An innovative water-assisted UV-C disinfection system to improve the safety of strawberries frozen under cryogenic conditions
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Strawberries inoculated with Salmonella enterica, Listeria monocytogenes (108 CFU/mL, 50 μL) and murine norovirus (MNV-1; 106 TCID50/mL, 50 μL), were washed for 2 min in a water-assisted UV-C light tank (WUVC) combined or not with 40 mg/L of peracetic acid (WUVC+PA), and 200 mg/L of free chlorine solution (NaClO) with the UV-C lamps switched off. Moreover, a ‘conventional’ dry UV-C treatment (DUVC) was also tested. After 2-min exposure, washing sanitization with chemical agents gave the highest reduction for both bacteria (ca. ≥ 3.3 log CFU/g) and MNV-1 (≥1.8 log TCID50/mL). DUVC treatment proved to be the least effective technology (≤0.6 log CFU/g for bacteria and 1.5 log TCID50/mL for MNV-1). Regarding wash water, no presence of L. monocytogenes and S. enterica were reported with WUVC+PA and NaClO sanitization. After disinfection, samples were frozen at −70 ± 2 °C in a cryogenic freezing cabinet with liquid nitrogen (N2). For both pathogens, frozen storage after washing substantially enhanced their inactivation in the first 3 days (1.1–4.9 log UFC/g) compared to the reductions obtained the following sampling points (0.0–0.8 log UFC/g). After 90 days, L. monocytogenes and S. enterica were not detected on the samples treated with water-assisted methodologies (WUVC, WUVC+PA and NaClO treatments), whilst MNV-1 was little affected. Further studies are needed to improve norovirus inactivation on frozen strawberries.
663/664 - Aliments i nutrició. Enologia. Olis. Greixos
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Innovative Food Science and Emerging Technologies
Ortiz-Solà, J., I. Viñas, I. Aguiló-Aguayo, G. Bobo, and M. Abadias. 2021. "An Innovative Water-Assisted UV-C Disinfection System To Improve The Safety Of Strawberries Frozen Under Cryogenic Conditions". Innovative Food Science & Emerging Technologies 73: 102756. doi:10.1016/j.ifset.2021.102756.
Grant agreement number
MINECO/Programa Estatal de I+D+I orientada a los retos de la sociedad/AGL2016-78086-R/ES/ESTRATEGIAS DE MITIGACION DE LOS PROBLEMAS ASOCIADOS A PATOGENOS DE TRANSMISION ALIMENTARIA PARA MEJORAR LA CALIDAD E INOCUIDAD DE FRESAS CONGELADAS Y LISTAS PARA EL CONSUMO/
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