Catalysis Induced by Other Nanoparticles

1 Eiectrocataiytic Activity of Titanium Dioxide Nanoparticle Labels 

Metal oxides are emerging as important materials because of their versatile properties such as high-temperature superconductivity. 

The advances in hybrid nanotechnology involving nucleic acids are mostly linked with sequence-specific nucleic acid interactions. Ti02-oligonucleotide nanocomposites retain the intrinsic photocat-alytic capacity of Ti02 as well as the bioactivity of the oligonucleotide DNA therefore, the developments in this area have been oriented toward cellular imaging and protein or DNA sensor microarrays [38]. 

Lo et al. [38] reported a nanocomposite biosensor for the amperometric detection of H2O2 based on thionin incorporated bilayer of DNA/nano-Ti02 film-modified electrode. Furthermore, this system showed electrocatalytic activity toward the O2 and H2O2 reduction in physiological conditions. 

A nano-Ti02 substrate in combination with Au-NP-modified DNA probe was used by Lu et al. [40] to develop a novel photoelectrochemical method for quantitative detection of the linear DNA hybridization. In the detection process schematized in 

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