1
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Ge X, Fan Y, Zhai H, Chi J, Putnis CV, Wang L, Zhang W. Direct observations of nanoscale brushite dissolution by the concentration-dependent adsorption of phosphate or phytate. WATER RESEARCH 2024; 248:120851. [PMID: 37976955 DOI: 10.1016/j.watres.2023.120851] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2023] [Revised: 11/05/2023] [Accepted: 11/08/2023] [Indexed: 11/19/2023]
Abstract
With the development of agricultural intensification, phosphorus (P) accumulation in croplands and sediments has resulted in the increasingly widespread interaction between inorganic and organic P species, which has been, previously, underestimated or even ignored. We quantified the nanoscale dissolution kinetics of sparingly soluble brushite (CaHPO4·2H2O, DCPD) over a broad range of phosphate and/or phytate concentrations by using in situ atomic force microscopy (AFM). Compared to water, we found that low concentrations of phosphate (1-1000 µM) or phytate (1-100 µM) inhibited brushite dissolution by slowing single step retraction. However, with increasing phosphate or phytate concentrations to 10 mM, there was a reverse effect of dissolution promotion at brushite-water interfaces. In situ observations of the coupled dissolution-reprecipitation showed that phosphate precipitated more readily than phytate on brushite surfaces, with the formation of amorphous calcium phosphate (ACP). For a fundamental understanding, zeta potential and in situ Raman spectroscopy (RS) revealed that the concentration-dependent dissolution is attributed to the reverse of outer-sphere to inner-sphere adsorption with increasing phosphate or phytate concentrations. In addition, the mineralization of phytate with outer-sphere adsorption by phytase was higher than that with inner-spere adsorption, and the presence of phytate delayed ACP phase transformation to hydroxylapatite (HAP). These in situ observations and analyses may fill the knowledge gaps of interaction between inorganic and organic P species in P-rich terrestrial and aquatic environments, thereby implicating their biogeochemical cycling and the associated availability.
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Affiliation(s)
- Xinfei Ge
- College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China; Department of Environmental Science, Zhejiang University, Hangzhou 310058, China; Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou 310058, China
| | - Yuke Fan
- College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
| | - Hang Zhai
- Department of Civil and Environmental Engineering, University of Wisconsin-Madison, Madison, WI 53706, United States
| | - Jialin Chi
- College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
| | - Christine V Putnis
- Institut für Mineralogie, University of Münster, Münster 48149, Germany; School of Molecular and Life Sciences, Curtin University, Perth 6845, Australia
| | - Lijun Wang
- College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
| | - Wenjun Zhang
- College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China.
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2
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Yu Y, Guo Z, Zhao Y, Kong K, Pan H, Xu X, Tang R, Liu Z. A Flexible and Degradable Hybrid Mineral as a Plastic Substitute. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2107523. [PMID: 34962676 DOI: 10.1002/adma.202107523] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Revised: 12/08/2021] [Indexed: 06/14/2023]
Abstract
The development of environmentally friendly plastics is critical to ensure sustainable development. In contrast to polymer plastics derived from petrochemicals, inorganic minerals, which are the most abundant matter in Earth's crust, are environmentally friendly. However, the brittleness of these minerals limits their applications as plastics. Here, because of the advantages of both biomineralization and inorganic ionic polymerization, the calcium phosphate (CaP, a typical geological and biological mineral) oligomers are used for biomimetic mineralization under the regulation of polyvinyl alcohol and sodium alginate, resulting in flexible CaP nanofibers with periodic structural defects. The assembly of CaP nanofibers produces a hierarchically structured bulk hybrid mineral (HM), which overcomes the intrinsic brittleness of minerals and exhibits plasticity characteristics. HM exhibits better hardness and thermostability than classical polymer plastics due to its dominant mineral composition. Notably, HM is environmentally friendly and degradable in nature, as it can potentially participate in geological cycles, indicating that this material is an optimal plastic substitute. The construction of periodic structural defects within flexible minerals expands the current understanding of materials science.
