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Food Science and Technology QUESTION #5933
Question 1
The inhibitory system in raw milk providing natural antimicrobial protection is:
  • The complement system
  • The lactoperoxidase-thiocyanate-\(\text{H}_2\text{O}_2\) (LP) system: \(\text{H}_2\text{O}_2 + \text{SCN}^- \xrightarrow{\text{LPO}} \text{OSCN}^-\)✔️
  • The lactoferrin-iron sequestration system
  • The lysozyme-murein lysis system
Correct Answer Explanation
The LP system: \(\text{H}_2\text{O}_2\) (substrate) \(+\) \(\text{SCN}^-\) \(+\) lactoperoxidase (enzyme) \(\rightarrow\) hypothiocyanite (\(\text{OSCN}^-\)) that oxidizes microbial sulfhydryl groups, inhibiting bacterial growth. This system provides \(\approx 2\text{–}3\) hours of protection in raw milk at ambient temperature.