while less dense particles have higher flowability.
    • Electrostatic charge and interparticle interactions, such as van der Waals forces or chemical bonds, affect the cohesion and flowability of the material.
    • Moisture can act as a binder or lubricant between particles, affecting flowability.

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    Description

    Explore preformulation studies for a poorly water-soluble drug, focusing on assessing particle size and its impact on dissolution rate and bioavailability. Learn how smaller particles enhance solubility due to increased surface area exposed to the solvent.

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