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Affiliation(s)
- Yadong Yu
- Department of Chemistry, Zhejiang University, Hangzhou, Zhejiang, 310027, China
| | - Zhengxi Guo
- Department of Chemistry, Zhejiang University, Hangzhou, Zhejiang, 310027, China
| | - Yueqi Zhao
- Department of Chemistry, Zhejiang University, Hangzhou, Zhejiang, 310027, China
| | - Kangren Kong
- Department of Chemistry, Zhejiang University, Hangzhou, Zhejiang, 310027, China
| | - Haihua Pan
- Qiushi Academy for Advanced Studies, Zhejiang University, Hangzhou, Zhejiang, 310027, China
| | - Xurong Xu
- Qiushi Academy for Advanced Studies, Zhejiang University, Hangzhou, Zhejiang, 310027, China
| | - Ruikang Tang
- Department of Chemistry, Zhejiang University, Hangzhou, Zhejiang, 310027, China
- State Key Laboratory for Silicon Materials, Zhejiang University, Hangzhou, Zhejiang, 310027, China
| | - Zhaoming Liu
- Department of Chemistry, Zhejiang University, Hangzhou, Zhejiang, 310027, China
- State Key Laboratory for Silicon Materials, Zhejiang University, Hangzhou, Zhejiang, 310027, China
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3
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Colaço E, Brouri D, Aissaoui N, Cornette P, Dupres V, Domingos RF, Lambert JF, Maisonhaute E, Kirat KE, Landoulsi J. Hierarchical Collagen–Hydroxyapatite Nanostructures Designed through Layer-by-Layer Assembly of Crystal-Decorated Fibrils. Biomacromolecules 2019; 20:4522-4534. [DOI: 10.1021/acs.biomac.9b01299] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Elodie Colaço
- Laboratoire de Biomécanique & Bioingénierie, CNRS, Université de Technologie de Compiègne, BP 20529, F-60205 Compiègne Cedex, France CNRS 7154, 75205 Paris, Cedex 05, France
| | - Dalil Brouri
- Sorbonne Université, CNRS, Laboratoire de Réactivité de Surface, F-75005 Paris, France
| | - Nesrine Aissaoui
- Centre de Biochimie Structurale, CNRS, INSERM, Université de Montpellier, 34090 Montpellier, France
| | - Pauline Cornette
- Sorbonne Université, CNRS, Laboratoire de Réactivité de Surface, F-75005 Paris, France
| | - Vincent Dupres
- Cellular Microbiology and Physics of Infections−Lille Center for Infection and Immunity, Institut Pasteur de Lille-CNRS-INSERM U1019-CHRU Lille, University of Lille, Lille, France
| | - Rute F. Domingos
- Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris Diderot, CNRS, 75205 Paris, Cedex 05, France
| | - Jean-François Lambert
- Sorbonne Université, CNRS, Laboratoire de Réactivité de Surface, F-75005 Paris, France
| | - Emmanuel Maisonhaute
- Sorbonne Université, CNRS, Laboratoire Interfaces et Systèmes Electrochimiques, F-75005 Paris, France
| | - Karim El Kirat
- Laboratoire de Biomécanique & Bioingénierie, CNRS, Université de Technologie de Compiègne, BP 20529, F-60205 Compiègne Cedex, France CNRS 7154, 75205 Paris, Cedex 05, France
| | - Jessem Landoulsi
- Laboratoire de Biomécanique & Bioingénierie, CNRS, Université de Technologie de Compiègne, BP 20529, F-60205 Compiègne Cedex, France CNRS 7154, 75205 Paris, Cedex 05, France
- Sorbonne Université, CNRS, Laboratoire de Réactivité de Surface, F-75005 Paris, France
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4
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Pyo E, Lee K, Jang MJ, Ko I, Kim CS, Choi SM, Lee S, Kwon K. Cobalt Incorporated Hydroxyapatite Catalyst for Water Oxidation. ChemCatChem 2019. [DOI: 10.1002/cctc.201901421] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Eunji Pyo
- Department of ChemistryGyeongsang National University (GNU)Research Institute of Natural Science(RINS) Jinju 52828 South Korea
| | - Keunyoung Lee
- Department of ChemistryGyeongsang National University (GNU)Research Institute of Natural Science(RINS) Jinju 52828 South Korea
| | - Myeong Je Jang
- Surface Technology DivisionKorea Institute of Materials Science Changwon 51508 South Korea
- Advanced Materials EngineeringKorea University of Science and Technology (UST) Daejeon 34113 South Korea
| | - In‐Hwan Ko
- Analysis & Certification CenterKorea Institute of Ceramic Engineering & Technology Jinju 52851 South Korea
| | - Chung Soo Kim
- Analysis & Certification CenterKorea Institute of Ceramic Engineering & Technology Jinju 52851 South Korea
| | - Sung Mook Choi
- Surface Technology DivisionKorea Institute of Materials Science Changwon 51508 South Korea
| | - Seonhong Lee
- Analysis & Certification CenterKorea Institute of Ceramic Engineering & Technology Jinju 52851 South Korea
| | - Ki‐Young Kwon
- Department of ChemistryGyeongsang National University (GNU)Research Institute of Natural Science(RINS) Jinju 52828 South Korea
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5
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Faidt T, Zeitz C, Grandthyll S, Hans M, Hannig M, Jacobs K, Müller F. Time Dependence of Fluoride Uptake in Hydroxyapatite. ACS Biomater Sci Eng 2017; 3:1822-1826. [DOI: 10.1021/acsbiomaterials.6b00782] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Thomas Faidt
- Experimental
