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Title Polydopamine modified TiO2 nanotube arrays for long-term controlled elution of bivalirudin and improved hemocompatibility
Date 28.10.2017
Number 53701
Abstract Sustained and controllable release characteristics are pivotal factors for novel drug delivery technologies. TiO2 nanotube arrays prepared by self-ordering electrochemical anodization are attractive for the development of biomedical devices for local drug delivery applications. In this work, several layers of polydopamine (PDA) were deposited to functionalize TiO2 nanotube arrays. The anticoagulant drug bivalirudin (BVLD) was used as a model drug. PDA extended the release period of BVLD and maintained a sustained release kinetic. Depending on the number of PDA layers, the release characteristics of BVLD improved, as there was a reduced burst release (from 45% to 11%) and extended overall release period from 40 days to more than 300 days in the case of 5 layers. Besides, the BVLD loaded 5-layer PDA coating maintained the high bioactivity of BVLD and effectively reduced the thrombosis formation by inhibition of the adhesion and denaturation of fibrinogen, platelets, and other blood components. Both in vitro and ex vivo blood evaluation results demonstrated that this coating significantly improved the hemocompatibility. These results confirmed the capability of PDA fitted TiO2 nanotube systems to be applied for local drug delivery over an extended period with well retained bioactivity and predictable release kinetics.
URL http://dx.doi.org/10.1021/acsami.7b06108
Publisher ACS Applied Materials & Interfaces
Identifier 0
Citation ACS Applied Materials & Interfaces (2017) Article ASAP
DOI http://dx.doi.org/10.1021/acsami.7b06108
Authors Yang, Y. ; Li, X. ; Qiu, H. ; Li, P. ; Qi, P. ; Maitz, M.F. ; You, T. ; Yang, Z. ; Tian, W. ; Huang, N.
Tags bvld hemocompatibility long-term drug release polydopamine tio2 nanotube

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