Controlling Dangerous Bacteria in Food & Beverage Processing Operations - 3

Understanding Performance Characteristics
Anti-microbial performance is usually discussed in terms of Log Kill, Percent Kill, and Log Reduction. Let's discuss
the differences between these.
Log Kill is the measure of the starting population of organisms minus the number of surviving organisms. The results
are reported as a logarithm of the killed organisms. For example, if the starting population is 1,000,000 organisms,
and the number of surviving organisms is 750, the Log Kill rate is:
Log Kill= Log (1,000,000- 750) = Log (999,250) = 5.9997
Percent Kill involves the same formula from above, except that the result is represented as a percentage. Utilizing
the same rate as above, the Percent Kill would be:
Percent Kill= (999,250/ 1,000,000) * 100= 99.925%
Log Reduction is the reduction factor calculated using the initial starting population of the organisms compared to
the surviving number. The results in this case are reported as a base 10 Log. See page 5 for an illustration of the Log
Reduction factor for several different kill examples and associated Percent Kill values.
Log
1
2
3
4
5
6
Reduction Factor
10
100
1000
10000
100000
1000000
Remaining Organisms
100000
10000
1000
100
10
1
Percent Kill
90%
99%
99.9%
99.99%
99.999%
99.9999%
E. coli at 24 hoursUntreated
E.
coli at 24 hoursTreated
with Perma-Kleen
Controlling Dangerous Bacteria: Perma-Kleen 3

Controlling Dangerous Bacteria in Food & Beverage Processing Operations

Table of Contents for the Digital Edition of Controlling Dangerous Bacteria in Food & Beverage Processing Operations

Controlling Dangerous Bacteria in Food & Beverage Processing Operations - 1
Controlling Dangerous Bacteria in Food & Beverage Processing Operations - 2
Controlling Dangerous Bacteria in Food & Beverage Processing Operations - 3
Controlling Dangerous Bacteria in Food & Beverage Processing Operations - 4
Controlling Dangerous Bacteria in Food & Beverage Processing Operations - 5
Controlling Dangerous Bacteria in Food & Beverage Processing Operations - 6
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