Abstract
Hybrid materials (HMs) based on a combination of bacterial cellulose (BC) and hydroxyapatite (HA) have demonstrated promising capabilities, especially for bone repair. The insertion of strontium into a BC/HA matrix has a role in the body related to bone remodeling. This study aimed to obtain HMs containing BC/HA doped with strontium ions (Sr2+) by two routes of synthesis, differing in the way strontium was inserted. The HMs produced were characterized to elucidate the morphology and metal/biopolymer interaction, and also strontium adsorption/desorption profiles were evaluated. The biomaterials produced were able to interact with Sr2+, showing a distinct adsorption/desorption profile for each material. BC/CaHA/Sr showed an ion exchange between Ca2+ present in hydroxyapatite by the Sr2+ in solution, characterized by mainly a physisorption mechanism. BC/SrAp demonstrated a chemical bond of Sr2+ on the BC surface by a chemisorption mechanism. The desorption study showed that the Sr release reached a plateau after 11 and 60 days and after 4 months, 91 and 6% of the adsorbed Sr2+ was released by BC/CaHA/Sr and BC/SrAp, respectively. These results suggest that the delivery of Sr2+ can be modulated during bone repair depending on the way Sr2+ is inserted into the hybrid matrix.
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Acknowledgments
The authors would like to thank the Coordination for the Improvement of Higher Education Personnel (CAPES), National Counsel of Technological and Scientific Development (CNPq), Cearense Foundation for the Support of Scientific and Technological Development (FUNCAP), and the Embrapa Agroindústria Tropical for funding this research. This research was also supported by the following projects: FUNCAP/CNPq (PR2-0101-00023.01.00/15), CNPq (No. 305504/2016-9), PROCAD/CAPES (88881.068439/2014-01) and CTQ2015-68951-C3-3R (Ministerio de Economía y Competitividad, Spain and FEDER Funds). A.I.M. thanks the Ministry of Economy and Competitiveness for a Ramón y Cajal contract (RyC2015-17870).
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Luz, E.P.C.G., Borges, M.F., Andrade, F.K. et al. Strontium delivery systems based on bacterial cellulose and hydroxyapatite for guided bone regeneration. Cellulose 25, 6661–6679 (2018). https://doi.org/10.1007/s10570-018-2008-8
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DOI: https://doi.org/10.1007/s10570-018-2008-8