Microbiology

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Sodium benzoate

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Microbiology

Definition

Sodium benzoate is a chemical compound widely used as a preservative in food and pharmaceuticals. It inhibits the growth of bacteria, yeast, and fungi by altering their internal pH.

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5 Must Know Facts For Your Next Test

  1. Sodium benzoate is effective in acidic conditions with a pH less than 7.
  2. It works by disrupting the microbial cellular respiration process.
  3. Commonly used concentrations are between 0.1% to 0.5% in food products.
  4. It is often combined with other preservatives for enhanced antimicrobial efficacy.
  5. Sodium benzoate can convert to benzene, a known carcinogen, under certain conditions, such as high heat and presence of vitamin C.

Review Questions

  • In what type of environment is sodium benzoate most effective?
  • What is the primary mechanism by which sodium benzoate controls microbial growth?
  • Why might sodium benzoate be combined with other preservatives?

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