Calculating Lethality during Retort Processing
Step 1: Product Time - Temperature Data from Experiments
Enter Time - Temperature data:
Instructions for Pasting data from the Spreadsheet: 1. Donot copy headers. 2. Data should be in two columns only. 3. Left Column should be time (min). 4. Right Column should be Temperature of Product (Deg F). 5. Delete these instructions and then only paste your data.
Entered data is:
Step 2: Reference Information for Selected Microbial Species
Reference Temperature, T
ref
=
o
F
o
C
D-value at Reference Temperature, D
ref
=
min
sec
Z-value =
o
F
o
C
Step 3: Lethality of the Thermal Process
Total Microbial Log Reductions =
Equivalent F-value of Thermal Process =
min
sec