Question Bank • QB_DFE_EXP_044 NAT • 2 Marks

Section 7: Dairy and Food Engineering

Preservation of Food

Subtopic: Kinetics of microbial death – pasteurization and sterilization of milk and other liquid foods

Question Statement:

A canned food product contains an initial population of $N_0 = 10^6$ bacterial spores per can. After a thermal retorting process, the survival population is reduced to $N = 1$ spore per can. The number of decimal reductions ($n = \log_{10}(N_0 / N)$) achieved is ________ (answer in integer).

Answer Key:

6

Step-by-Step Solution & Explanation

Decimal reductions $n$: $n = \log_{10}\left(\frac{N_0}{N}\right) = \log_{10}\left(\frac{10^6}{1}\right) = \log_{10}(10^6) = 6$
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