Dr Tomas Skoglund has derived a simple relationship between z-value (Bigelow method) and activation energy (Arrhenius model) that enables the  z-value, a term used in microbial thermal death time calculations, to be corrected to comply with Arrhenius kinetics.

I have produced a free On-Line calculator to enable users to see the difference in Fo values obtained by using either method in UHT processing.

For the first time students, engineers and food technologists can easily see the differences in Fo values calulated using either method.