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Byra N, Krukowski S, Sadlo J, Kolodziejski W. Composites Containing Nanohydroxyapatites and a Stable TEMPO Radical: Preparation and Characterization Using Spectrophotometry, EPR and 1H MAS NMR. MATERIALS 2022; 15:ma15062043. [PMID: 35329493 PMCID: PMC8952365 DOI: 10.3390/ma15062043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Revised: 03/05/2022] [Accepted: 03/08/2022] [Indexed: 02/01/2023]
Abstract
Hydroxyapatite is the main constituent of mammalian hard tissues. Basic applications of synthetic hydroxyapatites include bone and dental implantology and drug delivery systems. The study of hydroxyapatite surface properties could give greater insight into the processes of bone mineralization and degradation. Nitroxide radicals are stable radicals that exhibit anticancer and antioxidative properties and are often used as spin probes to study the dynamics of complex biological systems. In this work, we attempted to adsorb the stable 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO) on two hydroxyapatites (HAs) differing in specific surface area and the degree of hydration. The adsorption was carried out from cyclohexane, 1-chlorobutane and water. The solutions after adsorption were studied spectrophotometrically, while the obtained composites were characterized via NMR and EPR spectroscopy. The results show that it is possible to reproducibly obtain fairly stable composites, where the main factors influencing the adsorbed amount of the radical are solvent polarity and specific surface area of hydroxyapatite. The Langmuir isotherm was determined to be the most suitable adsorption model. The analysis of EPR and NMR spectra allowed us to determine the distribution of the TEMPO molecules on the hydroxyapatite surface, as well as a probable adsorption mechanism. The HA/TEMPO composites could potentially be used to study certain properties of hydroxyapatite surfaces with EPR spectroscopy. They could also be used as fillers after hard tissue surgery, as well as metal-free MRI contrasts.
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Affiliation(s)
- Natalia Byra
- Department of Analytical Chemistry, Medical University of Warsaw, Banacha 1, 02-097 Warsaw, Poland; (S.K.); (W.K.)
- Correspondence:
| | - Sylwester Krukowski
- Department of Analytical Chemistry, Medical University of Warsaw, Banacha 1, 02-097 Warsaw, Poland; (S.K.); (W.K.)
| | - Jaroslaw Sadlo
- Institute of Nuclear Chemistry and Technology, Dorodna 16, 03-195 Warsaw, Poland;
| | - Waclaw Kolodziejski
- Department of Analytical Chemistry, Medical University of Warsaw, Banacha 1, 02-097 Warsaw, Poland; (S.K.); (W.K.)
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Zhang Y, Wang M, Gao X, Qian J, Pan B. Structural Evolution of Lanthanum Hydroxides during Long-Term Phosphate Mitigation: Effect of Nanoconfinement. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:665-676. [PMID: 33347310 DOI: 10.1021/acs.est.0c05577] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Lanthanum (La)-based materials are effective in removing phosphate (P) from water to prevent eutrophication. Compared to their bulky analogues, La(OH)3 nanoparticles exhibit a higher P removal efficiency and a more stable P removal ability when spatially confined inside the host. Consequently, the understanding of the nanoconfinement effects on the long-term evolution of La-P structures is crucial for their practical use in P sequestration and recycle, which, however, is still missing. Here, we describe an attempt to explore the evolution of La-P structures, the P environment, and the status of La(OH)3 nanoparticles confined in the nanopores of the D201 resin, compared to a nonconfined analogue, over a P adsorption period of 25 days in both simulated wastewater and the real bioeffluent. A combinative use of X-ray diffraction (XRD), cross-polarization nuclear magnetic resonance (CP-NMR), and X-ray photoelectron spectroscopy (XPS) techniques confirms the transition from La-P inner-sphere complexation to the formation of LaPO4·xH2O and finally to LaPO4 in both samples. Interestingly, the rate of structural transformation in the real bioeffluent is substantially reduced. Nevertheless, in both conditions, nanoconfinement results in a much faster rate and larger extent of the structural transition. Moreover, nanoconfinement also facilitates the reverse transformation of stable LaPO4 back to La(OH)3. Our work provides the scientific basis of nanoconfinement for the preferable use of La-based nanocomposites in P mitigation, immobilization, and recycle application.
