Bacteria Decomposition Test - Food Inspection Center of Osaka Hygienic Food Association
Test Procedure:
Pipette 0.2mg of bacteria suspension on a test porcelain tile and a resin plate (50mm×50mm size)
The test substrates are covered with a piece of polyethylene film.
Light of 500 LUX exposes the test glass for 24 hours. The test needs to be conducted in an environment where temperature is a constant 35℃.
Count the number of survived bacteria
In order to convert the number of bacteria in 1 ml, use SCDLP culture medium and measure the number on the test materials by a pour-plate culture way.
Bacteria decomposition test result on photocatalyst resin plate
| Type of Bacteria | Titanium Dioxide | Immediately after illumination (number/ml) | 24 Hours later (number/ml) | % Killed |
| E. coli | Coated | 1.1 x 106 | < 10 | 99.9 % |
| None | 1.1 x 106 | 1.8 x 107 | - | |
| MRSA | Coated | 4.4 x 105 | < 10 | 99.9 % |
| None | 4.4 x 105 | 9.9 x 105 | - | |
| P. aeruginosa | Coated | 2.2 x 105 | < 10 | 99.9 % |
| None | 2.2 x 105 | 2.6 x 106 | - |