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Food Science and Technology QUESTION #5878
Question 1
Bactofugation removes bacteria from milk using:
  • Microfiltration membranes
  • High-speed centrifugation exploiting density difference between bacteria \((\rho \approx 1.1\;\text{g/mL})\) and milk \((\rho \approx 1.032\;\text{g/mL})\)✔️
  • UV irradiation
  • Chemical bacteriostats
Correct Answer Explanation
Bactofugation uses centrifugal separators rotating at \(\approx 20{,}000\) rpm. Bacteria \((\rho \approx 1.1\;\text{g/mL})\) are denser than milk \((\rho \approx 1.032\;\text{g/mL})\) and are sedimented as a concentrate, reducing spore count by up to \(99\%\).