Abstract
The effect of CdS nanoparticles on the properties of a protein matrix, R-phycoerythrin, has been studied using absorption and fluorescence spectroscopy techniques, atomic force microscopy, confocal fluorescence microscopy, and analytical ultracentrifugation. The results demonstrate that CdS nanoparticles distort the native state of R-phycoerythrin, as evidenced by the reduction in absorption, partial fluorescence quenching, the reduction in fluorescence lifetime from 2.9 to 1.9 ns in solution and the increase to 3.3 ns upon adsorption on glass, and the influence of CdS nanoparticles on the sedimentation coefficient distribution of R-phycoerythrin. We conclude that a CdS nanoparticle synthesized inside an R-phycoerythrin molecule influences the chromophore—chromophore interaction and stabilizes the hexamer form of the protein.
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