Home › MCQs › Food Science and Technology › Question #5935
Back to Questions
Food Science and Technology QUESTION #5935
Question 1
What is the implication for LTLT pasteurization (\(63^{\circ}\text{C}/30\;\text{min}\)) given that the \(D_{62.8^{\circ}C}\) of \(M.\;bovis\) is \(\approx 0.5\;\text{min}\)?
  • LTLT achieves a 2-log reduction only
  • LTLT achieves a 30-log reduction of \(M.\;bovis\)
  • LTLT achieves \(\dfrac{30\;\text{min}}{0.5\;\text{min}} = 60\)-log reduction of \(M.\;bovis\), far exceeding the safety requirement✔️
  • LTLT does not inactivate \(M.\;bovis\) because it is a mycobacterium
Correct Answer Explanation
LTLT (\(63^{\circ}\text{C}/30\;\text{min}\)): using \(D_{63} = 0.5\;\text{min}\) for \(M.\;bovis\), log reduction \(= \dfrac{30}{0.5} = 60\)-log reduction — vastly exceeding the regulatory requirement. Historical pasteurization was designed with substantial safety margins to inactivate \(M.\;bovis\) and \(Brucella\;abortus\).