Before the demonstration, we determined the efficacy of disinfection as a function of irradiation wavelength (action spectra) by constructing a wavelength tunable DUV light source. Here, we show our recent progress in the instantaneous purification of contaminated water by combining the point-source characteristics of DUV-LEDs with a water waveguide (WW). Few studies have used the point-source characteristics of LEDs and have instead replaced mercury vapor lamps with LEDs. As an emerging technology, purification by deep ultraviolet light-emitting diodes (DUV-LEDs) is promising. Ultraviolet (UV) radiation treatment is an effective method for purifying pollutant water contaminated with bacteria and/or chemicals. This study suggested that UVĮxposure triggered growth inhibition, cytogenotoxicity, oxidative stress, and meristematic cell damages in A. Observed in this study were more severe in cells treated with UV-C compared to UV-A. All of the physiological, biochemical, cytogenetic, and anatomical damages Anatomical damages such as epidermis cell damage, cortex cell damage, necrotic zones, giant cell nucleus, and indistinct transmission MN and CAs were observed in root tip cells, indicating the cytogenotoxic effect of UV application. A decrease in MI and an increase in the frequency of Induction of SOD and CAT enzymes in root meristematic cells. Both UV treatments caused a significant increase in MDA levels and UV treatments caused significant reductions in growth-related parameters. Also,Īnatomical changes induced by UV-A and UV-C were analyzed in root meristematic cells. Malondialdehyde (MDA) and the total activities of superoxide dismutase (SOD) and catalase (CAT) enzymes. Oxidative stress due to UV application was investigated based on the accumulation of Of UV was investigated with respect to germination percentage, total weight gain, and root elongation, while cytogenotoxicity arisen from UV exposure was analyzed using mitotic index (MI) and chromosomal aberration (CA) and Of the other groups was exposed to 254 nm (UV-C) and the other to 365 nm (UV-A) UV. Three groups were formed from Allium bulbs, one of which was the control group. The effects of twoĭifferent types of UV on some physiological, biochemical, cytogenotoxic, and anatomical parameters were investigated in a multifaceted study. With the purpose of evaluating the damages of UV-A and UV-C radiations in Allium cepa L. Widespread use in sterilization processes, especially against the SARS-CoV-2 virus. Organisms are increasingly exposed to ultraviolet (UV) rays of sunlight, due to the thinning of the ozone layer and its This study helps to understand how specific factors (e.g., spatial arrangement of cells fluctuating fungal loads on packaging devices) can influence the UV-C LED system performance and therefore could be useful for both plant manufacturers and food industries to develop tailored UV-C LED systems. Industrial relevance: This study provides data on the behaviour of two different UV-C LED systems in inactivating fungal conidia on polyethylene terephthalate surfaces. Given the low fungal contamination of food packaging devices and the possibility of developing tailored LED systems, UV-C LED technology was confirmed as an interesting method of sanitization for food packaging. brevicompactum) when a multilayer was tested. brevicompactum were inactivated within 5 s when a single layer was used, whereas their 1D-values were equal to 2–4 s (H. brasiliensis was the most resistant fungus to the effects of UV-C LED irradiation, with its 1D-value varying from 23 to 58 s (9.0 mW/cm²) and 46–58 s (5.5 mW/cm²) regardless of the light source used or the type of inoculum. Fungal conidia were deposited on polyethylene terephthalate lids as either a single (4–5 log CFU/lid) or a multiple layer of cells (5–6 log CFU/lid) to evaluate any difference due to a potential “shadow effect”. The UV-C LED systems were used at two distinct light intensities (9.0 mW/cm² and 5.5 mW/cm²) for up to 800 s. The present study aimed to assess the effects of two UV-C LED systems on three food-spoilage fungi (Hyphopichia burtonii, Penicillium brevicompactum, Aspergillus brasiliensis) that contaminate food packaging materials.
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