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Trends in Photochemistry & Photobiology   Volumes    Volume 16 
Amino acids photocatalyzed by titanium dioxide can produce secondary hydrogen peroxide
Kazutaka Hirakawa, Takaharu Suzuki
Pages: 63 - 69
Number of pages: 7
Trends in Photochemistry & Photobiology
Volume 16 

Copyright © 2014 Research Trends. All rights reserved

The effect of amino acids on the photocatalytic toxicity of titanium dioxide (TiO2) was investigated. Various amino acids were treated with ultraviolet irradiation along with rutile and anatase types of TiO2 particles. The photooxidized amino acids, especially cysteine, generated hydrogen peroxide in the presence of copper ions during the auto-oxidation process. In the case of aromatic amino acids, hydrogen peroxide formation from photocatalyzed phenylalanine was significantly larger than that from tyrosine. Hydrogen peroxide is a long-lived reactive oxygen species. Furthermore, photocatalyzed amino acids gradually generate hydrogen peroxide. This secondary generation of hydrogen peroxide may play an important role in the cytotoxicity of the TiO2 photocatalyst after photoirradiation.
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