Drastic microbial count reduction in soy milk using continuous short-wave ultraviolet treatments in a tubular annular thin film UV-C reactor
Vegetative cells of Listeria monocytogenes and Escherichia coli and spores of Bacillus subtilis and Aspergillus niger were inoculated in soy milk at an initial concentration of ˜5 log CFU/mL. Inoculated and control (non-inoculated) soy milk samples were submitted to three types of treatments using a...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2023 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/400114 |
| Acceso en línea: | https://hdl.handle.net/2117/400114 https://dx.doi.org/10.3390/foods12203813 |
| Access Level: | acceso abierto |
| Palabra clave: | Radiation preservation of food. Listeria monocytogenes Escherichia coli Bacillus subtilis Aspergillus niger soy milk short-wave ultraviolet (UV-C) Aliments--Irradiació Àrees temàtiques de la UPC::Enginyeria agroalimentària::Indústries agroalimentàries::Tecnologia dels aliments |
| Sumario: | Vegetative cells of Listeria monocytogenes and Escherichia coli and spores of Bacillus subtilis and Aspergillus niger were inoculated in soy milk at an initial concentration of ˜5 log CFU/mL. Inoculated and control (non-inoculated) soy milk samples were submitted to three types of treatments using a tubular annular thin film short-wave ultraviolet (UV-C) reactor with 1 mm of layer thickness. Treatments applied depended on the flow rate and the number of entries to the reactor, with UV-C doses ranging from 20 to 160 J/mL. The number of entries into the reactor tube (NET) was established as the most determining parameter for the efficiency of the UV-C treatments. Conidiospores of A. niger were reported as the most resistant, followed by B. subtilis spores, while vegetative cells were the most sensible to UV-C, with Listeria monocytogenes being more sensible than Escherichia coli. Treatments of just 80 J/mL were needed to achieve a 5 log CFU/mL reduction of L. monocytogenes while 160 J/mL was necessary to achieve a similar reduction for A. niger spores |
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