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Kowalska K, Skwarek E, Demianenko E, Paientko V. Composites with Immobilized Bioactive Spirulina on an Inorganic Substrate (Yellow Clay, Hydroxyapatite, SiO 2, TiO 2, ZnO). Chemphyschem 2024; 25:e202400251. [PMID: 38679578 DOI: 10.1002/cphc.202400251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2024] [Revised: 04/22/2024] [Accepted: 04/23/2024] [Indexed: 05/01/2024]
Abstract
In order to improve the structural properties of clays and composites of powdered spirulina, clay, nanosilica, hydroxyapatite, TiO2 and ZnO were used as an additive for mechanical processing. As a result, composites with natural nanostructured materials (NNM) are prepared with improved structural properties and bioactivity. The mixtures based on NNM with crystalline kaolinite, clays and admixtures were processed in a knife mill. The materials were characterized using FTIR spectroscopy, nitrogen adsorption and desorption, SEM release of bioactive components (anthocyanin 0,004-0,07 mg/g; chlorophyll 20-29 mg/g), composite toxicity level (below 25%), particle size measurement and surface charge density, zeta potential. Adsorption enthalpies during the formation of an intermolecular complex during the interactions of an anthocyanin molecule with the appropriate component of the composite were also calculated. There are regularities in the characteristics depending on the type of NNM, particle morphology and textural features of solids. The morphological and structural properties of the components changed slighty in the blends because the processing was conducted under relatively low mechanical stress. The morphological, textural and structural characteristics of the composites as well as the transformation to a nanostructured state, assume great bioactive activity of the composites, interesting for practical applications in medicine and cosmetics.
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Affiliation(s)
- Klaudia Kowalska
- Department of Radiochemistry and Environmental Chemistry, Institute of Chemical Sciences, Faculty of Chemistry, Maria Curie-Skłodowska University, 3 Maria Curie-Skłodowska Sq., 20-031, Lublin, Poland
| | - Ewa Skwarek
- Department of Radiochemistry and Environmental Chemistry, Institute of Chemical Sciences, Faculty of Chemistry, Maria Curie-Skłodowska University, 3 Maria Curie-Skłodowska Sq., 20-031, Lublin, Poland
| | - Evgeny Demianenko
- Chuiko Institute of Surface Chemistry, 17 General Naumov Street, 03164, Kyiv, Ukraine
| | - Victoria Paientko
- Department of Radiochemistry and Environmental Chemistry, Institute of Chemical Sciences, Faculty of Chemistry, Maria Curie-Skłodowska University, 3 Maria Curie-Skłodowska Sq., 20-031, Lublin, Poland
- Chuiko Institute of Surface Chemistry, 17 General Naumov Street, 03164, Kyiv, Ukraine
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Yin X, Xia W, Fan H, Yang X, Xiang K, Ren Y, Zhu Z. Nanoclay Reinforced Integrated Scaffold for Dual-Lineage Regeneration of Cartilage and Subchondral Bone. ACS APPLIED MATERIALS & INTERFACES 2024; 16:37683-37697. [PMID: 38980692 DOI: 10.1021/acsami.4c07092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/10/2024]
Abstract
Tissue engineering is theoretically considered a promising approach for repairing osteochondral defects. Nevertheless, the insufficient osseous support and integration of the cartilage layer and the subchondral bone frequently lead to the failure of osteochondral repair. Drawing from this, it was proposed that incorporating glycine-modified attapulgite (GATP) into poly(1,8-octanediol-co-citrate) (POC) scaffolds via the one-step chemical cross-linking is proposed to enhance cartilage and subchondral bone defect repair simultaneously. The effects of the GATP incorporation ratio on the physicochemical properties, chondrocyte and MC3T3-E1 behavior, and osteochondral defect repair of the POC scaffold were also evaluated. In vitro studies indicated that the POC/10% GATP scaffold improved cell proliferation and adhesion, maintained cell phenotype, and upregulated chondrogenesis and osteogenesis gene expression. Animal studies suggested that the POC/10% GATP scaffold has significant repair effects on both cartilage and subchondral bone defects. Therefore, the GATP-incorporated scaffold system with dual-lineage bioactivity showed potential application in osteochondral regeneration.
