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Polysaccharide-modified iron oxide nanoparticles as an effective magnetic affinity adsorbent for bovine serum albumin

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Abstract

The magnetic separation technique based on magnetic iron oxide nanoparticles (MNPs) has potential applications in protein adsorption and purification, enzyme immobilization, cell sorting, nucleic acid detachment, and drug release. However, the naked MNPs are often insufficient for their hydrophilicity, colloidal stability, and further functionalization. To overcome these limitations, chitosan was firstly carboxymethylated and then covalently conjugated on the surface of the MNPs ranging in size from about 5 to 15 nm, which were prepared by co-precipitating iron (II) and iron (III) in alkaline solution and then treating under hydrothermal conditions. It was found that such modification did not result in the phase change of the MNPs, and the resultant modified nanoparticles were still superparamagnetic. In particular, the colloidal stability of MNPs in aqueous suspension was improved after the surface modification. By investigating the adsorption of bovine serum albumin (BSA) on the modified MNPs, it was observed that the adsorption capacity of the BSA on the modified MNPs increased rapidly within several minutes and then reached the maximum value at about 10 min. The adsorption equilibrium isotherm could be fitted well by the Langmuir model. The medium pH affected greatly the adsorption of the BSA. The maximum adsorption of the BSA occurred at the pH value close to the isoelectric point of the BSA, with a saturation adsorption amount of 94.45 mg/g (25 °C). For the BSA feed concentration of 1.017 mg/ml, a high desorption percentage of 91.5% could be achieved under an alkaline condition (pH 9.4).

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Acknowledgments

This work was supported by NSFC (20273086; 30470476; 20676155), NSFG (5003252; 039184; 6023103), Department of Science and Technology of Guangdong Province (2004B33101003), and NCET Program (NCET-04-0810) in Universities of China.

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Authors and Affiliations

  1. Laboratory for Polymer Composite and Functional Materials, Institute of Optoelectronic and Functional Composite Materials, School of Chemistry and Chemical Engineering, Sun Yat-Sen (Zhongshan) University, Guangzhou, 510275, China

    Yuan-Yuan Liang, Li-Ming Zhang & Wei Li

  2. Second Affiliated Hospital, Sun Yat-Sen (Zhongshan) University, Guangzhou, 510102, China

    Ru-Fu Chen

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  1. Yuan-Yuan Liang
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  2. Li-Ming Zhang
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  3. Wei Li
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  4. Ru-Fu Chen
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Correspondence to Li-Ming Zhang.

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Liang, YY., Zhang, LM., Li, W. et al. Polysaccharide-modified iron oxide nanoparticles as an effective magnetic affinity adsorbent for bovine serum albumin. Colloid Polym Sci 285, 1193–1199 (2007). https://doi.org/10.1007/s00396-007-1672-2

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  • DOI: https://doi.org/10.1007/s00396-007-1672-2

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