Physics, Faculty of Natural Sciences and Technology, Saarland University, 66123 Saarbrücken, Germany
| | - Christian Zeitz
- Experimental
Physics, Faculty of Natural Sciences and Technology, Saarland University, 66123 Saarbrücken, Germany
| | - Samuel Grandthyll
- Experimental
Physics, Faculty of Natural Sciences and Technology, Saarland University, 66123 Saarbrücken, Germany
| | - Michael Hans
- Functional
Materials, Faculty of Natural Sciences and Technology, Saarland University, 66123 Saarbrücken, Germany
| | - Matthias Hannig
- Clinic
of Operative Dentistry, Periodontology and Preventive Dentistry, Faculty
of Medicine-Clinical Medicine, Saarland University Hospital, 66421 Homburg, Germany
| | - Karin Jacobs
- Experimental
Physics, Faculty of Natural Sciences and Technology, Saarland University, 66123 Saarbrücken, Germany
| | - Frank Müller
- Experimental
Physics, Faculty of Natural Sciences and Technology, Saarland University, 66123 Saarbrücken, Germany
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Reyes-Gasga J, Hémmerlé J, Brès EF. Aberration-Corrected Transmission Electron Microscopic Study of the Central Dark Line Defect in Human Tooth Enamel Crystals. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2016; 22:1047-1055. [PMID: 27628086 DOI: 10.1017/s1431927616011648] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Angstrom resolution images of human tooth enamel (HTE) crystallites were obtained using aberration-corrected high-resolution transmission electron microscopy and atomic-resolution scanning transmission electron microscopy in the modes of bright field, annular dark field, and high-angle annular dark-field. Images show that the central dark line (CDL) defect observed around the center of the HTE crystals is a site for caries formation in the HTE and has a thickness of ~0.2 nm. Results also suggest that the CDL goes through one of the OH- planes.
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Affiliation(s)
- José Reyes-Gasga
- 1Instituto de Física,UNAM. Circuito de la Investigación s/n,Ciudad Universitaria.04510 Coyoacan,México,D.F.,México
| | - Joseph Hémmerlé
- 2INSERM UMR_S 1121,Faculté de Chirurgie Dentaire,Université de Strasbourg,67085 Strasbourg,France
| | - Etienne F Brès
- 3UMET,Bâtiment C6,Université de Lille 1-Sciences et Technologies,59650 Villeneuve d'Ascq,France
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7
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Jung K, Kim Y, Chung WJ, Kwon KY. Hydroxyapatite Supported Ruthenium Catalysts for Hydrogen Generation from Borane Dimethyl Amine. B KOREAN CHEM SOC 2015. [DOI: 10.1002/bkcs.10596] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Kyungmun Jung
- Department of Chemistry, Research Institute of Natural Science; Gyeongsang National University; Jinju 660-701 Korea
| | - Youngyong Kim
- Department of Chemistry, Research Institute of Natural Science; Gyeongsang National University; Jinju 660-701 Korea
| | - Woo-Jae Chung
- Department of Genetic Engineering, College of Biotechnology & Bioengineering; Sungkyunkwan University; Suwon 440-746 Korea
| | - Ki-Young Kwon
- Department of Chemistry, Research Institute of Natural Science; Gyeongsang National University; Jinju 660-701 Korea
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8
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Li X, Li H, Yang G. Promoting the Adsorption of Metal Ions on Kaolinite by Defect Sites: A Molecular Dynamics Study. Sci Rep 2015; 5:14377. [PMID: 26403873 PMCID: PMC4585903 DOI: 10.1038/srep14377] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2015] [Accepted: 08/25/2015] [Indexed: 11/26/2022] Open
Abstract
Defect sites exist abundantly in minerals and play a crucial role for a variety of important processes. Here molecular dynamics simulations are used to comprehensively investigate the adsorption behaviors, stabilities and mechanisms of metal ions on defective minerals, considering different ionic concentrations, defect sizes and contents. Outer-sphere adsorbed Pb2+ ions predominate for all models (regular and defective), while inner-sphere Na+ ions, which exist sporadically only at concentrated solutions for regular models, govern the adsorption for all defective models. Adsorption quantities and stabilities of metal ions on kaolinite are fundamentally promoted by defect sites, thus explaining the experimental observations. Defect sites improve the stabilities of both inner- and outer-sphere adsorption, and (quasi) inner-sphere Pb2+ ions emerge only at defect sites that reinforce the interactions. Adsorption configurations are greatly altered by defect sites but respond weakly by changing defect sizes or contents. Both adsorption quantities and stabilities are enhanced by increasing defect sizes or contents, while ionic concentrations mainly affect adsorption quantities. We also find that adsorption of metal ions and anions can be promoted by each other and proceeds in a collaborative mechanism. Results thus obtained are beneficial to comprehend related processes for all types of minerals.
