February 23rd 2021

18 / 06 / 2018

Elea PEF expert publishes paper on onion drying

Elea’s PEF expert Robin Ostermeier publishes paper on ‚Influence of pulsed electric field (PEF) pre-treatment on the convective drying kinetics of onions‘.

The paper was released together with researchers including P. Giersemehl, C. Siemer, S. Töpfl and H. Jaeger (BOKU, Austria) in the Journal of Food Engineering, Volume 237, November 2018, Pages 110-117.

Link to paper at Elsevier


This work discusses the effect of pulsed electric field (PEF) parameters on the convective drying process of fresh onions.

First, the PEF treatment parameters and their influence on the cell disruption were investigated by applying various PEF settings (W = 0.2–20.0 kJ/kg, E = 0.36–1.07 kV/cm). The diffusion coefficient De was calculated and mathematic modelling was conducted.

PEF was found to enhance the internal diffusion, but not necessarily to result in an increased drying rate. The shortest drying time at a drying temperature of 60 °C was achieved for onion samples treated at 4 kJ/kg and 1.07 kV/cm.

Subsequent drying trials were performed at the pre-determined PEF settings and different drying temperatures resulting in a PEF related drying time reduction of 30.3%, 21.4% and 6.4% at 45 °C, 60 °C and 75 °C to reach a residual moisture (Mr) of 7%, respectively.

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