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Preliminary Results of Radio Pasteurization (RAP)

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Paper number  026005,  2002 ASAE Annual Meeting . (doi: 10.13031/2013.10543) @2002
Authors:   David J. Geveke, Chris Brunkhorst, Michael F. Kozempel
Keywords:   Food safety, nonthermal pasteurization, RF energy, yeasts, electric field

Radio frequency energy was investigated as a nonthermal alternative to thermal pasteurization. Two RF power supply systems were assembled and provided frequencies in the range of 20 kHz to 27 MHz. Electric field strengths of 14 to 30 kV/cm were applied to suspensions of Saccharomyces cerevisiae in water over a temperature range of 28 to 55C. The flow rate was 1.2 l/min and the number of exposures to the fields ranged from 1 to 30. The population of S. cerevisiae was reduced by >5 log following 30 exposures to a 100 kHz, 25 kV/cm field at 28C. Increasing the field strength and temperature, as well as decreasing the frequency enhanced inactivation. These preliminary results of radio pasteurization, RAP, are encouraging and will be used in an effort to extend this technique to bacteria in vegetable and fruit juices.

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