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Affiliation(s)
- Xiong Li
- College of Resources and Environment &Chongqing Key Laboratory of Soil Multi-scale Interfacial Process, Southwest University, Chongqing 400715, China
| | - Hang Li
- College of Resources and Environment &Chongqing Key Laboratory of Soil Multi-scale Interfacial Process, Southwest University, Chongqing 400715, China
| | - Gang Yang
- College of Resources and Environment &Chongqing Key Laboratory of Soil Multi-scale Interfacial Process, Southwest University, Chongqing 400715, China
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9
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Qin L, Zhang W, Lu J, Stack AG, Wang L. Direct imaging of nanoscale dissolution of dicalcium phosphate dihydrate by an organic ligand: concentration matters. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2013; 47:13365-13374. [PMID: 24251349 DOI: 10.1021/es402748t] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Unraveling the kinetics and mechanisms of sparingly soluble calcium orthophosphate (Ca-P) dissolution in the presence of organic acids at microscopic levels is important for an improved understanding in determining the effectiveness of organic acids present in most rhizosphere environments. Herein, we use in situ atomic force microscopy (AFM) coupled with a fluid reaction cell to image dissolution on the (010) face of brushite, CaHPO4 · 2H2O, in citrate-bearing solutions over a broad concentration range. We directly measure the dependence of molecular step retreat rate on citrate concentration at various pH values and ionic strengths, relevant to soil solution conditions. We find that low concentrations of citrate (10-100 μM) induced a reduction in step retreat rates along both the [100]Cc and [101]Cc directions. However, at higher concentrations (exceeding 0.1 mM), this inhibitory effect was reversed with step retreat speeds increasing rapidly. These results demonstrate that the concentration-dependent modulation of nanoscale Ca-P phase dissolution by citrate may be applied to analyze the controversial role of organic acids in enhancing Ca-P mineral dissolution in a more complex rhizosphere environment. These in situ observations may contribute to resolving the previously unrecognized interactions of root exudates (low molecular weight organic acids) and sparingly soluble Ca-P minerals.
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Affiliation(s)
- Lihong Qin
- College of Resources and Environment, Huazhong Agricultural University , Wuhan 430070, China
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10
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Kim S, Jung JH, Kim DH, Woo DK, Park JB, Choi MY, Kwon KY. Preparation of Ruthenium Incorporated Heterogeneous Catalysts Using Hydroxyapatite as Catalytic Supports for Aerobic Oxidation of Alcohols. B KOREAN CHEM SOC 2013. [DOI: 10.5012/bkcs.2013.34.1.221] [Citation(s) in RCA: 4] [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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11
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García-Tuñón E, Couceiro R, Franco J, Saiz E, Guitián F. Synthesis and characterisation of large chlorapatite single-crystals with controlled morphology and surface roughness. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2012; 23:2471-2482. [PMID: 22806077 PMCID: PMC3638812 DOI: 10.1007/s10856-012-4717-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2012] [Accepted: 07/03/2012] [Indexed: 06/01/2023]
Abstract
This work describes the synthesis of chlorapatite single crystals using the molten salt method with CaCl(2) as a flux. By manipulating the processing conditions (amount of flux, firing time and temperature, and cooling rates) it is possible to manipulate the crystal morphology from microscopic fibres to large crystals (up to few millimetre long and ~100 μm thick). The crystal roughness can be controlled to achieve very flat surfaces by changing the melt composition "in situ" at high temperature. The Young modulus and hardness of the crystals are 110 ± 15 and 6.6 ± 1.5 GPa respectively as measured by nanoindentation. Crystal dissolution in Hanks solution starts around the defects. Several in vitro assays were performed; ClAp crystals with different size and shape are biocompatible. Cell apoptosis was very low at 5, 10, and 15 days (Caspase-3) for all the samples. Proliferation (MTT) showed to be influenced by surface roughness and size of the crystals.
