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Pharmaceutical Microbiology: Cold Sterilization Methods
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Pharmaceutical Microbiology: Cold Sterilization Methods

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Questions and Answers

What is the mechanism of action of ethylene oxide in sterilization?

  • Inhibition of DNA replication
  • Oxidation of cellular components
  • Denaturation of enzymes
  • Alkylation of hydroxyl and carboxyl groups of proteins and nucleic acids (correct)
  • What is the capacity of a gas autoclave used for ethylene oxide sterilization?

  • 100-300 L (correct)
  • 20-50 L
  • 50-100 L
  • 400-600 L
  • Which factor affects the efficacy of ethylene oxide sterilization?

  • Ionic strength
  • pH level
  • Concentration (correct)
  • Light exposure
  • What is the temperature range for effective ethylene oxide sterilization?

    <p>45-63°C</p> Signup and view all the answers

    Which material does ethylene oxide penetrate during sterilization?

    <p>Plastic and rubber</p> Signup and view all the answers

    Study Notes

    Mechanism of Action of Ethylene Oxide

    • Alkylating agent that denatures proteins and disrupts DNA, preventing microorganisms from reproducing
    • Reacts with amino, hydroxyl, and sulfhydryl groups in proteins and nucleic acids, rendering them inactive

    Ethylene Oxide Sterilization

    Capacity of Gas Autoclave

    • Typically ranges from 100 to 10,000 liters, depending on the size of the items to be sterilized

    Factors Affecting Efficacy of Ethylene Oxide Sterilization

    • Temperature
    • Humidity
    • Concentration of ethylene oxide
    • Exposure time
    • Type and quantity of microorganisms present
    • Presence of organic matter or moisture

    Temperature Range for Effective Ethylene Oxide Sterilization

    • 49°C to 63°C (120°F to 145°F)

    Material Penetration

    • Ethylene oxide penetrates:
      • Plastics
      • Rubber
      • Fabric
      • And other porous materials
    • Allows for sterilization of heat-sensitive materials

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    Description

    Test your knowledge of cold sterilization methods in pharmaceutical microbiology with this quiz. Learn about gas sterilization, radiation, and filtration techniques commonly used in the industry.

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