The Use of UVC-LEDs for the Disinfection of Mycobacterium Tuberculosis

Mathebula, Tshwarelo; Leuschner, F.W.; Chowdhury, S.

doi:10.1109/powerafrica.2018.8521172

Cited by 5 publications

(4 citation statements)

References 11 publications

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“…Low-pressure mercury lamps have been the primary source of UV-C light, but the Minamata Convention on Mercury in January 2020, aimed at reducing mercury use due to health risks 15 . Advances in material science have led to the development of high-intensity UV-C LEDs, a previously unfeasible option due to poor semiconductor quality 23 . UV-C technology is generally not subject to the same stringent legal restrictions that govern the use of many chemical disinfectants.…”

Section: Introductionmentioning

confidence: 99%

Inactivation of Deposited Bioaerosols on Food Contact Surfaces with UV-C Light Emitting Diode Devices

Sharma,

Singh,

Pendyala

et al. 2024

Preprint

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The airborne transmission of infectious diseases and bioaerosol-induced cross-contamination pose significant challenges in the food, dairy, and pharma industries. This study evaluated the effectiveness of 279 nm UV-C LED irradiation for decontaminating bioaerosols, specifically containing microorganisms like E. coli (C3040- Kanamycin resistant), Salmonella Enteritis (ATCC 4931), and Pseudomonas fragi (ATCC 4973), on food contact surfaces. Borosilicate glass, silicon rubber, and stainless steel (316L) surfaces were selected for experimentation for their usage in the food industry. A 50µL cell suspension was aerosolized at 25 psi pressure using a 4-jet BLAM Nebulizer within a customized glass chamber and then deposited onto the surface of the coupons. The serial dilution approach was used for the microbial enumeration, followed by double plating. With a low RMSE and high R2 values, the biphasic kinetic model demonstrated the excellent goodness of fit parameters. At a UV-C dose of 6 mJ cm− 2, glass surfaces showed the maximum microbial inactivation ( i.e. 2.80, 3.81, and 3.56 log CFU/mL for E. coli, Salmonella, and P. fragi, respectively). Stainless steel and silicon rubber showed significant microbial inactivation but were consistently lower than glass. Our research indicates that UV-C LEDs can disinfect bioaerosols on food contact surfaces effectively.

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Section: Introductionmentioning

confidence: 99%

Inactivation of Deposited Bioaerosols on Food Contact Surfaces with UV-C Light Emitting Diode Devices

Sharma,

Singh,

Pendyala

et al. 2024

Preprint

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“…with a wavelength varying from 100 nm to 400 nm. Moreover, the UV rays can be classified as invisible short-wave light [7]. However, the most effective germicidal region of the UV light spectrum is UV type C which has a wavelength that ranges from 100 nm to 280 nm.…”

Section: Introductionmentioning

confidence: 99%

UVC Sanitizing Smart Kit

Tharwat

Alsofiani

Bahdad

et al. 2022

2022 5th International Conference on Computing and Informatics (ICCI)

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During the Coronavirus pandemic, the world counted on conventional sanitizing products that involved unsafe toxic chemicals. Ultraviolet Germicidal Irradiation or ultraviolet disinfection is introduced in many sanitizing applications, as it splits the DNA/RNA, forcing microorganisms unable to spread. For that, ultraviolet disinfection technology is presented in this project to replace the old nonenvironmental practices. Far-ultraviolet type C is a small part of the ultraviolet spectrum, with wavelengths from 207 nm to 222 nm proven effective against micrograms. This project aims to apply farultraviolet technology to design an easily used, reliable, and optimized system to control and monitor the sanitizing operation. Moreover, this project design combines two different sanitizing modes intended to serve the need of a dental clinic's daily sanitizing technique. The first mode is intended to sanitize the dentist's tools connected to a monitoring system that shows the ultraviolet type C intensity and the received dosage. The second mode is for the surfaces and handlers in the clinic; the sanitizing handheld will be attached to a distance identification system that guides the user to apply the sanitizing operation at the proper distance. Furthermore, this project will determine the disinfection parameters (dosage, intensity, exposure time, wavelength, and distance) according to the used far-ultraviolet source and the prototype design.

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“…To combat the highly infectious nature of the global health crisis, e.g., the COVID-19 pandemic disease, many intelligent-manufactured innovations have been launching to prevent infection by applying and integrating high-tech equipment. The wavelength range of 200–280 nm, which emits sufficient energy to shred the DNA or RNA of viruses, is effective in inhibiting bacteria, viruses, and fungi [ 1 , 2 ]. In addition, it can be used to sterilize in air and water or on the surface, showing the effectiveness of UVC when sterilizing indoors [ 3 , 4 ].…”

Section: Introductionmentioning

confidence: 99%

Ultra-Wideband Positioning Sensor with Application to an Autonomous Ultraviolet-C Disinfection Vehicle

Huang

Neo

Chen

et al. 2021

Sensors

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Due to the COVID-19 virus being highly transmittable, frequently cleaning and disinfecting facilities is common guidance in public places. However, the more often the environment is cleaned, the higher the risk of cleaning staff getting infected. Therefore, strong demand for sanitizing areas in automatic modes is undoubtedly expected. In this paper, an autonomous disinfection vehicle with an Ultraviolet-C (UVC) lamp is designed and implemented using an ultra-wideband (UWB) positioning sensor. The UVC dose for 90% inactivation of the reproductive ability of COVID-19 is 41.7 J/m2, which a 40 W UVC lamp can achieve within a 1.6 m distance for an exposure time of 30 s. With this UVC lamp, the disinfection vehicle can effectively sterilize in various scenarios. In addition, the high-accuracy UWB positioning system, with the time difference of arrival (TDOA) algorithm, is also studied for autonomous vehicle navigation in indoor environments. The number of UWB tags that use a synchronization protocol between UWB anchors can be unlimited. Moreover, this proposed Gradient Descent (GD), which uses Taylor method, is a high-efficient algorithm for finding the optimal position for real-time computation due to its low error and short calculating time. The generalized traversal path planning procedure, with the edge searching method, is presented to improve the efficiency of autonomous navigation. The average error of the practical navigation demonstrated in the meeting room is 0.10 m. The scalability of the designed system to different application scenarios is also discussed and experimentally demonstrated. Hence, the usefulness of the proposed UWB sensor applied to UVC disinfection vehicles to prevent COVID-19 infection is verified by employing it to sterilize indoor environments without human operation.

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The Use of UVC-LEDs for the Disinfection of Mycobacterium Tuberculosis

Cited by 5 publications

References 11 publications

Inactivation of Deposited Bioaerosols on Food Contact Surfaces with UV-C Light Emitting Diode Devices

Inactivation of Deposited Bioaerosols on Food Contact Surfaces with UV-C Light Emitting Diode Devices

UVC Sanitizing Smart Kit

Ultra-Wideband Positioning Sensor with Application to an Autonomous Ultraviolet-C Disinfection Vehicle

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