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Affiliation(s)
- Esther García-Tuñón
- Instituto de Cerámica de Galicia, Universidad Santiago de Compostela, Avda Mestre Mateo S/N, 15706 Santiago de Compostela, Spain.
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12
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García-Tuñón E, Dacuña B, Zaragoza G, Franco J, Guitián F. Cl–OH ion-exchanging process in chlorapatite (Ca5(PO4)3Cl
x
(OH)1 − x
) – a deep insight. ACTA CRYSTALLOGRAPHICA SECTION B: STRUCTURAL SCIENCE 2012; 68:467-79. [DOI: 10.1107/s0108768112019520] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2011] [Accepted: 05/01/2012] [Indexed: 11/10/2022]
Abstract
We have synthesized large chlorapatite [ClAp, Ca5(PO4)3Cl
x
(OH)1 − x
, where x = 1] single crystals using the molten salt method. We have corroborated that the hexagonal symmetry P63/m describes the crystal structure best, even though the crystals are synthetic and stoichiometric. Moreover, we have performed several thermal treatments on these ClAp crystals, generating new single crystals in the apatite system [Ca5(PO4)3Cl
x
(OH)1 − x
, where x ≤ 1], where the chloride anions (Cl−) were systematically substituted by hydroxyl anions (OH−). These new single crystals were methodically characterized by powder and single-crystal X-ray diffraction (SXRD), scanning electron microscopy (SEM), Fourier transform–IR spectroscopy (FT–IR), and energy-dispersive X-ray spectroscopy (EDS). We have discovered a previously unreported OH− inclusion site substituting the Cl− anion during the ion-exchanging process. Finally, we evaluated the atomic rearrangements of the other species involved in the structure. These movements are associated with ionic exchange, which can be justified from an energetic point of view. We also found a novel phase transformation at high temperature. When the crystals are heated over 1753 K the apatite system evolves to a less ordered monoclinic structure, in which the complete loss of the species in the anionic channel (Cl−, OH−) has been confirmed.
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Dorozhkin SV. Dissolution mechanism of calcium apatites in acids: A review of literature. World J Methodol 2012; 2:1-17. [PMID: 25237611 PMCID: PMC4145559 DOI: 10.5662/wjm.v2.i1.1] [Citation(s) in RCA: 83] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/23/2011] [Revised: 02/17/2012] [Accepted: 02/21/2012] [Indexed: 02/06/2023] Open
Abstract
Eight dissolution models of calcium apatites (both fluorapatite and hydroxyapatite) in acids were drawn from the published literature, analyzed and discussed. Major limitations and drawbacks of the models were conversed in details. The models were shown to deal with different aspects of apatite dissolution phenomenon and none of them was able to describe the dissolution process in general. Therefore, an attempt to combine the findings obtained by different researchers was performed which resulted in creation of the general description of apatite dissolution in acids. For this purpose, eight dissolution models were assumed to complement each other and provide the correct description of the specific aspects of apatite dissolution. The general description considers all possible dissolution stages involved and points out to some missing and unclear phenomena to be experimentally studied and verified in future. This creates a new methodological approach to investigate reaction mechanisms based on sets of affine data, obtained by various research groups under dissimilar experimental conditions.
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14
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Chung WJ, Kwon KY, Song J, Lee SW. Evolutionary screening of collagen-like peptides that nucleate hydroxyapatite crystals. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:7620-7628. [PMID: 21291244 DOI: 10.1021/la104757g] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The biogenesis of inorganic/organic composite materials such as bone typically involves the process of templated mineralization. Biomimetic synthesis of bone-like materials therefore requires the development of organic scaffolds that mediate mineralization of hydroxyapatite (HAP), the major inorganic component of bone. Using phage display, we identified a 12-residue peptide that bound to single-crystal HAP and templated the nucleation and growth of crystalline HAP mineral in a sequence- and composition-dependent manner. The sequence responsible for the mineralizing activity resembled the tripeptide repeat (Gly-Pro-Hyp) of type I collagen, a major component of bone extracellular matrix. Using a panel of synthetic peptides, we defined the structural features required for mineralizing activity. The results support a model for the cooperative noncovalent interaction of the peptide with HAP and suggest that native collagen may have a mineral-templating function in vivo. We expect this short HAP-binding peptide to be useful in the synthesis of three-dimensional bone-like materials.