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Affiliation(s)
- Yanyang Zhang
- Research Center for Environmental Nanotechnology (ReCENT), State Key Laboratory of Pollution Control and Resources Reuse, School of Environment, Nanjing University, Nanjing 210023, China
| | - Minglu Wang
- Research Center for Environmental Nanotechnology (ReCENT), State Key Laboratory of Pollution Control and Resources Reuse, School of Environment, Nanjing University, Nanjing 210023, China
| | - Xiang Gao
- Research Center for Environmental Nanotechnology (ReCENT), State Key Laboratory of Pollution Control and Resources Reuse, School of Environment, Nanjing University, Nanjing 210023, China
| | - Jieshu Qian
- Research Center for Environmental Nanotechnology (ReCENT), State Key Laboratory of Pollution Control and Resources Reuse, School of Environment, Nanjing University, Nanjing 210023, China
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Xiao Ling Wei 200, Nanjing 210094, China
| | - Bingcai Pan
- Research Center for Environmental Nanotechnology (ReCENT), State Key Laboratory of Pollution Control and Resources Reuse, School of Environment, Nanjing University, Nanjing 210023, China
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Forse AC, Griffin JM, Grey CP. Selective observation of charge storing ions in supercapacitor electrode materials. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2018; 89:45-49. [PMID: 29157868 DOI: 10.1016/j.ssnmr.2017.10.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2017] [Accepted: 10/20/2017] [Indexed: 06/07/2023]
Abstract
Nuclear magnetic resonance (NMR) spectroscopy has emerged as a useful technique for probing the structure and dynamics of the electrode-electrolyte interface in supercapacitors, as ions inside the pores of the carbon electrodes can be studied separately from bulk electrolyte. However, in some cases spectral resolution can limit the information that can be obtained. In this study we address this issue by showing how cross polarisation (CP) NMR experiments can be used to selectively observe the in-pore ions in supercapacitor electrode materials. We do this by transferring magnetisation from 13C nuclei in porous carbons to nearby nuclei in the cations (1H) or anions (19F) of an ionic liquid. Two-dimensional NMR experiments and CP kinetics measurements confirm that in-pore ions are located within Ångströms of sp2-hybridised carbon surfaces. Multinuclear NMR experiments hold promise for future NMR studies of supercapacitor systems where spectral resolution is limited.
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Affiliation(s)
- Alexander C Forse
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK; Department of Chemistry, Department of Chemical and Biomolecular Engineering, and Berkeley Energy and Climate Institute, University of California, Berkeley, CA 94720, USA
| | - John M Griffin
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK; Department of Chemistry and Materials Science Institute, Lancaster University, Lancaster LA1 4YB, UK
| | - Clare P Grey
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK.
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Amorphous surface layer versus transient amorphous precursor phase in bone - A case study investigated by solid-state NMR spectroscopy. Acta Biomater 2017; 59:351-360. [PMID: 28690009 DOI: 10.1016/j.actbio.2017.06.040] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2017] [Revised: 06/23/2017] [Accepted: 06/26/2017] [Indexed: 12/31/2022]
Abstract
The presence of an amorphous surface layer that coats a crystalline core has been proposed for many biominerals, including bone mineral. In parallel, transient amorphous precursor phases have been proposed in various biomineralization processes, including bone biomineralization. Here we propose a methodology to investigate the origin of these amorphous environments taking the bone tissue as a key example. This study relies on the investigation of a bone tissue sample and its comparison with synthetic calcium phosphate samples, including a stoichiometric apatite, an amorphous calcium phosphate sample, and two different biomimetic apatites. To reveal if the amorphous environments in bone originate from an amorphous surface layer or a transient amorphous precursor phase, a combined solid-state nuclear magnetic resonance (NMR) experiment has been used. The latter consists of a double cross polarization 1H→31P→1H pulse sequence followed by a 1H magnetization exchange pulse sequence. The presence of an amorphous surface layer has been investigated through the study of the biomimetic apatites; while the presence of a transient amorphous precursor phase in the form of amorphous calcium phosphate particles has been mimicked with the help of a physical mixture of stoichiometric apatite and amorphous calcium phosphate. The NMR results show that the amorphous and the crystalline environments detected in our bone tissue sample belong to the same particle. The presence of an amorphous surface layer that coats the apatitic core of bone apatite particles has been unambiguously confirmed, and it is certain that this amorphous surface layer has strong implication on bone tissue biogenesis and regeneration. STATEMENT OF SIGNIFICANCE Questions still persist on the structural organization of bone and biomimetic apatites. The existing model proposes a core/shell structure, with an amorphous surface layer coating a crystalline bulk. The accuracy of this model is still debated because amorphous calcium phosphate (ACP) environments could also arise from a transient amorphous precursor phase of apatite. Here, we provide an NMR spectroscopy methodology to reveal the origin of these ACP environments in bone mineral or in biomimetic apatite. The 1H magnetization exchange between protons arising from amorphous and crystalline domains shows unambiguously that an ACP layer coats the apatitic crystalline core of bone et biomimetic apatite platelets.