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Affiliation(s)
- Xueling Yin
- Institute of Nano-science and Nano-technology, College of Physical Science and Technology, Central China Normal University, Wuhan, Hubei 430079, China
| | - Wanting Xia
- Institute of Nano-science and Nano-technology, College of Physical Science and Technology, Central China Normal University, Wuhan, Hubei 430079, China
| | - Huimin Fan
- Institute of Nano-science and Nano-technology, College of Physical Science and Technology, Central China Normal University, Wuhan, Hubei 430079, China
| | - Xiaoyu Yang
- Institute of Nano-science and Nano-technology, College of Physical Science and Technology, Central China Normal University, Wuhan, Hubei 430079, China
| | - Kaiwen Xiang
- Hospital of Central China Normal University, Wuhan, Hubei 430079, China
| | - Ye Ren
- Department of Orthopedics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430030, China
| | - Zhihong Zhu
- Institute of Nano-science and Nano-technology, College of Physical Science and Technology, Central China Normal University, Wuhan, Hubei 430079, China
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MODIFICATION OF MONTMORILLONITE FOR OBTAINING NANOCOMPOSITES BASED ON POLAR POLYMERS. Polym J 2022. [DOI: 10.15407/polymerj.44.04.245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
This review covers almost all known categories of compounds used to modify montmorillonite to obtain nanocomposites based on polar polymers. Organic modifiers such as quaternary ammonium ions, quaternary phosphonium ions, amino acids and other organic compounds are commonly used to modify montmorillonite (MMT). The main directions of scientific research in this field are considered, namely the modification of MMT with ammonium surfactants, phosphonium surfactants, amino acids and nonionic surfactants. The review used 67 sources related to peer-reviewed publications, mostly from the last 10-15 years. The largest number of publications devoted to the modification of MMT was published in the period from 2004 to 2016. Nanocomposites based on epoxy resins are especially widely presented in the literature. Epoxy-based materials have been used for many years as convenient matrices for dispersing MMT due to the advantages of properties of the obtained polymer nanocomposites, such as mechanical strength, non-flammability and thermal stability. The methods of surface modification of MMT with organic modifiers considered in the article are a powerful tool for the production of polymer nanocomposite materials based on polar polymers. Amine modification of MMT allowed the formation of highly effective materials, in particular epoxy/MMT materials. These nanocomposites have demonstrated extraordinary material properties compared to virgin polymers and can therefore be used as an alternative to conventional materials such as steel and wood, reducing the cost and weight of products. Nanocomposites based on polar polymers occupy an important place among all polymer nanocomposites as modern materials used in the aerospace, automotive and electrical industries.
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Katti KS, Jasuja H, Jaswandkar SV, Mohanty S, Katti DR. Nanoclays in medicine: a new frontier of an ancient medical practice. MATERIALS ADVANCES 2022; 3:7484-7500. [PMID: 36324871 PMCID: PMC9577303 DOI: 10.1039/d2ma00528j] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Accepted: 08/23/2022] [Indexed: 06/16/2023]
Abstract
Clays have been used as early as 2500 BC in human civilization for medicinal purposes. The ease of availability, biocompatibility, and versatility of these unique charged 2D structures abundantly available in nature have enabled the extensive applications of clays in human history. Recent advances in the use of clays in nanostructures and as components of polymer clay nanocomposites have exponentially expanded the use of clays in medicine. This review covers the details of structures and biomedical applications of several common clays, including montmorillonite, LAPONITE®, kaolinite, and halloysite. Here we describe the applications of these clays in wound dressings as hemostatic agents in drug delivery of drugs for cancer and other diseases and tissue engineering. Also reviewed are recent experimental and modeling studies that elucidate the impact of clay structures on cellular processes and cell adhesion processes. Various mechanisms of clay-mediated bioactivity, including protein localization, modulation of cell adhesion, biomineralization, and the potential of clay nanoparticles to impact cell differentiation, are presented. We also review the current developments in understanding the impact of clays on cellular responses. This review also elucidates new emerging areas of use of nanoclays in osteogenesis and the development of in vitro models of bone metastasis of cancer.
