Sharp Photocatalytic TechnologyNews
Sharp’s original Visible Light Responsive Photocatalyst material demonstrated to reduce novel coronavirus (SARS-CoV-2) infectivity titer*1 by more than 99.99% in 2 hours.*2
June 23, 2021
Sharp has demonstrated that the visible light responsive photocatalyst material, originally developed by Sharp, effectively reduces novel coronavirus (SARS-CoV-2), by working in collaboration with Professor Hironori Yoshiyama of the National University Corporation, Department of Microbiology, Shimane University Faculty of Medicine (also, a board member of the Japanese Society for Virology).
In the test, drops of the SARS-CoV-2 solution are put on “glass substrate having Sharp photocatalyst material applied” and “glass substrate without it applied” respectively. Then they are irradiated with 1000lx white LED light in a chamber covered by blackout curtain, and respective infectivity titers were measured after 1 and 2 hours.
The glass substrate with the photocatalyst material applied demonstrated the reduction of viral infectivity titer by more than 98% after 1 hour and more than 99.99% after 2 hours, compared to the glass substrate without it applied, demonstrating definite efficacy.
- *1 Quantity of virus with infectivity
- *2 The virus infectivity titer after 2 hours of light irradiation was compared with the sample without photocatalyst.
Overview of verification test
- Testing Organization
- The National University Corporation, University of Shimane, Faculty of Medicine (located in Izumo City, Shimane Prefecture)
- Glass substrate on which Sharp’s photocatalyst material is applied, and glass substrate without it applied
- Light Source
- White LED
- 1,000 lx
- Validation virus
- Novel Coronavirus (SARS-CoV-2)
- Put drops of SARS-CoV-2 solution on both glass substrates with photocatalyst material applied (hereinafter referred to as “Photocatalyst-processed item”) and without photocatalyst material applied (hereinafter referred to as “Non-photocatalyst-processed item”)
- Leave the following 5 specimens under 1,000 lx white LED for specified amount of time, then collect.
- ① “Initial”
- Collect non-photocatalyst-processed item immediately after creating a sample of it.
- ② “Without photocatalyst 1h”
- Leave non-photocatalyst-processed item under white LED for 1 hour.
- ③ “With photocatalyst 1h”
- Leave photocatalyst-processed item under white LED for 1 hour.
- ④ “Without photocatalyst 2h”
- Leave non-photocatalyst-processed item under white LED for 2 hours.
- ⑤ “With photocatalyst 2h”
- Leave photocatalyst-processed item under white LED for 2 hours.
- Inoculate virus solution which is extracted from the specimen to cells and measure virus infectivity titer using TCID50 assay.
(Left: Test chamber, Right: Measuring viral infectivity titer)
Confirmed effectiveness of reducing viral infectivity titer for SARS-CoV-2
|Initial||Elapsed Time: 1h||Elapsed Time: 2h|
|Virus Infectivity Titer
|With photocatalyst||1.0 x 107||5.6 x 106||1.8 x 106|
|Without photocatalyst||1.0 x 105
[98% or more]
|5.6 x 101
[99.99% or more]
The value in “[ ]” shows the reduction rate of virus infectivity titer compared with non-photocatalyst-processed item (without photocatalyst).