1
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Self-assembly and nanostructure of poly(vinyl alcohol)-graft-poly(methyl methacrylate) amphiphilic nanoparticles. J Colloid Interface Sci 2019; 553:512-523. [DOI: 10.1016/j.jcis.2019.06.047] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2019] [Revised: 06/14/2019] [Accepted: 06/15/2019] [Indexed: 01/08/2023]
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2
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Schlachet I, Trousil J, Rak D, Knudsen KD, Pavlova E, Nyström B, Sosnik A. Chitosan-graft-poly(methyl methacrylate) amphiphilic nanoparticles: Self-association and physicochemical characterization. Carbohydr Polym 2019; 212:412-420. [PMID: 30832875 DOI: 10.1016/j.carbpol.2019.02.022] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Revised: 02/03/2019] [Accepted: 02/08/2019] [Indexed: 02/09/2023]
Abstract
In this work, we synthesized and characterized the self-assembly behavior of a chitosan-poly(methyl methacrylate) graft copolymer and the properties of the formed nanoparticles by static and dynamic light scattering, small-angle neutron scattering, and transmission electron microscopy. Overall, our results indicate that the hydrophobization of the chitosan side-chain with PMMA leads to a complex array of small unimolecular and/or small-aggregation number "building blocks" that further self-assemble into larger amphiphilic nanoparticles.
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Affiliation(s)
- Inbar Schlachet
- Laboratory of Pharmaceutical Nanomaterials Science, Department of Materials Science and Engineering, Technion-Israel Institute of Technology, 320003 Haifa, Israel
| | - Jiří Trousil
- Institute of Macromolecular Chemistry, Czech Academy of Sciences, Heyrovského náměstí 2, 162 06 Prague 6, Czechia; Department of Analytical Chemistry, Charles University, Faculty of Science, Hlavova 8, 128 43 Prague 2, Czechia
| | - Dmytro Rak
- Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 040 01 Košice, Slovakia
| | - Kenneth D Knudsen
- Department of Physics, Institute for Energy Technology, P. O. Box 40, N-2027 Kjeller, Norway
| | - Ewa Pavlova
- Institute of Macromolecular Chemistry, Czech Academy of Sciences, Heyrovského náměstí 2, 162 06 Prague 6, Czechia
| | - Bo Nyström
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
| | - Alejandro Sosnik
- Laboratory of Pharmaceutical Nanomaterials Science, Department of Materials Science and Engineering, Technion-Israel Institute of Technology, 320003 Haifa, Israel.
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3
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Jäger A, Jäger E, Syrová Z, Mazel T, Kováčik L, Raška I, Höcherl A, Kučka J, Konefal R, Humajova J, Poučková P, Štěpánek P, Hrubý M. Poly(ethylene oxide monomethyl ether)- block-poly(propylene succinate) Nanoparticles: Synthesis and Characterization, Enzymatic and Cellular Degradation, Micellar Solubilization of Paclitaxel, and in Vitro and in Vivo Evaluation. Biomacromolecules 2018; 19:2443-2458. [PMID: 29601729 DOI: 10.1021/acs.biomac.8b00048] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Polyester-based nanostructures are widely studied as drug-delivery systems due to their biocompatibility and biodegradability. They are already used in the clinic. In this work, we describe a new and simple biodegradable and biocompatible system as the Food and Drug Administration approved polyesters (poly-ε-caprolactone, polylactic acid, and poly(lactic- co-glycolic acid)) for the delivery of the anticancer drug paclitaxel (PTX) as a model drug. A hydrophobic polyester, poly(propylene succinate) (PPS), was prepared from a nontoxic alcohol (propylene glycol) and monomer from the Krebs's cycle (succinic acid) in two steps via esterification and melt polycondensation. Furthermore, their amphiphilic block copolyester, poly(ethylene oxide monomethyl ether)- block-poly(propylene succinate) (mPEO- b-PPS), was prepared by three steps via esterification followed by melt polycondensation and the addition of mPEO to the PPS macromolecules. Analysis of the in vitro cellular behavior of the prepared nanoparticle carriers (NPs) (enzymatic degradation, uptake, localization, and fluorescence resonance energy-transfer pair degradation studies) was performed by fluorescence studies. PTX was loaded to the NPs of variable sizes (30, 70, and 150 nm), and their in vitro release was evaluated in different cell models and compared with commercial PTX formulations. The mPEO- b-PPS copolymer analysis displays glass transition temperature < body temperature < melting temperature, lower toxicity (including the toxicity of their degradation products), drug solubilization efficacy, stability against spontaneous hydrolysis during transport in bloodstream, and simultaneous enzymatic degradability after uptake into the cells. The detailed cytotoxicity in vitro and in vivo tumor efficacy studies have shown the superior efficacy of the NPs compared with PTX and PTX commercial formulations.