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Frasnelli M, Cristofaro F, Sglavo VM, Dirè S, Callone E, Ceccato R, Bruni G, Cornaglia AI, Visai L. Synthesis and characterization of strontium-substituted hydroxyapatite nanoparticles for bone regeneration. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2016; 71:653-662. [PMID: 27987756 DOI: 10.1016/j.msec.2016.10.047] [Citation(s) in RCA: 75] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2016] [Revised: 10/05/2016] [Accepted: 10/23/2016] [Indexed: 01/22/2023]
Abstract
The production of stable suspensions of strontium-substituted hydroxyapatite (Sr-HA) nanopowders, as Sr ions vector for bone tissue regeneration, was carried out in the present work. Sr-HA nanopowders were synthesized via aqueous precipitation methods using Sr2+ amount from 0 to 100mol% and were characterized by several complementary techniques such as solid-state Nuclear Magnetic Resonance spectroscopy, X-ray diffraction, Infrared spectroscopy, N2 physisorption and Transmission Electron Microscopy. The substitution of Ca2+ with Sr2+ in HA is always isomorphic with gradual evolution between the two limit compositions (containing 100% Ca and 100% Sr), this pointing out the homogeneity of the synthesized nanopowders and the complete solubility of strontium in HA lattice. Strontium addition is responsible for an increasing c/a ratio in the triclinic unit cell. A significant variation of the nanopowders shape and dimension is also observed, a preferential growth along the c-axis direction being evident at higher strontium loads. Modifications in the local chemical environment of phosphate and hydroxyl groups in the apatite lattice are also observed. Stable suspensions were produced by dispersing the synthesized nanopowders in bovine serum albumin. Characterization by Dynamic Light Scattering and ζ-potential determination allowed to show that Ca2+→Sr2+ substitution influences the hydrodynamic diameter, which is always twice the particles size determined by TEM, the nanoparticles being always negatively charged as a result from the albumin rearrangement upon the interaction with nanoparticles surface. The biocompatibility of the suspensions was studied in terms of cell viability, apoptosis, proliferation and morphology, using osteosarcoma cell line SAOS-2. The data pointed out an increased cell proliferation for HA nanoparticles containing larger Sr2+ load, the cells morphology remaining essentially unaffected.
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Affiliation(s)
- Matteo Frasnelli
- Department of Industrial Engineering, University of Trento, Via Sommarive 9, 38123 Trento, Italy; INSTM Research Unit, Via G. Giusti 9, 50123 Firenze, Italy.