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Affiliation(s)
- Kalpana S Katti
- Department of Civil Construction and Environmental Engineering, North Dakota State University Fargo ND 58105 USA 701-231-9504
| | - Haneesh Jasuja
- Department of Civil Construction and Environmental Engineering, North Dakota State University Fargo ND 58105 USA 701-231-9504
| | - Sharad V Jaswandkar
- Department of Civil Construction and Environmental Engineering, North Dakota State University Fargo ND 58105 USA 701-231-9504
| | - Sibanwita Mohanty
- Department of Civil Construction and Environmental Engineering, North Dakota State University Fargo ND 58105 USA 701-231-9504
| | - Dinesh R Katti
- Department of Civil Construction and Environmental Engineering, North Dakota State University Fargo ND 58105 USA 701-231-9504
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Goloshchapov D, Kashkarov V, Nikitkov K, Seredin P. Investigation of the Effect of Nanocrystalline Calcium Carbonate-Substituted Hydroxyapatite and L-Lysine and L-Arginine Surface Interactions on the Molecular Properties of Dental Biomimetic Composites. Biomimetics (Basel) 2021; 6:70. [PMID: 34940013 PMCID: PMC8698581 DOI: 10.3390/biomimetics6040070] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2021] [Revised: 12/06/2021] [Accepted: 12/09/2021] [Indexed: 01/06/2023] Open
Abstract
Differences in the surface interactions of non-stoichiometric nanocrystalline B-type carbonate-substituted hydroxyapatite (n-cHAp) with the amino acids L-Lysine hydrochloride (L-LysHCl) and L-Arginine hydrochloride (L-ArgHCl) in acidic and alkaline media were determined using structural and spectroscopic analysis methods. The obtained data confirm that hydroxyapatite synthesized using our technique, which was used to develop the n-cHAp/L-LysHCl and n-cHAp/L-ArgHCl composites, is nanocrystalline. Studies of molecular composition of the samples by Fourier transform infrared spectroscopy under the change in the charge state of L-Lysine in environments with different alkalinity are consistent with the results of X-ray diffraction analysis, as evidenced by the redistribution of the modes' intensities in the spectra that is correlated with the side chains, i.e., amide and carboxyl groups, of the amino acid. During the formation of a biomimetic composite containing L-Lysine hydrochloride and n-cHAp, the interaction occurred through bonding of the L-Lysine side chain and the hydroxyl groups of hydroxyapatite, which created an anionic form of L-Lysine at pH ≤ 5. In contrast, in biocomposites based on L-Arginine and n-cHAp, the interaction only slightly depends on pH value, and it proceeds by molecular orientation mechanisms. The X-ray diffraction and infrared spectroscopy results confirm that changes in the molecular composition of n-cHAp/L-ArgHCl biomimetic composites are caused by the electrostatic interaction between the L-ArgHCl molecule and the carbonate-substituted calcium hydroxyapatite. In this case, the bond formation was detected by Fourier transform infrared (FTIR) spectroscopy; the vibrational modes attributed to the main carbon chain and the guanidine group of L-Arginine are shifted during the interaction. The discovered interaction mechanisms between nanocrystalline carbonate-substituted hydroxyapatite that has physicochemical properties characteristic of the apatite in human dental enamel and specific amino acids are important for selecting the formation conditions of biomimetic composites and their integration with the natural dental tissue.
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Affiliation(s)
- Dmitry Goloshchapov
- Solid State Physics and Nanostructures Department, Voronezh State University, University Sq. 1, 394018 Voronezh, Russia; (D.G.); (V.K.); (K.N.)
| | - Vladimir Kashkarov
- Solid State Physics and Nanostructures Department, Voronezh State University, University Sq. 1, 394018 Voronezh, Russia; (D.G.); (V.K.); (K.N.)
| | - Kirill Nikitkov
- Solid State Physics and Nanostructures Department, Voronezh State University, University Sq. 1, 394018 Voronezh, Russia; (D.G.); (V.K.); (K.N.)
| | - Pavel Seredin
- Solid State Physics and Nanostructures Department, Voronezh State University, University Sq. 1, 394018 Voronezh, Russia; (D.G.); (V.K.); (K.N.)
