Please explain a 6.5 log10 reduction in Salmonella in laymans terms?
What does it mean to have a 6.5 log10 (6.5D) reduction in Salmonella spp. (in meat products that contain no poultry) and a 7.0 log10 (7.0D) reduction in Salmonella spp. (in meat products containing poultry).
How will you explain the above calculations in layman terms?
What does it mean to have a 6.5 log10 (6.5D) reduction in Salmonella spp. (in meat products that contain no poultry) and a 7.0 log10 (7.0D) reduction in Salmonella spp. (in meat products containing poultry).
How will you explain the above calculations in layman terms?
Hi iswarya,
The math presentation is a bit mixed up.
I think you are asking meaning of (a) a reduction of 6.5 Log and (b) a reduction of 7 Log where logarithms of base 10 are involved.
I hope link below can explain the calculation OK for you, but you will also need a calculator (or PC) for (a) -
https://microchemlab...crobial-testing
you can probably deduce from link that -
(b) reduction of 7Log = 99.99999% reduction
(a) reduction of 6.5 Log = a %reduction somewhere between 99.9999% and 99.99999% The exact answer needs a calculator (or excel) and is given by the formula in above link -
P = (1-10-L) x 100 where P = % reduction and L = log reduction, ie 6.5
So required calculation is P = (1-10-6.5) x 100
I don't have a calculator with me so maybe someone else can do it.
(I think you already know that 6.5D = (numerically) a reduction of 6.5Log etc )
IF above is bit math-heavy for you, an explanation in more bacterial terms is here -
Just picture a "log 10" as one zero in a number.
Log 1 = 10
Log 2 = 100
Log 3 = 1,000
Log 4 = 10,000
Log 5 = 100,000
Log 6 = 1,000,000
Log 7 = 10,000,000
So log 6.5 is roughly somewhere between 1,000,000 to 10,000,000 salmonella reduced after the cook or other "kill" step.
Just picture a "log 10" as one zero in a number.
Log 1 = 10
Log 2 = 100
Log 3 = 1,000
Log 4 = 10,000
Log 5 = 100,000
Log 6 = 1,000,000
Log 7 = 10,000,000
So log 6.5 is roughly somewhere between 1,000,000 to 10,000,000 salmonella reduced after the cook or other "kill" step.
Sorry but the above is numerically incorrect.
For example, -
Log1 = Log10 (1) = 0
and -
logarithms.PNG 12.35KB 4 downloads
Mathematically -
logb(x) = y exactly if by = x and x >0 and b > 0 and b not = 1
for example, log2 64 = 6, as 26 = 64.
Similarly 100 = 1
The difficulty derives from the fact that "1 Log" does not equal "Log10(1)"
Woops...you are right. Thanks for setting me straight. I was thinking in terms of log reduction; not log10.