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Chemical Preservation of Perishable Products quiz

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  • What is the main requirement for chemicals used in food preservation?
    They must be non-toxic and safe for ingestion.
  • What is the purpose of chemical preservation in perishable products?
    It delays spoilage by inhibiting microbial growth in items likely to go bad quickly, such as fruits and vegetables.
  • Name three organic acids commonly used as antimicrobial agents in food preservation.
    Benzoic acid, sorbic acid, and propionic acid.
  • How do organic acids inhibit microbial growth in foods?
    They create an acidic environment that affects microbial cell membranes, preventing the growth of most bacteria and molds.
  • What is a key structural feature of benzoic acid that contributes to its acidic properties?
    It contains a carboxylic acid group.
  • Why is bread treated with organic acids safer to eat than untreated bread?
    Treated bread resists mold and microbial growth, while untreated bread allows microbes to grow, making it unsafe.
  • What is the reduced form of nitrate used in food preservation?
    Nitrite is the reduced form of nitrate.
  • What is one major use of nitrates and nitrites in processed meats?
    They inhibit the germination of Clostridium botulinum endospores, preventing bacterial growth.
  • How do nitrates and nitrites affect the appearance of processed meats?
    At high concentrations, they help preserve the pinkish color of meats like hot dogs and fresh steaks.
  • What can happen to meats not treated with nitrates or nitrites?
    They can develop growth of Clostridium botulinum, making them unsafe to eat.
  • What is a potential health risk associated with nitrates and nitrites in food?
    They can be converted into nitrosamines, which are carcinogenic.
  • How can nitrosamines form from nitrates and nitrites?
    They form through improper cooking or by the action of certain gut bacteria.
  • Why are organic acids considered weak acids in food preservation?
    They only partially dissociate in water, creating a mildly acidic environment that inhibits microbes without harming humans.
  • What is the main function of chemical preservatives in bread and juices?
    To prevent microbial growth and extend shelf life by creating unfavorable conditions for microbes.
  • What is the dual benefit of using nitrates and nitrites in meat preservation?
    They both inhibit dangerous bacterial growth and maintain the appealing color of processed meats.