LAUSR

Abstract A gentle preservation concept for heat sensitive protein formulations based on the application of pulsed electric fields (PEF) was developed. The inactivation of L. innocua in 2 and 10% whey protein isolate (WPI) formulations at two different pH levels (4 and 7), with inlet temperatures of 20–40 °C, and a maximum outlet temperature of 58 °C was studied, applying different PEF treatment conditions. Results showed an inactivation of up to 6.51 log 10 cycles of L. innocua with limited or no impact on the concentration of selected heat sensitive bioactives from their initial values before PEF treatment. The efficiency of the inactivation decreased with increasing protein concentrations and pH values. The differentiation of thermal and electric field effects revealed a maximum of 1 log 10 cycle of thermal inactivation at the highest PEF treatment intensity. The traditional D-value concept was successfully transferred to model the PEF inactivation kinetics.