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Characterization of luminescent hydroxyapatite@terbium complex core-shell composites using chlorobenzoic acid as ligands. J RARE EARTH 2020. [DOI: 10.1016/j.jre.2019.10.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Li Y, Shaker K, Svenda M, Vogt C, Hertz HM, Toprak MS. Synthesis and Cytotoxicity Studies on Ru and Rh Nanoparticles as Potential X-Ray Fluorescence Computed Tomography (XFCT) Contrast Agents. NANOMATERIALS (BASEL, SWITZERLAND) 2020; 10:E310. [PMID: 32059357 PMCID: PMC7075218 DOI: 10.3390/nano10020310] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/11/2020] [Revised: 02/06/2020] [Accepted: 02/07/2020] [Indexed: 12/16/2022]
Abstract
X-ray fluorescence computed tomography (XFCT) is an emerging biomedical imaging technique, which demands the development of new contrast agents. Ruthenium (Ru) and rhodium (Rh) have spectrally attractive Kα edge energies, qualifying them as new XFCT bio-imaging probes. Metallic Ru and Rh nanoparticles are synthesized by polyol method, in the presence of a stabilizer. The effect of several reaction parameters, including reaction temperature time, precursor and stabilizer concentration, and stabilizer molecular weight, on the size of particles, were studied. Resultant materials were characterized in detail using XRD, TEM, FT-IR, DLS-zeta potential and TGA techniques. Ru particles in the size range of 1-3 nm, and Rh particles of 6-9 nm were obtained. At physiological pH, both material systems showed agglomeration into larger assemblies ranging from 12-104 nm for Ru and 25-50 nm for Rh. Cytotoxicity of the nanoparticles (NPs) was evaluated on macrophages and ovarian cancer cells, showing minimal toxicity in doses up to 50 μg/mL. XFCT performance was evaluated on a small-animal-sized phantom model, demonstrating the possibility of quantitative evaluation of the measured dose with an expected linear response. This work provides a detailed route for the synthesis, size control and characterization of two materials systems as viable contrast agents for XFCT bio-imaging.
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Affiliation(s)
| | | | | | | | | | - Muhammet S. Toprak
- Biomedical and X-Ray Physics, Department of Applied Physics, KTH Royal Institute of Technology, SE 10691 Stockholm, Sweden; (Y.L.); (K.S.); (M.S.); (C.V.); (H.M.H.)
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Diao J, Bai F, Wang Y, Han Q, Xu X, Zhang H, Luo Q, Wang Y. Engineering of pectin-dopamine nano-conjugates for carrying ruthenium complex: A potential tool for biomedical applications. J Inorg Biochem 2019; 191:135-142. [DOI: 10.1016/j.jinorgbio.2018.11.016] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Revised: 11/22/2018] [Accepted: 11/25/2018] [Indexed: 11/27/2022]
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GALEMBECK FERNANDO, BURGO THIAGOA, SILVA DOUGLASSDA, SANTOS LEANDRAP. Materials from renewable resources: new properties and functions. AN ACAD BRAS CIENC 2019; 91:e20181160. [DOI: 10.1590/0001-3765201920181160] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2018] [Accepted: 02/05/2019] [Indexed: 11/22/2022] Open
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Bibi N, Guerra RB, Huamaní LESC, Formiga ALB. Crystal structure, electrochemical and spectroscopic investigation of mer-tris-[2-(1 H-imidazol-2-yl-κ N3)pyrimidine-κ N1]ruthenium(II) bis-(hexa-fluorido-phosphate) trihydrate. Acta Crystallogr E Crystallogr Commun 2018; 74:874-877. [PMID: 30002877 PMCID: PMC6038643 DOI: 10.1107/s2056989018007995] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Accepted: 05/30/2018] [Indexed: 11/17/2022]
Abstract
The crystal structure of the title compound, [Ru(C7H6N4)3](PF6)2·3H2O, a novel RuII complex with the bidentate ligand 2-(1H-imidazol-2-yl)pyrimidine, comprises a complex cation in the meridional form exclusively, with a distorted octa-hedral geometry about the ruthenium(II) cation. The Ru-N bonds involving imidazole N atoms are comparatively shorter than the Ru-N bonds from pyrimidine because of the stronger basicity of the imidazole moiety. The three-dimensional hydrogen-bonded network involves all species in the lattice with water mol-ecules inter-acting with both counter-ions and NH hydrogen atoms from the complex. The supra-molecular structure of the crystal also shows that two units of the complex bind strongly through a mutual N-H⋯N bond. The electronic absorption spectrum of the complex displays an asymmetric band at 421 nm, which might point to the presence of two metal-to-ligand charge-transfer (MLCT) bands. Electrochemical measurements show a quasi-reversible peak referring to the RuIII/RuII reduction at 0.87 V versus Ag/AgCl.
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Affiliation(s)
- Naheed Bibi
- Institute of Chemistry, University of Campinas – UNICAMP, PO Box 6154, 13083-970, Campinas, SP, Brazil
| | - Renan Barrach Guerra
- Institute of Chemistry, University of Campinas – UNICAMP, PO Box 6154, 13083-970, Campinas, SP, Brazil
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Wang Y, Pitto-Barry A, Habtemariam A, Romero-Canelon I, Sadler PJ, Barry NPE. Nanoparticles of chitosan conjugated to organo-ruthenium complexes. Inorg Chem Front 2016. [DOI: 10.1039/c6qi00115g] [Citation(s) in RCA: 72] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The synthesis of nanoparticles of conjugates of caffeic acid-modified chitosan with ruthenium arene complexes is described.
