Abstract
The effect of gold nanoparticles on the photooxidation of tryptophan in the presence of porphyrins immobilized on chitosan in the aquatic medium is studied. This reaction is used as a model to assess the sensitizing ability of porphyrins in the photogeneration of singlet oxygen, a process underlying photodynamic therapy, a promising method for treatment of cancer. Gold nanoparticles are prepared by reduction of gold cations with sodium borohydride in the presence of polyvinylpyrrolidone. The proposed technique enables to obtain gold nanoparticles with a very narrow size distribution.
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