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Join Date: Jan 2021
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Is UVC Light Effective for Bacteria and Virus?

03/15/2021 5:20 AM

How effective is UV sterilization? Is it effective against bacteria and viruses? What are the advantages and disadvantages? These are the questions I often hear in the field of microbiology, especially when people think about how dirty their phones are. As more and more UV germicidal products are put on the market, you may wonder if they are worth trying. So, let's delve into it!

Ultraviolet rays have been used for sterilization and disinfection as early as the middle of the 20th century. With the advancement of technology, especially the development of UV bulbs themselves, their reliable long life (thousands of hours) and smaller size (for example, UV LEDs compared with traditional UV bulbs) have expanded their use range. You will find it can be used to disinfect: water, air, fruits, vegetables, surgical appliances, tablets, toys and various surfaces.

When it comes to ultraviolet sterilization, not all types of ultraviolet rays are effective. what does that mean? In order to obtain some technical information, ultraviolet (UV) means "beyond violet light" and refers to a series of electromagnetic waves whose wavelength (shorter than the violet light of visible light) (higher frequency and energy). There are three types of ultraviolet rays, which have reduced wavelength and increased energy. They are UVA, UVB and UVC. For ultraviolet sterilization, only ultraviolet rays (100-280nm), such as 265~278 uvc rays and 222nm far uvc rays, have enough energy to effectively kill microorganisms. When you buy ultraviolet germicidal products to try in your home or business, please make sure that the ultraviolet wavelength is within the range of UVC (100-280 nm). Is UV sterilization effective against viruses and bacteria? The short answer is yes, there are even more creatures. Studies have shown that UVC at 254 nm is effective against all food-borne pathogens, natural microbiota, molds and yeasts. Because the size and shape of microorganisms are different, they will affect their UV absorption, so the time required to kill each species will be different.

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Re: Is UVC Light Effective for Bacteria and Virus?

03/15/2021 5:43 AM

<...Ultraviolet rays have been used for sterilization and disinfection as early as the middle of the 20th century....>

One might wonder why this thread is in the New Technologies & Research section.

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