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Borges R, Kai KC, Lima CA, Zezell DM, de Araujo DR, Marchi J. Bioactive glass/poloxamer 407 hydrogel composite as a drug delivery system: The interplay between glass dissolution and drug release kinetics. Colloids Surf B Biointerfaces 2021; 206:111934. [PMID: 34182428 DOI: 10.1016/j.colsurfb.2021.111934] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Revised: 05/31/2021] [Accepted: 06/18/2021] [Indexed: 12/15/2022]
Abstract
Since patients suffer pain in the post-surgery of bone repair interventions, bioactive glass/hydrogel drug delivery systems containing local anesthetics, such as ropivacaine, could improve patient life quality by combining bone regeneration with anesthetics. However, poloxamer-based hydrogel properties are sensitive to ions, temperature, and water contents and could be structurally influenced by the ionic dissolution products from bioactive glasses of different compositions. Therefore, this study evaluated the interplay between bioactive glass dissolution kinetics and poloxamer 407 properties, establishing a correlation between changes in the hydrogel and drug release kinetics. Three glass compositions were produced, yielding Ca-rich, Na-rich, and an intermediate glass composition. The influence of Ca/Na ratios on the glass structure and dissolution was investigated. Further, the glasses and ropivacaine were incorporated in the poloxamer hydrogel, and the self-assembly ability of poloxamer, the degradation rate, and the drug release kinetics of the composites were evaluated. The results suggested that glass connectivity affected the early-stage of glass dissolution, while sodium mobility influenced the long-term. The dissolution products from the glasses interact with the supramolecular structure of the poloxamer, causing structural changes responsible for hydrogel degradation. Consequently, by changing the Ca/Na ratio in the glasses, it is possible to modulate glass dissolution that, in turn, influences the ropivacaine release. Thus, we propose that the Ca/Na ratio in quaternary bioactive glasses can be used to modulate drug-delivery properties from systems based on bioactive glasses and poloxamer 407.
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Affiliation(s)
- Roger Borges
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Avenida Estados Unidos 5001, Bairro Bangu, Santo André, SP, Brazil.
| | - Karen C Kai
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Avenida Estados Unidos 5001, Bairro Bangu, Santo André, SP, Brazil.
| | - Cassio A Lima
- Centro de Lasers e Aplicações, Instituto de Pesquisas Energéticas e Nucleares, Avenida Prof. Almeida Prado 2242, Butantã, São Paulo, SP, Brazil; Institute of Integrative Biology, University of Liverpool, Crown Street, Liverpool, L69 7ZB, United Kingdom.
| | - Denise M Zezell
- Centro de Lasers e Aplicações, Instituto de Pesquisas Energéticas e Nucleares, Avenida Prof. Almeida Prado 2242, Butantã, São Paulo, SP, Brazil.
| | - Daniele R de Araujo
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Avenida Estados Unidos 5001, Bairro Bangu, Santo André, SP, Brazil.
| | - Juliana Marchi
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Avenida Estados Unidos 5001, Bairro Bangu, Santo André, SP, Brazil.
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Côté AS, Cormack AN, Tilocca A. Influence of Calcium on the Initial Stages of the Sol-Gel Synthesis of Bioactive Glasses. J Phys Chem B 2016; 120:11773-11780. [PMID: 27809532 DOI: 10.1021/acs.jpcb.6b09881] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Understanding how calcium interacts with silica sources and influences their polycondensation in aqueous solutions is of central importance for the development of more effective biomaterials by sol-gel approaches. For this purpose, the atomic-scale evolutions of a calcium-containing precursor solution corresponding to a typical sol-gel bioactive glass and of a corresponding Ca-free solution were compared using reactive molecular dynamics simulations. The simulations highlight a significantly faster rate of condensation when calcium is present in the initial solution, resulting in the formation of large and ramified silica clusters within 5 ns, which are absent in the Ca-free system. This different behavior has been analyzed and interpreted in terms of the Ca-induced nanosegregation in calcium-rich and silica-rich regions, which promotes the condensation reactions within the latter. By identifying a possible mechanism behind the limited incorporation of calcium in the silica nanoclusters formed in the early stages of the sol-gel process, these results could guide further studies aimed at identifying favorable experimental conditions to enhance initial calcium incorporation and thus produce sol-gel biomaterials with improved properties.
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Affiliation(s)
- Alexander S Côté
- Department of Chemistry, University College London , London WC1H 0AJ, United Kingdom
| | - Alastair N Cormack
- New York State College of Ceramics, Alfred University , Alfred, New York 14802, United States
| | - Antonio Tilocca
- Department of Chemistry, University College London , London WC1H 0AJ, United Kingdom
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