| | - Francesco Cristofaro
- Department of Molecular Medicine, Center for Health Technologies (CHT), University of Pavia, Viale Taramelli 3/b, 27100 Pavia, Italy
| | - Vincenzo M Sglavo
- Department of Industrial Engineering, University of Trento, Via Sommarive 9, 38123 Trento, Italy; INSTM Research Unit, Via G. Giusti 9, 50123 Firenze, Italy
| | - Sandra Dirè
- Department of Industrial Engineering, University of Trento, Via Sommarive 9, 38123 Trento, Italy; "Klaus Müller" NMR Laboratory, Department of Industrial Engineering, University of Trento, Via Sommarive 9, 38123 Trento, Italy
| | - Emanuela Callone
- Department of Industrial Engineering, University of Trento, Via Sommarive 9, 38123 Trento, Italy; "Klaus Müller" NMR Laboratory, Department of Industrial Engineering, University of Trento, Via Sommarive 9, 38123 Trento, Italy
| | - Riccardo Ceccato
- Department of Industrial Engineering, University of Trento, Via Sommarive 9, 38123 Trento, Italy
| | - Giovanna Bruni
- Department of Chemistry, Physical-Chemistry Section, University of Pavia, Viale Taramelli 16, 27100 Pavia (PV), Italy
| | | | - Livia Visai
- Department of Molecular Medicine, Center for Health Technologies (CHT), University of Pavia, Viale Taramelli 3/b, 27100 Pavia, Italy; Department of Occupational Medicine, Toxicology and Environmental Risks, S. Maugeri Foundation, IRCCS, Via S. Boezio, 28, 27100 Pavia (PV), Italy
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Kareiva S, Klimavicius V, Momot A, Kausteklis J, Prichodko A, Dagys L, Ivanauskas F, Sakirzanovas S, Balevicius V, Kareiva A. Sol–gel synthesis, phase composition, morphological and structural characterization of Ca10(PO4)6(OH)2: XRD, FTIR, SEM, 3D SEM and solid-state NMR studies. J Mol Struct 2016. [DOI: 10.1016/j.molstruc.2016.04.046] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Rojas L, Olmedo H, García-Piñeres AJ, Silveira C, Tasic L, Fraga F, Montero ML. Simple route for nano-hydroxyapatite properties expansion. Biomed Mater 2015; 10:055015. [DOI: 10.1088/1748-6041/10/5/055015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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Kolmas J, Marek D, Kolodziejski W. Near-Infrared (NIR) Spectroscopy of Synthetic Hydroxyapatites and Human Dental Tissues. APPLIED SPECTROSCOPY 2015; 69:902-912. [PMID: 26163232 DOI: 10.1366/14-07720] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Near-infrared spectroscopy (NIR) was used to analyze synthetic hydroxyapatite calcined at various temperatures, synthetic carbonated hydroxyapatite, and human hard dental tissues (enamel and dentin). The NIR bands of those materials in the combination, first-overtone, and second-overtone spectral regions were assigned and evaluated for structural characterization. They were attributed to adsorbed and structural water, structural hydroxyl (OH) groups and surface P-OH groups. The NIR spectral features were quantitatively discussed in view of proton solid-state magic-angle spinning nuclear magnetic resonance ((1)H MAS NMR) results. We conclude that the NIR spectra of apatites are useful in the structural characterization of synthetic and biogenic apatites.
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Affiliation(s)
- Joanna Kolmas
- Medical University of Warsaw, Faculty of Pharmacy, Department of Inorganic and Analytical Chemistry, ul. Banacha 1, 02-097 Warsaw, Poland
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Taylor AJ, Rendina E, Smith BJ, Zhou DH. Analyses of mineral specific surface area and hydroxyl substitution for intact bone. Chem Phys Lett 2013; 588. [PMID: 24347673 DOI: 10.1016/j.cplett.2013.09.061] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Bone minerals possess two primary hydrogen sources: hydroxide ions in the nanocrystalline core and structural water in the amorphous surface layer. In order to accurately measure their concentrations using hydrogen to phosphorus cross polarization NMR spectroscopy, it is necessary to analyze the dependence of signal intensities on serial contact times, namely, cross polarization kinetics. A reliable protocol is developed to iteratively decompose the severely overlapped spectra and to analyze the cross-polarization kinetics, leading to measurement of hydroxyl and structural water concentrations. Structural water concentration is used to estimate mineral specific surface area and nanocrystal thickness for intact bone.
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Affiliation(s)
- Amanda J Taylor
- Department of Physics, Oklahoma State University, Stillwater, OK, USA 74078
| | - Elizabeth Rendina
- Department of Nutritional Sciences, Oklahoma State University, Stillwater, OK, USA 74078
| | - Brenda J Smith
- Department of Nutritional Sciences, Oklahoma State University, Stillwater, OK, USA 74078
| | - Donghua H Zhou
- Department of Physics, Oklahoma State University, Stillwater, OK, USA 74078
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Forse AC, Griffin JM, Wang H, Trease NM, Presser V, Gogotsi Y, Simon P, Grey CP. Nuclear magnetic resonance study of ion adsorption on microporous carbide-derived carbon. Phys Chem Chem Phys 2013; 15:7722-30. [DOI: 10.1039/c3cp51210j] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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