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Affiliation(s)
- Yanqing Wang
- Institute of Applied Chemistry and Environmental Engineering
- Yancheng Teachers University
- Yancheng City
- People's Republic of China
- Department of Chemistry
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Kokošková M, Štěpánek M, Šloufová I, Vlčková B. Steady-state and time-resolved luminescence of Ru(II) polypyridine complexes attached to Ag nanoparticles: Effect of chemisorption in comparison with electrostatic bonding. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 150:657-663. [PMID: 26093115 DOI: 10.1016/j.saa.2015.05.088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2014] [Revised: 05/19/2015] [Accepted: 05/25/2015] [Indexed: 06/04/2023]
Abstract
Steady state and nanosecond time resolved luminescence (namely, (3)MLCT phosphorescence) of [Ru(bpy)3](2+) and of [Ru(bpy)2(dcbpy)](2+)/bpy=2,2'-bipyridine; dcbpy=2,2'-bipyridyl-4,4'-dicarboxylic acid/attached to Ag NPs (the former by the electrostatic bonding, the latter by chemisorption) in non-aggregated Ag NP hydrosol systems has been investigated, and compared to the luminescence characteristics of the complexes in aqueous solutions. The intensity decrease of the 452 nm (and/or 455 nm, respectively) main band and elimination of the short wavelength shoulders in the excitation spectra and the intensity decrease of the emission spectra observed for both complexes upon their attachment to Ag NPs is attributed to the overlap of the excitation spectra with the surface plasmon extinction (SPE) of Ag NPs. The overlap leads to a loss of excitation energy by SPE as well as to a decrease of the (1)MLCT to (3)MLCT intersystem crossing efficiency. The time-resolved luminescence study shows that the (3)MLCT phosphorescence lifetimes of both complexes are markedly (by 3 and 4 orders of magnitude, respectively) shortened upon their attachment to Ag NPs. Nevertheless, the (3)MLCT lifetime of the chemisorbed [Ru(bpy)2(dcbpy)](2+) is by at least one order of magnitude shorter than that of the electrostatically bonded [Ru(bpy)3](2+), which indicates, that the phosphorescence lifetimes of these luminophores are strongly affected by the type of Ag NP surface-luminophore bonding.
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Affiliation(s)
- Markéta Kokošková
- Department of Physical and Macromolecular Chemistry, Charles University in Prague, Hlavova 8, Prague 2, 128 40, Czech Republic.
| | - Miroslav Štěpánek
- Department of Physical and Macromolecular Chemistry, Charles University in Prague, Hlavova 8, Prague 2, 128 40, Czech Republic
| | - Ivana Šloufová
- Department of Physical and Macromolecular Chemistry, Charles University in Prague, Hlavova 8, Prague 2, 128 40, Czech Republic
| | - Blanka Vlčková
- Department of Physical and Macromolecular Chemistry, Charles University in Prague, Hlavova 8, Prague 2, 128 40, Czech Republic.
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Liang C, Liu Q, Xu Z. Synthesis of Surface-Responsive Composite Particles by Dehydration of Water-in-Oil Emulsions. ACS APPLIED MATERIALS & INTERFACES 2015; 7:20631-20639. [PMID: 26302364 DOI: 10.1021/acsami.5b05093] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Organic composite particles were prepared by first emulsifying an aqueous sodium carboxymethyl cellulose (CMC) solution in a nonaqueous ethylcellulose (EC) solution, followed by dehydrating emulsified water droplets. CMC and EC are both biodegradable nontoxic materials, but have contrasting properties. CMC is a charged water-soluble polymer, while EC is an uncharged interfacially active water-insoluble polymer. The simple preparative method does not consume unnecessary chemical reagents and produces no waste material. The composite particles prepared by dehydrating emulsion droplets are readily dispersed in organic media due to its biwettable surface terminated with interfacially active EC molecules, which allows composite particles to preferentially adsorb at the oil-water droplet interface. The surface of composite particles, furthermore, is water-permeable, which allows water to be absorbed from emulsified droplets. The size, composition, and structure of the synthesized composite particles are ideally suited for absorption of stabilized water droplets from oil-continuous emulsions. The use of the composite absorbent particles, described herein, presents another viable strategy for dewatering water-in-oil emulsions.
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Affiliation(s)
- Chen Liang
- Chemical and Material Engineering, University of Alberta , 7th Floor, Electrical and Computer Engineering Research Facility (ECERF), 9107 - 116 Street, Edmonton, Alberta T6G 2V4, Canada
| | - Qingxia Liu
- Chemical and Material Engineering, University of Alberta , 7th Floor, Electrical and Computer Engineering Research Facility (ECERF), 9107 - 116 Street, Edmonton, Alberta T6G 2V4, Canada
| | - Zhenghe Xu
- Chemical and Material Engineering, University of Alberta , 7th Floor, Electrical and Computer Engineering Research Facility (ECERF), 9107 - 116 Street, Edmonton, Alberta T6G 2V4, Canada
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