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Radiation and filtration are essential tools for microbial control, targeting microorganisms through distinct mechanisms. Radiation eliminates microbes by damaging their DNA, either killing them or inhibiting their growth. Based on wavelength, radiation is classified into two types: nonionizing and ionizing radiation.Non-ionizing radiation, such as UV radiation (200–400 nm), is absorbed by DNA, causing defects that effectively disinfect surfaces, air, and water, including safety cabinets.
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Disinfecting Slush Machines by an Innovative Near Ultraviolet Light Emitting Diode (UV LED) Technological System.

C Salini1, D Amodeo2, G Cevenini2

  • 1Post Graduate School of Public Health, Department of Molecular and Developmental Medicine, University of Siena, Italy.

Annali Di Igiene : Medicina Preventiva E Di Comunita
|December 8, 2022
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Near-ultraviolet (nUV) LED light effectively reduces microbial contamination in slush machines. Optimizing parameters like exposure time and distance enhances the effectiveness of this innovative food safety technology.

Keywords:
Food contaminationFood controlFoodborne diseaseUV technologynUV system

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Area of Science:

  • Food Science
  • Microbiology
  • Public Health

Background:

  • Microbial contamination of food and beverages poses a significant public health concern.
  • Innovative technologies, particularly those utilizing ultraviolet (UV) light, are being explored to mitigate contamination risks.
  • Slush machines are potential sources of microbial contamination in food service environments.

Purpose of the Study:

  • To evaluate the efficacy of a near-ultraviolet (nUV) LED device, operating at 405 nm, in reducing microbial contamination within slush machines.
  • To assess the practical application and effectiveness of nUV LED technology in a real-world food service setting.

Main Methods:

  • A nUV LED device with a 408 nm wavelength was installed and operated on slush machines.
  • Inner tank walls were intentionally contaminated with slush to simulate real-world conditions.
  • Microbial reduction was assessed over time in relation to the nUV LED light source.

Main Results:

  • A statistically significant logarithmic reduction in microbial load was observed.
  • The effectiveness of nUV radiation was dependent on the distance from the light source.
  • Key parameters influencing microbial reduction include exposure time, light power, wavelength, distance, and obstacles.

Conclusions:

  • nUV LED technology shows significant promise for reducing microbial contamination in food and beverage applications.
  • Proper management of operational parameters is crucial for maximizing the effectiveness of nUV decontamination.
  • Implementing nUV technology is a vital precautionary measure to reduce the incidence of foodborne diseases.