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Marti-Muñoz J, Xuriguera E, Layton JW, Planell JA, Rankin SE, Engel E, Castaño O. Feasible and pure P 2O 5-CaO nanoglasses: An in-depth NMR study of synthesis for the modulation of the bioactive ion release. Acta Biomater 2019; 94:574-584. [PMID: 31141734 DOI: 10.1016/j.actbio.2019.05.065] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2019] [Revised: 05/19/2019] [Accepted: 05/24/2019] [Indexed: 12/12/2022]
Abstract
The use of bioactive glasses (e.g. silicates, phosphates, borates) has demonstrated to be an effective therapy for the restoration of bone fractures, wound healing and vascularization. Their partial dissolution towards the surrounding tissue has shown to trigger positive bioactive responses, without the necessity of using growth factors or cell therapy, which reduces money-costs, side effects and increases their translation to the clinics. However, bioactive glasses often need from stabilizers (e.g. SiO44-, Ti4+, Co2+, etc.) that are not highly abundant in the body and which metabolization is not fully understood. In this study, we were focused on synthesizing pure calcium phosphate glasses without the presence of such stabilizers. We combined a mixture of ethylphosphate and calcium 2-methoxyethoxide to synthesize nanoparticles with different compositions and degradability. Synthesis was followed by an in-depth nuclear magnetic resonance characterization, complemented with other techniques that helped us to correlate the chemical structure of the glasses with their physiochemical properties and reaction mechanism. After synthesis, the organically modified xerogel (i.e. calcium monoethylphosphate) was treated at 200 or 350 °C and its solubility was maintained and controlled due to the elimination of organics, increase of phosphate-calcium interactions and phosphate polycondensation. To the best of our knowledge, we are reporting the first sol-gel synthesis of binary (P2O5-CaO) calcium phosphate glass nanoparticles in terms of continuous polycondensated phosphate chains structure without the addition of extra ions. The main goal is to straightforward the synthesis, to get a safer metabolization and to modulate the bioactive ion release. Additionally, we shed light on the chemical structure, reaction mechanism and properties of calcium phosphate glasses with high calcium contents, which nowadays are poorly understood. STATEMENT OF SIGNIFICANCE: The use of bioactive inorganic materials (i.e. bioactive ceramics, glass-ceramics and glasses) for biomedical applications is attractive due to their good integration with the host tissue without the necessity of adding exogenous cells or growth factors. In particular, degradable calcium phosphate glasses are completely resorbable, avoiding the retention in the body of the highly stable silica network of silicate glasses, and inducing a more controllable degradability than bioactive ceramics. However, most calcium phosphate glasses include the presence of stabilizers (e.g. Ti4+, Na+, Co2+), which metabolization is not fully understood and complicates their synthesis. The development of binary calcium phosphate glasses with controlled degradability reduces these limitations, offering a simple and completely metabolizable material with higher transfer to the clinics.
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Affiliation(s)
- Joan Marti-Muñoz
- Biomaterials for Regenerative Therapies, Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology (BIST), 08028 Barcelona, Spain; CIBER en Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), 28029 Madrid, Spain
| | - Elena Xuriguera
- Materials Science and Physical Chemistry Department, University of Barcelona (UB), 08028 Barcelona, Spain
| | - John W Layton
- Department of Chemistry, University of Kentucky (UKY), Lexington, KY 40506-0053, USA
| | - Josep A Planell
- Biomaterials for Regenerative Therapies, Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology (BIST), 08028 Barcelona, Spain; CIBER en Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), 28029 Madrid, Spain
| | - Stephen E Rankin
- Chemical and Materials Engineering Department, University of Kentucky (UKY), Lexington, KY 40506-0053, USA
| | - Elisabeth Engel
- Biomaterials for Regenerative Therapies, Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology (BIST), 08028 Barcelona, Spain; CIBER en Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), 28029 Madrid, Spain; Materials Science and Metallurgy Department (EEBE), Technical University of Catalonia (UPC), 08019 Barcelona, Spain.
| | - Oscar Castaño
- Serra Hunter Fellow, Electronics and Biomedical Engineering Department, University of Barcelona (UB), 08028 Barcelona, Spain; Biomaterials for Regenerative Therapies, Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology (BIST), 08028 Barcelona, Spain; CIBER en Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), 28029 Madrid, Spain; Institute of Nanoscience and Nanotechnology Department, University of Barcelona (UB), 08028 Barcelona, Spain.
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Dos Santos ML, Dos Santos Riccardi C, de Almeida Filho E, Guastaldi AC. Sol-gel based calcium phosphates coatings deposited on binary Ti-Mo alloys modified by laser beam irradiation for biomaterial/clinical applications. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2018; 29:82. [PMID: 29892909 DOI: 10.1007/s10856-018-6091-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2017] [Accepted: 05/24/2018] [Indexed: 06/08/2023]
Abstract
Ti-15Mo alloy samples were irradiated by pulsed Yb: YAG laser beam under air and atmospheric pressure. Calcium phosphate coatings were deposited on the irradiated surfaces by the sol-gel method. The sol was prepared from the precursors Ca (NO3)2.4H2 O and H3 PO4. The modified surfaces were submitted to heat treatment conditions at 350 and 600 °C. The results showed that the two conditions established have a sufficient energy to promote ablation on the laser beam irradiated surfaces. Likewise, it has been demonstrated the processes of fusion and fast solidification from the laser beam irradiation, under ambient atmosphere, inducing the formation of stoichiometric TiO2 and non-stoichiometric titanium oxides, including Ti3O5, TiO, Ti3O and Ti6O with different oxide percentages depending on the fluency used. Besides that, laser modification has allowed a clean and reproducible process, providing no traces of contamination, an important feature for clinical applications. The physico-chemical and morphological properties indicated the formation of a mixture of phases: calcium pyrophosphate, hydroxyapatite and β-TCP for the procedure (PA: calcination temperature), whereas HA (hydroxyapatite) and β-TCP (tricalcium phosphate) were obtained by the procedure (PB: calcination temperature). Therefore, it was possible to obtain a Ti-15Mo alloy surface consisted on calcium phosphate ceramics of biological interest using the procedure (PB). Thus, the laser beam irradiation associated to bioactive coatings of calcium phosphates of biological interest have shown to be promising and economically feasible for use in dental and orthopedic implants.
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Affiliation(s)
- Marcio Luiz Dos Santos
- Center of Natural and Human Sciences, Federal University of ABC - UFABC, 09210-580, Santo André, São Paulo, Brazil.
- Biotechnology and Innovation in Health Program and Master Professional in Pharmacy Program - Anhanguera University of São Paulo (UNIAN - SP), 05145-200, São Paulo, SP, Brazil.
| | - Carla Dos Santos Riccardi
- College of Agricultural Sciences, Paulista State University - UNESP, 18610-307, Botucatu, São Paulo, Brazil
| | - Edson de Almeida Filho
- Institute of Chemistry, 14800-060, Biomaterials Group, Paulista State University - UNESP, Araraquara, Brazil
| | - Antonio C Guastaldi
- Institute of Chemistry, 14800-060, Biomaterials Group, Paulista State University - UNESP, Araraquara, Brazil
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