Freeze-Drying and Protein Preservation Quiz
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Questions and Answers

What is the purpose of leaving a gap between the lyophilizing machine and stopper?

  • To accelerate the evaporation of water
  • To prevent the formation of ice during freezing
  • To increase the pressure inside the machine
  • To accommodate water molecules during lyophilization (correct)
  • Why is it necessary to lower the temperature and pressure to create a vacuum during lyophilization?

  • To prevent the formation of ice crystals
  • To maintain the stability of the protein
  • To create ice without forming a liquid first (correct)
  • To accelerate the evaporation of water
  • What happens to the pH when using a phosphate buffer at lower temperatures during lyophilization?

  • The pH increases due to higher solubility of phosphate salt at lower temperatures
  • The pH decreases due to lower solubility of phosphate salt at lower temperatures (correct)
  • The pH remains constant regardless of temperature
  • The pH becomes acidic due to the formation of ice crystals
  • Why is it advised not to use a phosphate buffer for unstable molecules during lyophilization?

    <p>Phosphate salt has lower solubility at lower temperatures, leading to pH changes</p> Signup and view all the answers

    What is the likely stress encountered by protein molecules during freezing and drying that could cause degradation?

    <p>b and c</p> Signup and view all the answers

    What is the likely outcome to the residual water content in the powder using a drying gas with high temperature and low humidity at a high aspirator flow?

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

    What method can be used to detect aggregation in proteins?

    <p>SDS-page electrophoresis</p> Signup and view all the answers

    Which spectroscopic method provides insights into aromatic residues, disulfide bonds, and tertiary structures?

    <p>Circular dichroism (CD) spectroscopy, specifically the near Uv CD (&gt;240)</p> Signup and view all the answers

    What does ionic exchange HPLC separate proteins based on?

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

    What does Size Exclusion HPLC detect in proteins?

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

    What is the primary purpose of spray freeze drying?

    <p>To reduce residual moisture in the powder</p> Signup and view all the answers

    What is the likely effect of phosphate buffers on pH at lower temperatures?

    <p>Increase in pH</p> Signup and view all the answers

    What is the likely impact of phosphate buffers on stability for unstable molecules?

    <p>Negative impact</p> Signup and view all the answers

    What is the primary function of a phosphate buffer?

    <p>To maintain pH</p> Signup and view all the answers

    What is the purpose of spray drying gas with high temperature and low humidity?

    <p>To reduce residual moisture in the powder</p> Signup and view all the answers

    What is the likely outcome of increasing aspirator air flow in the spray drying process?

    <p>Increase in cyclone efficiency for powder collection</p> Signup and view all the answers

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