Response of some microorganisms to ultraviolet treatment on fresh-cut pear

Ultraviolet energy at a wavelength of 253.7 nm (UV-C) was investigated for its microbicidal effects on pear slices with and without peel. Effectiveness of UV-C light against Listeria innocua ATCC 33090, Listeria monocytogenes ATCC 19114 D, Escherichia coli ATCC 11229, and Zygosaccharomyces bailli NR...

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Detalles Bibliográficos
Autores principales: Schenk, Marcela Liliana, Guerrero, Sandra, Alzamora, Stella Maris
Publicado: 2008
Materias:
Fresh-cut pear
Microbial inactivation
UV-C light
Weibull distribution
Debaryomyces hansenii
Dose range
Fresh-cut
Inactivation kinetics
Inocula
Light treatments
Listeria innocua
Listeria monocytogenes
Log reductions
Microbial populations
Microbicidal effect
Monocytogenes
Strain response
Ultraviolet treatment
Diseases
Escherichia coli
Fruits
Listeria
Microorganisms
Strain
Listeria welshimeri
Pyrus
Zygosaccharomyces
Zygosaccharomyces bailii
Zygosaccharomyces rouxii
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_19355130_v1_n4_p384_Schenk
http://hdl.handle.net/20.500.12110/paper_19355130_v1_n4_p384_Schenk
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
Descripción
Sumario:Ultraviolet energy at a wavelength of 253.7 nm (UV-C) was investigated for its microbicidal effects on pear slices with and without peel. Effectiveness of UV-C light against Listeria innocua ATCC 33090, Listeria monocytogenes ATCC 19114 D, Escherichia coli ATCC 11229, and Zygosaccharomyces bailli NRRL 7256 individual strains was tested in both types of pear slices. In a second experiment, strain cocktails of Listeria (L. innocua ATCC 33090; L. innocua CIP 8011 and L. welshimeri BE 313/01), L. monocytogenes (L. monocytogenes ATCC 19114 D, L. monocytogenes ATCC 7644), and yeasts (Z. bailii NRRL 7256, Zygosaccharomyces rouxii ATCC 52519, and Debaryomyces hansenii NRRL 7268) were also used as inocula and compared with single-strain responses. Inoculated pear slices were exposed to a UV-C dose range between 0 and 87 kJ/m 2 and enumerated to determine log reductions of microbial populations. Overall, as UV-C dose was increased (increasing the time of exposure), more inactivation was observed for all species assayed. UV-C irradiation appeared to improve microbial inactivation in pear slices without peel. In most experiments, great log reduction rates were observed at doses between 0 and 15 kJ/m 2 . Inactivation kinetics was successfully fitted using a Weibullian distribution of resistances model. Narrow frequency shapes strongly skewed to the right were obtained. This model offers improved tools for designing and implementing UV-C light treatment and assessing the impact of some microorganisms' disease. © Springer Science + Business Media, LLC 2007.

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