TY - JOUR
T1 - Inactivation of Escherichia coli K-12 and Listeria innocua in milk using radio frequency (RF) heating
AU - Awuah, G. B.
AU - Ramaswamy, H. S.
AU - Economides, A.
AU - Mallikarjunan, K.
N1 - Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2005/12/1
Y1 - 2005/12/1
N2 - Using a 2 kW, 27.12 MHz RF heater, studies were conducted to evaluate the effectiveness of RF heating in inactivating surrogates of both Listeria and Escherichia coli cells in milk under continuous flow conditions. Depending on product residence time and RF power level, RF heating was found to be capable of inactivating both Listeria and E. coli in milk, with E. coli being the more heat sensitive of the two. For a total residence time of 55.5 s (i.e., 29.5 and 26 s in the applicator and holding tube, respectively), up to 5- and 7-log reductions were found for heating Listeria and E. coli, respectively at 1200 W, and an applicator tube exit temperature of approximately 65 °C. This study demonstrates that RF heating could be used to effectively pasteurize milk by manipulating incident power levels and flow rate. While these studies have been conducted under mild fluid flow (laminar) conditions, further studies are necessary to justify its industrial application using more realistic flow conditions.
AB - Using a 2 kW, 27.12 MHz RF heater, studies were conducted to evaluate the effectiveness of RF heating in inactivating surrogates of both Listeria and Escherichia coli cells in milk under continuous flow conditions. Depending on product residence time and RF power level, RF heating was found to be capable of inactivating both Listeria and E. coli in milk, with E. coli being the more heat sensitive of the two. For a total residence time of 55.5 s (i.e., 29.5 and 26 s in the applicator and holding tube, respectively), up to 5- and 7-log reductions were found for heating Listeria and E. coli, respectively at 1200 W, and an applicator tube exit temperature of approximately 65 °C. This study demonstrates that RF heating could be used to effectively pasteurize milk by manipulating incident power levels and flow rate. While these studies have been conducted under mild fluid flow (laminar) conditions, further studies are necessary to justify its industrial application using more realistic flow conditions.
KW - Heating rates
KW - Microbial inactivation
KW - Milk
KW - Radio frequency (RF)
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U2 - 10.1016/j.ifset.2005.06.002
DO - 10.1016/j.ifset.2005.06.002
M3 - Article
AN - SCOPUS:25644433573
SN - 1466-8564
VL - 6
SP - 396
EP - 402
JO - Innovative Food Science and Emerging Technologies
JF - Innovative Food Science and Emerging Technologies
IS - 4
ER -