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Poly(ethylene Oxide)-Modified Polyaspartamide–Ferrocene Conjugates

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Abstract

In continuation of earlier investigations of polymer–ferrocene conjugates for biomedical applications, this article deals with conjugates prepared by N-acylation of linear, amine-functionalized polyaspartamide carriers with 4-ferrocenylbutanoic acid. Acylation is brought about both by mediation of HBTU coupling agent and by the N-hydroxysuccinimide active ester method. The polymeric carriers contain oligo- or poly(ethylene oxide) side chains introduced here for enhancement of water solubility. The longer side chains, in addition, are to impart such biomedically important properties as increased resistance to uptake by the reticuloendothelial system and to protein binding, extended circulation life time, and lowered immunogenicity. The conjugates comprise from 10 to 25 mol% ferrocenylated subunits, corresponding to ca. 2–5% Fe by mass. Freshly prepared and isolated in the solid state, they dissolve smoothly in aqueous media, with upper concentration limits (>0.2g/ml) dictated solely by their viscosity behavior. The conjugates are of interest in biomedical applications.

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Authors and Affiliations

  1. Department of Chemistry, University of the Witwatersrand, Wits 2050, Republic of South Africa

    Maria G. Meirim, Eberhard W. Neuse & Gregg A. Caldwell

Authors
  1. Maria G. Meirim
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  2. Eberhard W. Neuse
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  3. Gregg A. Caldwell
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Meirim, M.G., Neuse, E.W. & Caldwell, G.A. Poly(ethylene Oxide)-Modified Polyaspartamide–Ferrocene Conjugates. Journal of Inorganic and Organometallic Polymers 7, 71–91 (1997). https://doi.org/10.1023/A:1021488110997

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