  Photoirradiation of silver nanoparticles in water solution of NaNO3 (0.01M)
and in dissolved DNA was investigated by spectrophotometric and thermodynamic
kinetic approaches. It is shown that only the irradiated complexes AgNPs-DNA
have distinctly expressed isosbestic point. The test with the free AgNPs
demonstrates that as a result of photo-irradiation desorption of silver atoms
and their oxidation takes place. We have also observed that at
photo-irradiation of the complexes by AgNPs-DNA desorption of silver atoms from
the surface of AgNPs takes place. Kinetic study of photo-desorption of silver
atoms has allowed to estimate desorption rate constant and the heat of
adsorption for free AgNPs and AgNPs bound with DNA. On DNA example toxicity of
AgNPs at their application to photo-chemo and photo-thermo therapy of cancer is
discussed.
