Volume 17, Issue 2 1600156
Full Paper

Angiogenic Rg1/Sr-Doped TiO2 Nanowire/Poly(Propylene Fumarate) Bone Cement Composites

Mehrnaz Salarian

Mehrnaz Salarian

Biomedical Engineering Graduate Program, University of Western Ontario, 1151 Richmond Street, London, ON, N6A 5B9 Canada

The Ontario Ginseng Innovation & Research Consortium, 1151 Richmond Street, London, ON, N6A 5B9 Canada

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William Z. Xu

William Z. Xu

Department of Chemical and Biochemical Engineering, University of Western Ontario, 1151 Richmond Street, London, ON, N6A 5B9 Canada

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Richard Bohay

Richard Bohay

Schulich School of Medicine and Dentistry, University of Western Ontario, 1151 Richmond Street, London, ON, N6A 5B9 Canada

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Edmund M. K. Lui

Edmund M. K. Lui

The Ontario Ginseng Innovation & Research Consortium, 1151 Richmond Street, London, ON, N6A 5B9 Canada

Department of Physiology and Pharmacology, University of Western Ontario, 1151 Richmond Street, London, ON, N6A 5B9 Canada

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Paul A. Charpentier

Corresponding Author

Paul A. Charpentier

Biomedical Engineering Graduate Program, University of Western Ontario, 1151 Richmond Street, London, ON, N6A 5B9 Canada

Department of Chemical and Biochemical Engineering, University of Western Ontario, 1151 Richmond Street, London, ON, N6A 5B9 Canada

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First published: 12 September 2016
Citations: 12

Abstract

A new approach is provided for preparing radiopaque and angiogenic poly(propylene fumarate) (PPF) bone cements by integrating Sr-doped n-TiO2 nanowires and ginsenoside Rg1 suitable for treating osteonecrosis. High aspect ratio radiopaque TiO2-nanowires are synthesized by strontium doping in supercritical CO2 for the first time, showing a new phase, SrTiO3. PPF is synthesized using a transesterification method by reacting diethyl fumarate and propylene glycol, then functionalized using maleic anhydride to produce terminal carboxyl groups, which are subsequently linked to the nanowires. The strong interfacial adhesion between functionalized PPF and nanowires is examined by scanning electron microscopy, Fourier transform infrared, X-ray photoelectron spectroscopy, thermal analysis, and mechanical testing. An angiogenic modulator, ginsenoside Rg1, is integrated into the bone cement formulation with the mechanical properties, radiopacity, drug release, and angiogenesis behavior of the formed composites explored. The results show superior radiopacity and excellent release of ginsenoside Rg1 in vitro, as well as a dose-dependent increase in the branching point numbers. The present study suggests this new methodology provides sufficient mechanical properties, radiopacity, and angiogenic activity to be suitable for cementation of necrotic bone.

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