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- W2015686504 abstract "A computational fluid dynamics (CFD) model describing the flow, electric field and temperature distribution of a laboratory-scale pulsed electric field (PEF) treatment chamber with co-field electrode configuration was developed. The predicted temperature increase was validated by means of integral temperature studies using thermocouples at the outlet of each flow cell for grape juice and salt solutions. Simulations of PEF treatments revealed intensity peaks of the electric field and laminar flow conditions in the treatment chamber causing local temperature hot spots near the chamber walls. Furthermore, thermal inactivation kinetics of lactoperoxidase (LPO) dissolved in simulated milk ultrafiltrate were determined with a glass capillary method at temperatures ranging from 65 to 80°C. Temperature dependence of first order inactivation rate constants was accurately described by the Arrhenius equation yielding an activation energy of 597.1 kJ mol−1. The thermal impact of different PEF processes on LPO activity was estimated by coupling the derived Arrhenius model with the CFD model and the predicted enzyme inactivation was compared to experimental measurements. Results indicated that LPO inactivation during combined PEF/thermal treatments was largely due to thermal effects, but 5–12% enzyme inactivation may be related to other electro-chemical effects occurring during PEF treatments. © 2012 American Institute of Chemical Engineers Biotechnol. Prog., 2012" @default.
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- W2015686504 date "2012-07-26" @default.
- W2015686504 modified "2023-10-06" @default.
- W2015686504 title "Numerical evaluation of lactoperoxidase inactivation during continuous pulsed electric field processing" @default.
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- W2015686504 doi "https://doi.org/10.1002/btpr.1582" @default.
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