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Polyamido amine (PAMAM)-grafted magnetic nanotubes as emerging platforms for the delivery and sustained release of silibinin

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Abstract

This work reports the synthesis of surface-modified iron oxide magnetic nanotubes (Fe3O4NT) with poly(amido amine) dendrimers of the third generation (PAMAM-G3) as novel nanomaterials for potential drug-delivery applications. Fe3O4NT were obtained by reduction of α-Fe2O3 nanotubes, which were synthesized following a hydrothermal strategy using SO4 2−/H2PO4 − to control the size and morphology of the prepared materials. Fe3O4NT were further functionalized with PAMAM-G3 moieties using a silane coupling agent. Pristine and PAMAM-modified Fe3O4NT were characterized through TEM, FTIR, XRD, N2 adsorption–desorption isotherms and VSM measurements, which confirmed the nanotubular morphology and magnetic behavior for both systems, and TGA analyses, which revealed a PAMAM grafting percentage of 16.8%. The effect of PAMAM conjugation on the adsorption and release properties of Fe3O4NT was examined using silibinin as model poorly soluble drug compound. Our results revealed that PAMAM grafting increased the maximum amount of adsorbed drug from 675 mg g−1 in pristine Fe3O4NT to 825 mg g−1 in PAMAM-Fe3O4NT. These quantities exceed by far the drug-loading capacity of other pristine and PAMAM-modified nanotubular systems, which constitutes a relevant outcome for the present study.

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Acknowledgements

Authors thank FONDECYT under Grant No. 1130531. CD thanks CONICYT for her doctoral fellowship.

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Authors and Affiliations

  1. Facultad de Ciencias Químicas, Universidad de Concepción, Edmundo Larenas 129, Concepción, Chile

    Gloria Chávez, Cristian H. Campos, Carola Díaz & Joel B. Alderete

  2. Departamento de Ciencias Químicas, Facultad de Ciencias Exactas, Universidad Andres Bello, Sede Concepción, Autopista Concepción-Talcahuano, 7100, Talcahuano, Chile

    Verónica A. Jiménez & Cecilia C. Torres

  3. iMdea-Nanociencia, Campus Universitario de Cantoblanco, 28049, Madrid, Spain

    Gorka Salas

  4. Departamento de Fisiología, Facultad de Ciencias Biológicas, Universidad de Concepción, 403901, Concepción, Chile

    Leonardo Guzmán

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  1. Gloria Chávez
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  2. Cristian H. Campos
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Chávez, G., Campos, C.H., Jiménez, V.A. et al. Polyamido amine (PAMAM)-grafted magnetic nanotubes as emerging platforms for the delivery and sustained release of silibinin. J Mater Sci 52, 9269–9281 (2017). https://doi.org/10.1007/s10853-017-1140-4

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