Drastic microbial count reduction in soy milk using continuous short-wave ultraviolet treatments in a tubular annular thin film UV-C reactor
2023
Sauceda Gálvez, Jezer Noe | Codina Torrella, Idoia | Gervilla Fernández, Ramón | Hernández Herrero, María Manuela | Roig Sagués, Artur Xavier | Martínez García, María | Universitat Politècnica de Catalunya. Departament d'Enginyeria Agroalimentària i Biotecnologia | Universitat Politècnica de Catalunya. HorPTA - Horticultura: producció, transformació i aprofitament
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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