Subtopic: Kinetics of microbial death – pasteurization and sterilization of milk and other liquid foods
Question Statement:
Eight log cycle reduction of Clostridium botulinum having z-value of 9°C needs a process time of 1.5 minute at 121°C. The same degree of reduction at 130°C temperature will require a process time of
Options:
(A) 72 s
(B) 54 s
(C) 18 s
(D) 9 s
Official Answer Key:
D
Step-by-Step Solution & Explanation
Thermal death time varies with temperature per: F₂ = F₁ × 10^[−(T₂−T₁)/z]. F₁ = 1.5 min = 90 s at T₁=121°C; T₂=130°C, z=9°C. F₂ = 90 × 10^(−9/9) = 90 × 10⁻¹ = 9 s.
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