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Affiliation(s)
- Alessandro Jäger
- Institute of Macromolecular Chemistry , Heyrovsky Square 2 , 162 06 Prague , Czech Republic
| | - Eliézer Jäger
- Institute of Macromolecular Chemistry , Heyrovsky Square 2 , 162 06 Prague , Czech Republic
| | | | | | | | | | - Anita Höcherl
- Institute of Macromolecular Chemistry , Heyrovsky Square 2 , 162 06 Prague , Czech Republic
| | - Jan Kučka
- Institute of Macromolecular Chemistry , Heyrovsky Square 2 , 162 06 Prague , Czech Republic
| | - Rafal Konefal
- Institute of Macromolecular Chemistry , Heyrovsky Square 2 , 162 06 Prague , Czech Republic
| | - Jana Humajova
- Institute of Biophysics and Informatics, First Faculty of Medicine , Charles University , Salmovska 1 , 120 00 Prague , Czech Republic
| | - Pavla Poučková
- Institute of Biophysics and Informatics, First Faculty of Medicine , Charles University , Salmovska 1 , 120 00 Prague , Czech Republic
| | - Petr Štěpánek
- Institute of Macromolecular Chemistry , Heyrovsky Square 2 , 162 06 Prague , Czech Republic
| | - Martin Hrubý
- Institute of Macromolecular Chemistry , Heyrovsky Square 2 , 162 06 Prague , Czech Republic
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4
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Sato K, Ichinoi R, Mizukami R, Serikawa T, Sasaki Y, Lutkenhaus J, Nishide H, Oyaizu K. Diffusion-Cooperative Model for Charge Transport by Redox-Active Nonconjugated Polymers. J Am Chem Soc 2018; 140:1049-1056. [DOI: 10.1021/jacs.7b11272] [Citation(s) in RCA: 86] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kan Sato
- Department
of Applied Chemistry, Waseda University, Tokyo 169-8555, Japan
| | - Rieka Ichinoi
- Department
of Applied Chemistry, Waseda University, Tokyo 169-8555, Japan
| | - Ryusuke Mizukami
- Department
of Applied Chemistry, Waseda University, Tokyo 169-8555, Japan
| | - Takuma Serikawa
- Department
of Applied Chemistry, Waseda University, Tokyo 169-8555, Japan
| | - Yusuke Sasaki
- Department
of Applied Chemistry, Waseda University, Tokyo 169-8555, Japan
| | - Jodie Lutkenhaus
- Artie McFerrin Department of Chemical Engineering, Texas A&M University, 3122 TAMU, College Station, Texas 77843-3122, United States
| | - Hiroyuki Nishide
- Department
of Applied Chemistry, Waseda University, Tokyo 169-8555, Japan
| | - Kenichi Oyaizu
- Department
of Applied Chemistry, Waseda University, Tokyo 169-8555, Japan
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5
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Nallet F. Scattering studies in self-organised diblock copolymer systems. Colloid Polym Sci 2017. [DOI: 10.1007/s00396-017-4082-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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6
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7
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Costa FN, Ibiapino AL, de Figueiredo LP, Barreiro EJ, Lima LM, do Amaral DN, de Castro CE, Giacomelli FC, Ferreira FF. Preliminary evaluation of the encapsulation of new antidiabetic sulphonylhydrazone and antitumor N-acylhydrazone derivatives using PLGA nanoparticles. ACTA ACUST UNITED AC 2015. [DOI: 10.1088/1742-6596/617/1/012015] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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8
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Severino P, Andreani T, Jäger A, Chaud MV, Santana MHA, Silva AM, Souto EB. Solid lipid nanoparticles for hydrophilic biotech drugs: Optimization and cell viability studies (Caco-2 & HEPG-2 cell lines). Eur J Med Chem 2014; 81:28-34. [DOI: 10.1016/j.ejmech.2014.04.084] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2013] [Revised: 04/14/2014] [Accepted: 04/29/2014] [Indexed: 12/20/2022]
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9
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Sergeeva O, Vlasov PS, Domnina NS, Bogomolova A, Konarev PV, Svergun DI, Walterova Z, Horsky J, Stepanek P, Filippov SK. Novel thermosensitive telechelic PEGs with antioxidant activity: synthesis, molecular properties and conformational behaviour. RSC Adv 2014. [DOI: 10.1039/c4ra06978a] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
We report on the tailor-made polymer conjugates, which are highly compelling for biomedical applications due to their antioxidant activity and the adjustable thermosensitive properties.
