Bacteria Decomposition Test - Kyoto Microorganism Research Center

Test Procedure:

  1. Pipette 0.2mg of bacteria suspension on a test porcelain tile and a resin plate (50mm×50mm size)

  2. The test substrates are covered with a piece of polyethylene film.

  3.  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℃.

  4. Count the number of survived bacteria

  5. 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 test result on coated tile with TiO2

Type of Bacteria Titanium Dioxide Immediately after illumination (number/ml) 24 hours later (Group 1) 24 hours later (Group 2) Average
E. coli TPX-85 3.5 x 105 < 10 < 10 < 10
None 3.5 x 105 5.0 x 106 6.1 x 106 5.6 x 106
ST. auresu TPX-85 3.5 x 105 < 10 < 10 < 10
None 3.5 x 105 6.1 x 104 6.7 x 104 6.4 x 104