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Open Access Nano Express

Synthesis of new type of Au-magnetic nanocomposite and application for protein separation thereof

Yu Song12, Ling Tao2 and Xiangchun Shen2*

Author Affiliations

1 Department of Pharmacy, Third Affiliated Hospital of Southern Medical University, Guangzhou 510630, China

2 Research Division of Pharmacology, Guiyang Medical College, Guiyang 550004, China

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Nanoscale Research Letters 2012, 7:369  doi:10.1186/1556-276X-7-369

Published: 3 July 2012


We present a different strategy for synthesizing the Au-γ-Fe2O3 bifunctional nanoparticle by using a larger (50 nm) Au nanoparticle as the core surrounded by smaller (10 nm) γ-Fe2O3 nanoparticles. The synthesis of the composite nanoparticles is quite facile based on a simple redox process whereby Fe2+ is used to reduce Au3+. The morphology and composition of the product is measured by transmission electron microscopy, X-ray powder diffraction and UV–vis spectroscopy. We demonstrate the utility of these as-prepared Au-γ-Fe2O3 nanoparticles by showing they can be used to separate proteins in solution. For example, bovine serum is efficiently removed from an aqueous solution with the simple addition of the NPs and application of a small magnet. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis is performed to evaluate the fidelity and efficiency of the protein separation procedure.

Gold; Magnetic; Bifunctional; Protein separation; Nanoparticle