- Scientific and Educational Center “Nanomaterials and Nanotechnologies”, Ural Federal, Mir Av., 620002 Yekaterinburg, Russia
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Molla MDS, Katti DR, Iswara J, Venkatesan R, Paulmurugan R, Katti KS. Prostate Cancer Phenotype Influences Bone Mineralization at Metastasis: A Study Using an In Vitro Prostate Cancer Metastasis Testbed. JBMR Plus 2020; 4:e10256. [PMID: 32083238 PMCID: PMC7017885 DOI: 10.1002/jbm4.10256] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/19/2019] [Revised: 11/01/2019] [Accepted: 11/13/2019] [Indexed: 12/18/2022] Open
Abstract
In this study, two types of prostate cancer cell lines, highly metastatic PC-3 and low metastatic MDA PCa 2b (PCa) were cultured on bone mimetic scaffolds to recapitulate metastasis to bone. A unique in vitro 3D tumor model that uses a sequential culture (SC) of human mesenchymal stem cells followed by seeding with cancer cells after bone formation was initiated to study the phenotype-specific interaction between prostate cancer cells and bone microenvironment. The PCa cells were observed to be less prolific and less metastatic, and to form multicellular tumoroids in the bone microenvironment, whereas PC-3 cells were more prolific and were highly metastatic, and did not form multicellular tumoroids in the bone microenvironment. The metastatic process exhibited by these two prostate cancer cell lines showed a significant and different effect on bone mineralization and extracellular matrix formation. Excessive bone formation in the presence of PC-3 and significant osteolysis in the presence of PCa were observed, which was also indicated by osteocalcin and MMP-9 expression as measured by ELISA and qRT-PCR. The field emission scanning electron microscopy images revealed that the structure of mineralized collagen in the presence of PC-3 is different than the one observed in healthy bone. All experimental results indicated that both osteolytic and osteoblastic bone lesions can be recapitulated in our tumor testbed model and that different cancer phenotypes have a very different influence on bone at metastasis. The 3D in vitro model presented in this study provides an improved, reproducible, and controllable system that is a useful tool to elucidate osteotropism of prostate cancer cells. © 2019 The Authors. JBMR Plus published by Wiley Periodicals, Inc. on behalf of American Society for Bone and Mineral Research.
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Affiliation(s)
- MD Shahjahan Molla
- Center for Engineered Cancer TestbedsNorth Dakota State UniversityFargoNDUSA
- Department of Civil and Environmental EngineeringNorth Dakota State UniversityFargoNDUSA
- Scintillon InstituteSan DiegoUSA
| | - Dinesh R Katti
- Center for Engineered Cancer TestbedsNorth Dakota State UniversityFargoNDUSA
- Department of Civil and Environmental EngineeringNorth Dakota State UniversityFargoNDUSA
| | - Jairam Iswara
- Department of Urology, Saint Elizabeth's Medical CenterTufts UniversityBostonMAUSA
| | - Renugopalkrishnan Venkatesan
- Department of Chemistry and Chemical BiologyNortheastern UniversityBostonMAUSA
- Center for Life SciencesBoston Children's Hospital, Harvard Medical School, BostonMassachusettsUSA
| | - Ramasamy Paulmurugan
- Department of RadiologyCellular Pathway Imaging Laboratory (CPIL), Stanford University School of MedicinePalo AltoCAUSA
| | - Kalpana S Katti
- Center for Engineered Cancer TestbedsNorth Dakota State UniversityFargoNDUSA
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7
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Mechanics of amelogenin TRAP protein in the proximity of hydroxyapatite mineral is altered by interfacial water. Chem Phys 2019. [DOI: 10.1016/j.chemphys.2019.02.017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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8
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Li S, Chen C, Zhang Z, Wang D, Lv S. Illustration and application of enhancing effect of arginine on interactions between nano-clays: self-healing hydrogels. SOFT MATTER 2019; 15:303-311. [PMID: 30556077 DOI: 10.1039/c8sm02188k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Nano-clays (NCs) as a representative type of nano-materials are a source of inspiration for design of new biomedical materials with excellent performances. Research has shown that guanidinium ions (Gu+) can form non-covalent salt-bridge interactions with NCs, serving as "molecular glue" in the fabrication of NC-based composites. However, synthesis of the Gu+-containing molecules is always not easy. Since the natural amino acid arginine (Arg) possesses Gu+, Arg could potentially be a replacement for the synthetic molecules. To prove this possibility, nano-composites were constructed by combining model anisotropic NCs with Arg-modified nano-hydroxyapatite (nHAP-Arg) and polyarginine (poly-Arg), respectively. Formation of molecular interactions between NCs and nHAP-Arg/poly-Arg was demonstrated by enhanced gelation behaviour of NCs. Through taking the unique advantage of Arg, this study can be readily implemented in constructing a variety of NC-based composites with diverse functionalities that are necessary for potential applications in tissue engineering and regenerative medicine.
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Affiliation(s)
- Shouchuan Li
- State Key Laboratory of Organic-Inorganic Composite Materials, Beijing University of Chemical Technology, 15 Beisanhuan East Road, Chaoyang District, Beijing, 100029, China.
