UV-C Technology


Ultraloop employs Ultraviolet germicidal irradiation (UVGI) technology to destroy the Covid-19 virus from any surface. UV-C disinfection has gained favor due to its efficacy against a broad range of microbial and viral agents in various environments. UVC is aptly absorbed by RNA and DNA bases leading to molecular structural damage via a process called photodimerization. This process results in the Covid-19 and other pathogen inactivation, so they are no longer able to replicate.


How does UV-C Technology work?

The correct wavelength of ultraviolet must be used for germicidal applications, which cause the pathogen to become deactivated. DNA and RNA are the building blocks of life, including microscopic organisms and pathogens like viruses, bacteria, and molds. Without this genetic material, pathogens are unable to reproduce, eventually leading to the death of an infectious colony. DNA molecules comprise nucleic acids called adenine (A), cytosine (C), guanine (G), and thymine (T). Robust and repeated research has found that when thymine is exposed to specific ultraviolet wavelengths, the molecule absorbs the ultraviolet energy and undergoes a chemical bond change. This change in chemical bond configuration results in an alteration of the DNA sequence, which prevents the pathogen from reproducing. 


Thymine (and Uracil) have absorption spectra that are especially sensitive at wavelengths at or near 265 nanometers. At wavelengths longer than 300 nanometers, there is almost no absorption. Thymine and Uracil are not reactive to UV-A wavelengths, and most UV-B wavelengths except those at or below 300 nanometers. UV-C exposes the DNA and breaks down the hydrogen bond between adenine and thymine. The same happens to the Covid-19 Virus when exposed to UV-C light. The UV rays penetrate the virus shell, reaching its RNA strand and gets absorbed by the RNA nucleotides. A chain of photochemical fusion of two adjacent nucleotides permanently changes the structure of the virus RNA, making it incapable of infecting and living cells.


Can Ultraloop be used for decontaminating PPE such as N95 Mask, eye Goggles, face shields? 

Yes, Ultraloop can be used for masks, eye shields and other PPE that can be put inside the device. Published data on 15 different N95 masks treated with UV-C confirmed that UV-C light could effectively decontaminate virus infection on N95 masks.  A team of scientists from the US evaluated the impact of UV-C On decontaminating 15 different models of N95 models contaminated with H1N1 influenza. Their results [7] showed significant reductions (≥3 log) in influenza viability from the tested N95 masks after treatment with UV-C light clearly establishing the groundwork that N95 masks can be disinfected with UV-C light irradiation. Their data suggested clearly that N95 Mask decontamination and reuse using UV-C can be an effective method. 


A general N95 respiratory mask comprises of four layers of material: (Reference Image 1)

Layer 1: Outer layer of spun-bond polypropylene 

Layer 2: Cellulose/polyester 

Layer 3: Melt-blown polypropylene filter material 

Layer 4: Spun-bound polypropylene. 



A team of scientists from Centers for Disease Control and Prevention CDC (USA) published a detailed scientific paper in 2015 in the journal of Occupational and Environmental Hygiene [8] where they evaluated effects of UV radiation on four models of N95 mask. The team exposed both sides of material coupons and respirator straps from the four N95 masks to UV-C doses from 120–950 J/cm2. The CDC team tested the particle penetration, flow resistance, and bursting strengths of the individual respirator coupon layers, and the breaking strength of the respirator straps to UV-C doses of 120–950 J/cm2. 


Summary of results obtained by CDC team on effect of UV radiation of N95 masks structure and stability. 

The CDC team clearly showed that UV exposure led to a small increase in particle penetration (up to 1.25%) at high UV dosage and had little effect on the flow resistance. The team also showed that at high UV dose the strength of the layers of respirator material was reduced. Such reduction in strength was directly proportional to the UV dose used. 

The UV Dose used in Ultraloop is 50 times to 300 times lower than the UV doses that may impact N95 mask polymers.

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