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Affiliation(s)
- Woo-Jae Chung
- Department of Bioengineering, University of California, Berkeley, Berkeley, California 94720, USA
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15
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Kwon KY, Wang E, Nofal M, Lee SW. Microscopic study of hydroxyapatite dissolution as affected by fluoride ions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:5335-5339. [PMID: 21456602 DOI: 10.1021/la200325d] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Fluoride ions play a critical role in preventing tooth decay. We investigated the microscopic effects of fluoride ions on hydroxyapatite (100) surface dissolution using in situ atomic force microscopy. In the presence of 10 mM NaF, individual surface step retraction velocities decreased by about a factor of 5 as compared to NaF-free conditions. Importantly, elongated hexagonal etch pits, which are characteristic of (100) surface dissolution, were no longer observed when NaF was present. The alteration of pit shape is more distinct at a higher NaF concentration (50 mM) where triangular etch pits evolved during dissolution. Furthermore, in a fluoride concentration typical for tap water (10 μM), we observed roughening of individual step lines, resulting in the formation of scalloped morphologies. Morphological changes to individual steps across a wide range of fluoride concentrations suggest that the cariostatic capabilities of fluoride ions originate from their strong interactions with molecular steps.
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Affiliation(s)
- Ki-Young Kwon
- Department of Bioengineering, University of California, Berkeley, and Physical Biosciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States
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16
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Wang L, Lu J, Xu F, Zhang F. Dynamics of crystallization and dissolution of calcium orthophosphates at the near-molecular level. ACTA ACUST UNITED AC 2011. [DOI: 10.1007/s11434-010-4184-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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17
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Puvvada N, Panigrahi PK, Pathak A. Room temperature synthesis of highly hemocompatible hydroxyapatite, study of their physical properties and spectroscopic correlation of particle size. NANOSCALE 2010; 2:2631-2638. [PMID: 20959924 DOI: 10.1039/c0nr00611d] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Needle shaped nanoparticles of hydroxyapatite (HA) have been synthesized at room temperature using orthophosphoric acid as the source of (PO4)3- ions, while calcium chloride, the calcium source, is suitably complexed with citric acid/tartaric acid/acetic acid. The presence of ligands inhibits the growth along [001] and [100] directions of the crystal and thus, helps in formation of needle shaped nanoparticles. The chemical compositions of the samples have been established through AAS and FTIR spectroscopy, while the crystallinity has been assessed through XRD and by the spectral changes in the υ1 and υ3 frequencies of the phosphate group in the respective FTIR spectra. The particle sizes of the samples have been determined from line broadening studies and correlations have been established between the curve fitted percentage area of FTIR and full width half height (FWHH) of the XRD peaks. TEM studies revealed the particle to be needle-shaped with a length and diameter in the range of 20-65 nm and 4-11 nm respectively. Changes in the surface charge of the water dispersed HA samples have been determined at different pH and the isoelectric point for the samples have been found in the range of 3.1-3.4. Finally, the morphology, surface area and hemocompatibility characteristics of the HA samples, prepared by using different complexing agents, have been compared.
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Affiliation(s)
- Nagaprasad Puvvada
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, 721302, West Bengal, India.
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Kwon KY, Wang E, Chang N, Lee SW. Characterization of the dominant molecular step orientations on hydroxyapatite (100) surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:7205-7208. [PMID: 19496551 DOI: 10.1021/la900824n] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Hydroxyapatite (HAP) is the major inorganic component of bones and teeth. The characterization of HAP surfaces on the molecular level is important for achieving a fundamental understanding of bone remodeling and dental caries processes. On the microscopic level, hydroxyapatite growth and dissolution reactions mainly occur at steps. Therefore, this study focuses on individual molecular steps on HAP (100) facets under both static conditions and dynamic dissolution conditions using atomic force microscopy (AFM). We found that molecular steps parallel to the elongated axes of HAP crystals and those angled approximately 54 degrees against the elongated axis are not only energetically favorable but also kinetically dominant under dissolution conditions.
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Affiliation(s)
- Ki-Young Kwon
- Department of Bioengineering, University of California, Berkeley, Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley Nanoscience and Nanoengineering Institute, Berkeley, California 94720, USA
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