Preparation of L-cysteine modified Au/Fe₃O₄ magnetic composite particle and its adsorption for bovine serum albumin

The L-cysteine modified Au/Fe₃O₄ magnetic composite particles(LC-Au/Fe₃O₄) were synthesized and their adsorption properties for bovine serum albumin(BSA) were investigated. The obtained samples were characterized by UV-Vis spectrophotometer(UV-vis), X-ray diffraction(XRD), Fourier transform infrared spectroscopy(FT-IR), scanning electron microscope(SEM), transmission electron microscope(TEM) and Zeta potential, respectively. The results showed that Fe₃O₄ of LC-Au/Fe₃O₄ has a spinel structure; its diameter was about 200 nm, and the particles showed good stability. The adsorption capacity of LCAu/Fe₃O₄ composite particles for BSA was 161.5 mg/g.