Abstract
Nickel nanoparticles (NNPs) synthesized by a modified polyol method using ethylene glycol as a reducing agent, palladium chloride as a nucleating agent, and polyvinylpyrrolidone (PVP) as a protective agent were investigated as a potential magnetic adsorbent for the purification of hexahistidine-tagged (His6-tagged) recombinant proteins. The synthesis resulted in nanoparticles having an average diameter of 68 ± 28 nm. The x-ray diffraction pattern confirmed the presence of nickel metal, as well as the presence of unreacted nickel (II) hydroxide Ni(OH)2. Magnetic characterization showed that a magnetization saturation of 39.3 electromagnetic unit (emu)/g at 20,000 Oersted (Oe) was reached rapidly and that the material exhibited ferromagnetic behavior. Protein purification results showed that the synthesized NNPs were highly selective for binding to a His6-tagged recombinant protein single-domain antibody ToxA5.1. In addition, NNPs were used for four adsorption cycles without significant binding capacity losses. These particles have shown great potential such as being easily synthesized, cost-effective, and highly selective magnetic adsorbents for the purification of His6-tagged recombinant proteins.
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ACKNOWLEDGMENTS
The authors wish to thank Dr. Yun Liu for the SEM pictures, Dr. Tara Kell for the XRD scan, and Dr. Muralee Murugesu’s laboratory for the SQUID measurements. Financial support from the Natural Science and Engineering Council of Canada (NSERC) and Canadian Foundation of Innovation (CFI) is gratefully acknowledged.
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Parisien, A., Al-Zarka, F., Hussack, G. et al. Nickel nanoparticles synthesized by a modified polyol method for the purification of histidine-tagged single-domain antibody ToxA5.1. Journal of Materials Research 27, 2884–2890 (2012). https://doi.org/10.1557/jmr.2012.323
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DOI: https://doi.org/10.1557/jmr.2012.323