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Food Science and Technology QUESTION #5952
Question 1
The lactoperoxidase system can be deliberately activated to preserve raw milk. What substrates must be added?
  • \(\text{H}_2\text{O}_2\) and thiocyanate (\(\text{SCN}^-\))✔️
  • \(\text{NaCl}\) and \(\text{H}_2\text{O}_2\)
  • Lysozyme and \(\text{H}_2\text{O}_2\)
  • \(\text{NaOH}\) and thiocyanate
Correct Answer Explanation
FAO/WHO-approved LP system activation: add \(15\;\text{mg/L}\) sodium percarbonate (\(\text{H}_2\text{O}_2\) source) and \(15\;\text{mg/L}\) sodium thiocyanate (\(\text{SCN}^-\) source). The endogenous lactoperoxidase catalyzes: \(\text{H}_2\text{O}_2 + \text{SCN}^- \rightarrow \text{OSCN}^-\), inhibiting gram-negative bacteria and extending raw milk keeping quality by \(4\text{–}8\) hours at ambient temperature.