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Hydroxyapatite coating by sol–gel on Ti–6Al–4V alloy as drug carrier

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Abstract

In this study Ti–6Al–4V samples were used as substrates and Ca–P layers were deposited using sol–gel technique and covered by spin-coating. The efficiency of hydroxyapatite (HA) coatings as drug carrier was also evaluated by immersion in gentamicin sulphate solution and the release profiles were obtained by cumulative method of the coating samples. Three non-linear mathematical methods were employed in order to discuss a possible mechanism to lead the drug release. Physical chemical techniques showed the presence of the typical absorption bands of calcium phosphates by infrared spectroscopy while X-ray diffraction peaks matched up with hydroxyapatite patterns. Microstructural techniques (SEM, EDS) help to confirm the hydroxyapatite coating by surface aspect and Ca/P ratio (1.64). The best fitting according statistical results explained each stage of the released profiles and correspond to a mixture of short initial burst effect plus drug dissolution with a specific kinetic and the diffusion of the gentamicin solid particles.

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Acknowledgments

The authors thank the financial support of the cooperative project between CNPq/Brasil and MES/Cuba “Desarrollo de un recubrimiento a base de HAP y polímeros cargados con medicamentos sobre sustratos metálicos”. They also thank the Inorganic Chemistry Department/IQ//UFRJ for UV spectroscopy and Centro Brasileiro de Pesquisa Fisica, CBPF, for infrared spectroscopy and XRD services.

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Authors and Affiliations

  1. Department of Ceramic and Composites, Centro de Biomateriales, Universidad de La Habana, Havana, Cuba

    Eduardo Peón Avés & Gaston Fuentes Estévez

  2. Escola Politécnica Engenharia Metalúrgica e de Materiais, COPPE/UFRJ, Rio de Janeiro, Brazil

    Marcia Soares Sader & Gloria D. Almeida Soares

  3. CENIM, CSIC, Madrid, Spain

    Juan C. Galván Sierra

  4. Institute of Materials Science and Technology, Universidad de La Habana, Havana, Cuba

    Julio C. Llópiz Yurell

  5. Polytechnic Institute, Universidade do Estado do Rio de Janeiro, Nova Friburgo, Rio de Janeiro, Brazil

    Ivan N. Bastos

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  1. Eduardo Peón Avés
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  2. Gaston Fuentes Estévez
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  3. Marcia Soares Sader
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  4. Juan C. Galván Sierra
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  5. Julio C. Llópiz Yurell
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  6. Ivan N. Bastos
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  7. Gloria D. Almeida Soares
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Correspondence to Gaston Fuentes Estévez.

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Avés, E.P., Estévez, G.F., Sader, M.S. et al. Hydroxyapatite coating by sol–gel on Ti–6Al–4V alloy as drug carrier. J Mater Sci: Mater Med 20, 543–547 (2009). https://doi.org/10.1007/s10856-008-3609-9

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  • DOI: https://doi.org/10.1007/s10856-008-3609-9

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