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How to change F value to log reductions

Printed From: Dairy Science and Food Technology
Category: Thermal processing
Forum Name: Thermal processing
Forum Description: Effects of heat on food, enzymes and microorganisms
URL: https://www.dairyscience.info/forum/forum_posts.asp?TID=247
Printed Date: 01 Dec 2020 at 11:01am
Software Version: Web Wiz Forums 12.03 - http://www.webwizforums.com


Topic: How to change F value to log reductions
Posted By: beachgirl
Subject: How to change F value to log reductions
Date Posted: 07 Dec 2010 at 7:56pm
Hi me again!
 
For some of our lines we have to work the no of log kills. knowing the F value can you tell us how to do this plaese!
 
Thanks



Replies:
Posted By: Admin
Date Posted: 07 Dec 2010 at 10:08pm
Thanks for the question.
There are a number of  processes where there are  statutory requirements to submit the product to a heat-treatment that reduces the survival of a target organism by a defined number of log cycles.
 
The number of log reductions can easily be calculated using the equation below. 
 
FRT = DRT x log reduction.  So divide the F-value by the D-value to obtain the number of log cycle kills. 
RT= reference temperature.
D = decimal reduction time (minutes) at RT.
F =
 
equivalent time (minutes) at RT required to achieve specified level of microbial death. 
 
 



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