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Sharma A, Molla MDS, Katti KS, Katti DR. Multiscale Models of Degradation and Healing of Bone Tissue Engineering Nanocomposite Scaffolds. JOURNAL OF NANOMECHANICS AND MICROMECHANICS 2017. [DOI: 10.1061/(asce)nm.2153-5477.0000133] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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10
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Dussan A, Bertel SD, Melo SF, Mesa F. Synthesis and characterization of porous silicon as hydroxyapatite host matrix of biomedical applications. PLoS One 2017; 12:e0173118. [PMID: 28291792 PMCID: PMC5349455 DOI: 10.1371/journal.pone.0173118] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2016] [Accepted: 02/15/2017] [Indexed: 01/24/2023] Open
Abstract
In this work, porous-silicon samples were prepared by electrochemical etching on p-type (B-doped) Silicon (Si) wafers. Hydrofluoric acid (HF)-ethanol (C2H5OH) [HF:Et] and Hydrofluoric acid (HF)-dimethylformamide (DMF-C3H7NO) [HF:DMF] solution concentrations were varied between [1:2]-[1:3] and [1:7]-[1:9], respectively. Effects of synthesis parameters, like current density, solution concentrations, reaction time, on morphological properties were studied by scanning electron microscopy (SEM) and atomic force microscopy (AFM) measurements. Pore sizes varying from 20 nm to micrometers were obtained for long reaction times and [HF:Et] [1:2] concentrations; while pore sizes in the same order were observed for [HF:DMF] [1:7], but for shorter reaction time. Greater surface uniformity and pore distribution was obtained for a current density of around 8 mA/cm2 using solutions with DMF. A correlation between reflectance measurements and pore size is presented. The porous-silicon samples were used as substrate for hydroxyapatite growth by sol-gel method. X-ray diffraction (XRD) and SEM were used to characterize the layers grown. It was found that the layer topography obtained on PS samples was characterized by the evidence of Hydroxyapatite in the inter-pore regions and over the surface.
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Affiliation(s)
- A Dussan
- Universidad Nacional de Colombia, Facultad de Ciencias, Departamento de Física, Grupo de Materiales Nanoestructutrados y sus Aplicaciones, Ciudad Universitaria, Bogotá, Colombia
| | - S D Bertel
- Universidad Nacional de Colombia, Facultad de Ciencias, Departamento de Física, Grupo de Materiales Nanoestructutrados y sus Aplicaciones, Ciudad Universitaria, Bogotá, Colombia
| | - S F Melo
- Universidad Nacional de Colombia, Facultad de Ciencias, Departamento de Física, Grupo de Materiales Nanoestructutrados y sus Aplicaciones, Ciudad Universitaria, Bogotá, Colombia
| | - F Mesa
- Universidad del Rosario, Facultad de Ciencias Naturales y Matemáticas, Grupo NanoTech, Bogotá, Colombia
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Alves MM, Prosek T, Santos CF, Montemor MF. In vitro degradation of ZnO flowered coated Zn-Mg alloys in simulated physiological conditions. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017; 70:112-120. [DOI: 10.1016/j.msec.2016.08.071] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2016] [Revised: 08/22/2016] [Accepted: 08/26/2016] [Indexed: 10/21/2022]
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Alves MM, Prošek T, Santos CF, Montemor MF. Evolution of the in vitro degradation of Zn–Mg alloys under simulated physiological conditions. RSC Adv 2017. [DOI: 10.1039/c6ra28542b] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Primary reactions occurring upon Zn-derived materials insertion inside an organism are of utmost importance as chemical species resulting from the degradation of resorbable biomaterials are crucial for the interaction with the surrounding tissues.
