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Surface plasmon resonance in protein covered gold nanoparticles

Gold nanoparticles were prepared by laser ablation in water. Size separation was realized by sedimentation and centrifuging. The interaction of the protein (bull serum albumin - BSA) and gold nanoparticles was investigated in water solution. The obtained samples were characterized by approximation of optical absorption spectra in terms of Drude model for metal cores with dielectric shells.