Thermal Inactivation Kinetics of Tulane Virus in Cell-Culture Medium and Spinach

Journal of Food Science
Sukriti AilavadiDoris H D'Souza

Abstract

Human noroviruses (HNoVs) cause significant gastrointestinal disease outbreaks worldwide. Tulane virus (TV) is a cultivable HNoV surrogate widely used to determine control measures against HNoVs. The objective of this study was to determine the heat inactivation kinetics (D- and z-values) of TV in cell-culture media and on spiked homogenized spinach using the first-order and Weibull models. TV in cell-culture media at approximately 7 log PFU/mL (PFU-plaque forming unit) in 2-mL glass vials was heated at 52, 54, and 56 °C for up to 10 min in a circulating water bath. Survivors were enumerated using confluent host LLC-MK2 cells in six-well plates by plaque assay. Data from three replicate treatments assayed in duplicate were analyzed statistically. D-values by the first-order model for TV in cell-culture media at 52, 54, and 56 °C were 4.59 ± 0.05, 2.91 ± 0.05, and 1.74 ± 0.07 min, respectively, with a z-value of 9.09 ± 0.01 °C (R2  = 0.997). The Weibull model showed td = 1 values of 2.53 ± 0.08, 1.99 ± 0.10, and 0.57 ± 0.64 min, respectively, at the same temperatures. The D-values for TV in spinach were 7.94 ± 0.21, 4.09 ± 0.04, and 1.43 ± 0.02 min and the z-value was 10.74 ± 0.01 °C (R2  = 0.98) by the first-order model and 4.8...Continue Reading

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Citations

Jul 12, 2020·Applied Physiology, Nutrition, and Metabolism = Physiologie Appliquée, Nutrition Et Métabolisme·Michael A PitinoSharon Unger
Aug 7, 2020·Food and Environmental Virology·Caroline E R Rowell, Hana M Dobrovolny
May 1, 2021·Journal of Food Science·Sukriti AilavadiDoris H D'Souza

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