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Affiliation(s)
- Marta M. Alves
- CQE
- DEQ
- Instituto Superior Técnico
- Universidade de Lisboa
- Lisboa
| | - Tomáš Prošek
- Technopark Kralupy
- The University of Chemistry and Technology in Prague
- 278 01 Kralupy nad Vltavou
- Czech Republic
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Othmani M, Aissa A, Grelard A, Das RK, Oda R, Debbabi M. Synthesis and characterization of hydroxyapatite-based nanocomposites by the functionalization of hydroxyapatite nanoparticles with phosphonic acids. Colloids Surf A Physicochem Eng Asp 2016. [DOI: 10.1016/j.colsurfa.2016.08.078] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Payne SA, Katti DR, Katti KS. Probing electronic structure of biomineralized hydroxyapatite inside nanoclay galleries. Micron 2016; 90:78-86. [PMID: 27619364 DOI: 10.1016/j.micron.2016.09.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2016] [Revised: 08/30/2016] [Accepted: 09/01/2016] [Indexed: 11/17/2022]
Abstract
Hydroxyapatite, the most abundant mineral in the human body, is also an important component in design of biomaterials for bone tissue regeneration. Synthetic hydroxyapatite mineralized in the laboratory often does not exhibit the same biological and morphological properties of biogenic hydroxyapatite in human bone. A biomimetic hydroxyapatite structure is synthesized using biomineralization routes inside the clay galleries of montmorillonite clay. Amino acids are used to modify the clay galleries. These amino acids are used to mineralize hydroxyapatite. The molecular interactions between nanoclay, modifiers inside nanoclay (amino acids) and biomineralized hydroxyapatite result in unique morphology, structure and stoichiometry of the biomineralized hydroxyapatite. Prior studies have indicated that this biomineralized hydroxyapatite inside nanoclay galleries is an effective component of tissue engineering bone scaffolds that elicits an optimal biological response from human mesenchymal stem cells. Here, a detailed electron energy-loss spectroscopy (EELS) study is reported that elucidates the differences in hydroxyapatite, biomineralized hydroxyapatite and β-tricalcium phosphate (β-TCP). Comparison of EELS low-loss transitions and energy loss near-edge structure (ELNES) of P-L2,3 edges for these three compounds is done to determine if there are differences in their electronic structures. These changes observed experimentally are compared with prior predictions and simulations using molecular dynamics studies. The simulations predict attractive and repulsive interactions between phosphate, modified MMT clay and aminovaleric acid (amino acid) molecules. Kramers-Kronig analysis is performed on the loss spectra obtained to yield the real and imaginary parts of the dielectric function of the apatites (ε1 and ε 2). We have also used the ε2 spectra obtained to calculate the AC conductivity spectra for the apatites. This study represents a unique experimental probe into molecular interactions in complex biomineralized hydroxyapatite structures. The small changes observed in the energy loss spectra appear to play important biological roles in biomineralized hydroxyapatite such as the ability to differentiate human mesenchymal stem cells into osteoblasts without growth media.
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Affiliation(s)
- Scott A Payne
- Department of Civil and Environmental Engineering, North Dakota State University, Fargo, ND 58105, USA
| | - Dinesh R Katti
- Department of Civil and Environmental Engineering, North Dakota State University, Fargo, ND 58105, USA
| | - Kalpana S Katti
- Department of Civil and Environmental Engineering, North Dakota State University, Fargo, ND 58105, USA.
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15
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Alves MM, Cunha DV, Santos CF, Mira NP, Montemor MF. In vitro corrosion behaviour and anti-Candida spp. activity of Zn coated with ZnO-nanostructured 'Anastacia' flowers. J Mater Chem B 2016; 4:4754-4761. [PMID: 32263249 DOI: 10.1039/c6tb00797j] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Rejection and colonization by microbes are two problematic issues that often require the surgical removal of medical implants with increased risks for patients. In this work it is shown that functionalization of Zn surfaces with ZnO-nanostructured 'Anastacia' flowers (NAF) resulted in improved biomaterials that can potentially overcome these important drawbacks, which can further boost the use of Zn in biomedical implants. The in vitro degradation of NAF-coated Zn under simulated physiological conditions resulted in the formation of a biomimetic corrosion layer rich in a hydroxyapatite analogue that, being an important bone component, may potentially decrease implant rejection. Colonization of the NAF-coated Zn surface by Candida parapsilosis and Candida albicans, two of the more relevant microbial species colonizing medical devices, was significantly reduced on the NAF-coated Zn surface. The mechanism by which this colonization inhibition occurred was distinct since for C. parapsilosis cells this was attributed to reduced cell viability, while for C. albicans the reduced colonization was related to impaired biofilm formation. This ZnO-derived coating is an expeditious strategy to improve the resilience of Zn-based resorbable biomaterials towards Candida spp. colonization, paving the way for the design of bioactive ZnO-derived coatings with potential for clinical applications on bone.
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Affiliation(s)
- Marta M Alves
- CQE Instituto Superior Técnico, Departamento de Engenharia Química, Universidade de Lisboa, Av. Rovisco Pais 1049-001, Lisboa, Portugal.
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16
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Water at hydroxyapatite surfaces: the effect of coverage and surface termination as investigated by all-electron B3LYP-D* simulations. Theor Chem Acc 2016. [DOI: 10.1007/s00214-016-1818-8] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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