Local structures of mesoporous bioactive glasses and their surface alterations in vitro: inferences from solid-state nuclear magnetic resonance.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
Philips N GunawidjajaMattias Edén

Abstract

We review the benefits of using (29)Si and (1)H magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy for probing the local structures of both bulk and surface portions of mesoporous bioactive glasses (MBGs) of the CaO-SiO(2)-(P(2)O(5)) system. These mesoporous materials exhibit an ordered pore arrangement, and are promising candidates for improved bone and tooth implants. We discuss experimental MAS NMR results from three MBGs displaying different Ca, Si and P contents: the (29)Si NMR spectra were recorded either directly by employing radio-frequency pulses to (29)Si, or by magnetization transfers from neighbouring protons using cross polarization, thereby providing quantitative information about the silicate speciation present in the pore wall and at the MBG surface, respectively. The surface modifications were monitored for the three MBGs during their immersion in a simulated body fluid (SBF) for intervals between 30 min and one week. The results were formulated as a reaction sequence describing the interconversions between the distinct silicate species. We generally observed a depletion of Ca(2+) ions at the MBG surface, and a minor condensation of the silicate-surface network over one week of SBF soaking.

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Citations

Feb 22, 2012·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·A N Cormack, A Tilocca
Jan 15, 2014·Progress in Nuclear Magnetic Resonance Spectroscopy·Christian BonhommeDanielle Laurencin
Apr 30, 2016·Materials Science & Engineering. C, Materials for Biological Applications·J Carlos AlmeidaIsabel M Miranda Salvado
Oct 23, 2016·Dental Materials : Official Publication of the Academy of Dental Materials·T De CaluwéL C Martens
Mar 11, 2017·Journal of Biomedical Materials Research. Part a·Xianfeng ZhouNita Sahai
Mar 3, 2018·Materials·Sandra Sanchez-SalcedoMaria Vallet-Regi
Aug 11, 2017·Journal of Tissue Engineering·Md Towhidul IslamKazi M Zakir Hossain
Nov 5, 2019·Scientific Reports·Adriana ZeleňákováVladimír Zeleňák
Mar 15, 2018·Materials·María Vallet-Regi, Antonio J Salinas
Jul 16, 2019·Journal of Materials Science. Materials in Medicine·Breno Rocha BarrioniMarivalda de Magalhães Pereira
Mar 24, 2016·Materials·Marco AraújoEnrica Verné
Jan 27, 2021·ACS Biomaterials Science & Engineering·Soraia Alexandra Ramos CoelhoMaria Helena Vaz Fernandes
Jul 1, 2017·The Journal of Physical Chemistry. C, Nanomaterials and Interfaces·Renny MathewMattias Edén

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Methods Mentioned

BETA
nuclear magnetic resonance
NMR
X-ray
nuclear
transmission

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