Abstract
A nanocomposite is prepared by encapsulating silica nano-spheres with polymerized ionic liquid in aqueous medium without use of any organic solvents. Vinyl groups are covalently introduced on to the surface of silica nano-spheres, which are then encapsulated by copolymerization of 1-vinyl-3-ethylimidazolium bromide (monomer) and 1,4-butanediyl-3,3′-bis-l-vinylimidazolium dibromide (cross-linker) at room temperature. The derived nanocomposite, PIL@SiO2, provides a green adsorbent for protein sorption. PIL@SiO2 is selective toward acidic proteins, and its selectivity can be controlled via varying the amount of monomer used in the copolymerization process. At pH 6.0, use of 5 mg PIL@SiO2 nanocomposite results in a sorption efficiency of up to 95 % for 200 mg L−1 ovalbumin in 1 mL sample solution. Electrostatic and hydrophobic interactions between PIL@SiO2 and protein species dominate the adsorption process. The ovalbumin adsorption behavior is consistent with the Langmuir model, giving a sorption capacity of 333.3 mg g−1. The retained ovalbumin is recovered by elution with 0.2 % SDS solution. Circular dichroism spectra reveal virtually no change to the α-helix content of ovalbumin after elimination of SDS by use of dialysis. In summary, high-purity ovalbumin is isolated from chicken egg-white by use of the PIL@SiO2 nanocomposite as adsorbent.
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The authors appreciate financial support from the Natural Science Foundation of China (no. 21105008, 21275027, 21235001), the Program of New Century Excellent Talents in University (NCET-11-0071) and the Fundamental Research Funds for the Central Universities (N110305005, N110705002, and N110805001).
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Han, L., Shu, Y., Wang, X. et al. Encapsulation of silica nano-spheres with polymerized ionic liquid for selective isolation of acidic proteins. Anal Bioanal Chem 405, 8799–8806 (2013). https://doi.org/10.1007/s00216-013-7295-1
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DOI: https://doi.org/10.1007/s00216-013-7295-1