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Novel Technologies for Preserving Ricotta Cheese: Effects of Ultraviolet and Near-Ultraviolet-Visible Light
Emilio Francesco Ricciardi1, Selene Pedros-Garrido2, Kostas Papoutsis2
1Department of Agricultural Sciences, Food and Environment, University of Foggia, Via Napoli, 25-71122 Foggia, Italy.
Abstract:
Ricotta cheese is a potential growth medium for a wide range of microorganisms. The aim of the current study was to investigate the efficacy of ultraviolet (UV-C) and near-ultraviolet-visible light (NUV-vis) in microbial decontamination of ricotta artificially inoculated with Pseudomonas fluorescens. Cheese samples were stored at 4 °C, and microbiological and sensory analyses were performed for 9 days. From the microbiological point of view, control samples became unacceptable after less than 5 days, whereas ricotta treated by both UV-C and NUV-vis light remained acceptable for more than 6 days. Similar effects of UV-C and NUV-vis light were also recorded in terms of sensory quality. The shelf life of the samples subjected to the treatments was thus extended by 50%, suggesting the potential application of UV-C and NUV-vis light for cheese decontamination.
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