Sublethal injury and recovery of Escherichia coli O157:H7 after ohmic heating

Food Control ◽  
2018 ◽  
Vol 94 ◽  
pp. 85-92 ◽  
Author(s):  
Xiaojing Tian ◽  
Qianqian Yu ◽  
Lele Shao ◽  
Xingmin Li ◽  
Ruitong Dai
2016 ◽  
Vol 79 (9) ◽  
pp. 1616-1622 ◽  
Author(s):  
SANG-SOON KIM ◽  
HYE-JUNG SUNG ◽  
HYO-SUN KWAK ◽  
IN-SUN JOO ◽  
JEONG-SU LEE ◽  
...  

ABSTRACT The effect of power levels on inactivation of Escherichia coli O157:H7, Salmonella Typhimurium, and Listeria monocytogenes in tomato paste was investigated using 915-MHz microwave heating (MW) and ohmic heating (OH). Heating uniformity, pathogen inactivation, and quality aspects were determined with 1.8-, 2.1-, 2.4-, and 3.0-kW MW and corresponding OH. GInaFit was used to analyze pathogen inactivation. The heating uniformity of MW-treated samples was inferior to that of OH-treated samples at low power levels of 1.8 to 2.4 kW but improved as the power level increased. Pathogen inactivation of MW-treated samples was significantly higher than that of OH-treated samples at low power levels of 1.8 to 2.4 kW (P < 0.05) but was not significantly different at the highest power level of 3.0 kW (P > 0.05). Quality aspects (color, pH, and lycopene content), except for L*, of MW-treated samples were not significantly degraded (P > 0.05) by increased power levels. Our results indicate that increasing power levels of MW ensures heating uniformity and microbiological safety and preserves quality aspects of tomato paste.


2020 ◽  
Vol 128 ◽  
pp. 108815 ◽  
Author(s):  
Xiaojing Tian ◽  
Yi Liu ◽  
Qianqian Yu ◽  
Lele Shao ◽  
Xingmin Li ◽  
...  

2019 ◽  
Vol 127 (5) ◽  
pp. 1430-1441 ◽  
Author(s):  
X. Tian ◽  
L. Shao ◽  
Q. Yu ◽  
Y. Liu ◽  
X. Li ◽  
...  

2011 ◽  
Vol 74 (6) ◽  
pp. 899-904 ◽  
Author(s):  
HUN-GU SAGONG ◽  
SANG-HYUN PARK ◽  
YOUNG-JIN CHOI ◽  
SANGRYEOL RYU ◽  
DONG-HYUN KANG

The effects of ohmic heating on reduction of Escherichia coli O157:H7, Salmonella Typhimurium, and Listeria monocytogenes in orange and tomato juice were investigated. Orange and tomato juice inoculated with E. coli O157:H7, Salmonella Typhimurium, and L. monocytogenes were subjected to ohmic heating with selected parameters including electric field strength from 10 to 20 V/cm and treatment times from 0 to 540 s. The number of pathogens was reduced by increasing the electric field strength from 10 to 20 V/cm as well as increasing treatment time. The population of E. coli O157:H7 was reduced more than 5 log after 120, 210, and 540 s of treatment in orange juice with 20, 15, and 10 V/cm electric field strengths, respectively. In tomato juice, levels of E. coli O157:H7 were reduced more than 5 log after 90, 180, and 480 s with the same electric field strengths. Similar phenomena were observed for Salmonella Typhimurium and L. monocytogenes, but E. coli O157:H7 was the most resistant to ohmic heating treatment. These results show that ohmic heating is potentially useful for inactivation of E. coli O157:H7, Salmonella Typhimurium, and L. monocytogenes and that the effect of inactivation depends on applied electric field strength, treatment time, pathogen species, and type of juice.


2021 ◽  
Vol 140 ◽  
pp. 109989
Author(s):  
Xiaojing Tian ◽  
Qianqian Yu ◽  
Lele Shao ◽  
Wladimir Silva-Vera ◽  
Xingmin Li ◽  
...  

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