Abstract
Thermosensitive poly(N-isopropylacrylamide)-based polymer particles were synthesised, and screened for the adsorption of human immunoglobulin G (hIgG). At pH 9 the adsorption on microgel particles was strongly affected by temperature, approximately 40 mg hIgG/g support (90% of initial hIgG) being adsorbed at 40°C but only 10% of initial hIgG at 25°C. At pH 5 the maximum adsorbed amount (20 mg hIgG/g support) was similar for both temperatures. The adsorption of hIgG on to charged poly(methyl methacrylate)/poly(N-isopropylacrylamide) core-shell latexes was negligible (5–10 mg hIgG/g support) at the same temperature and pH conditions. The lower adsorption of hIgG onto the core-shell particles is explained by steric interactions due to the small size of the shell.
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Acknowledgements
This work was financed by the Fundação para a Ciência e a Tecnologia (FCT), Portugal, under the projects POCTI/2000/QUI/33866 and POCTI/BIO/45296/2002. A research fellowship to Claudia S.O. Silva is also acknowledged.
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Silva, C.S.O., Baptista, R.P., Santos, A.M. et al. Adsorption of human IgG on to poly(N-isopropylacrylamide)-based polymer particles. Biotechnol Lett 28, 2019–2025 (2006). https://doi.org/10.1007/s10529-006-9188-2
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DOI: https://doi.org/10.1007/s10529-006-9188-2