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Affiliation(s)
- Olga Sergeeva
- Institute of Chemistry
- Saint-Petersburg State University
- Russia
| | - Petr S. Vlasov
- Institute of Chemistry
- Saint-Petersburg State University
- Russia
| | - Nina S. Domnina
- Institute of Chemistry
- Saint-Petersburg State University
- Russia
| | | | | | | | | | - Jiri Horsky
- Institute of Macromolecular Chemistry
- Prague, Czech Republic
| | - Petr Stepanek
- Institute of Macromolecular Chemistry
- Prague, Czech Republic
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10
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Trousil J, Panek J, Hruby M, Matějková J, Kucka J, Stepanek P. Self-association of bee propolis: effects on pharmaceutical applications. JOURNAL OF PHARMACEUTICAL INVESTIGATION 2013. [DOI: 10.1007/s40005-013-0104-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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11
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de Oliveira AM, Jäger E, Jäger A, Stepánek P, Giacomelli FC. Physicochemical aspects behind the size of biodegradable polymeric nanoparticles: A step forward. Colloids Surf A Physicochem Eng Asp 2013. [DOI: 10.1016/j.colsurfa.2013.08.056] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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12
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Bakaeva Z, Černoch P, Štěpánek P, Nallet F, Noirez L. Critical behavior of nanoparticle-containing binary liquid mixtures. Phys Chem Chem Phys 2013; 15:5831-5. [PMID: 23487028 DOI: 10.1039/c3cp44052d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Simultaneous measurements of small-angle neutron scattering and dynamic light scattering have been performed on a binary mixture of partially miscible liquids, 2,6-dimethylpyridine and water. At critical composition the temperature dependence of the correlation length of fluctuations in composition is strongly affected by the addition of nanoparticles of a triblock copolymer polyethylene oxide-polypropylene oxide-polyethylene oxide. A crossover between Ising-type critical behavior and mean-field critical behavior is observed when the correlation length is equal to the size of the nanoparticles.
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Affiliation(s)
- Z Bakaeva
- Institute of Macromolecular Chemistry, Heyrovsky Sq. 2, 16206 Prague, Czech Republic.
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13
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Filippov SK, Seery TAP, Kříž J, Hruby M, Černoch P, Sedláček O, Kadlec P, Pánek J, Štěpánek P. Collective polyelectrolyte diffusion as a function of counterion size and dielectric constant. POLYM INT 2012. [DOI: 10.1002/pi.4410] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Sergey K Filippov
- Institute of Macromolecular Chemistry; Academy of Sciences of the Czech Republic; Heyrovsky Sq. 2 162 06 Prague 6 Czech Republic
| | - Thomas AP Seery
- Department of Chemistry; University of Connecticut; Storrs CT 06269 USA
- Polymer Program, Institute of Materials Science; University of Connecticut; Storrs CT 06269 USA
| | - Jaroslav Kříž
- Institute of Macromolecular Chemistry; Academy of Sciences of the Czech Republic; Heyrovsky Sq. 2 162 06 Prague 6 Czech Republic
| | - Martin Hruby
- Institute of Macromolecular Chemistry; Academy of Sciences of the Czech Republic; Heyrovsky Sq. 2 162 06 Prague 6 Czech Republic
| | - Peter Černoch
- Institute of Macromolecular Chemistry; Academy of Sciences of the Czech Republic; Heyrovsky Sq. 2 162 06 Prague 6 Czech Republic
| | - Ondřej Sedláček
- Institute of Macromolecular Chemistry; Academy of Sciences of the Czech Republic; Heyrovsky Sq. 2 162 06 Prague 6 Czech Republic
| | - Petr Kadlec
- Institute of Macromolecular Chemistry; Academy of Sciences of the Czech Republic; Heyrovsky Sq. 2 162 06 Prague 6 Czech Republic
| | - Jiří Pánek
- Institute of Macromolecular Chemistry; Academy of Sciences of the Czech Republic; Heyrovsky Sq. 2 162 06 Prague 6 Czech Republic
| | - Petr Štěpánek
- Institute of Macromolecular Chemistry; Academy of Sciences of the Czech Republic; Heyrovsky Sq. 2 162 06 Prague 6 Czech Republic
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14
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Škodová M, Černoch P, Štěpánek P, Chánová E, Kučka J, Kálalová Z, Kaňková D, Hrubý M. Self-assembled polymeric chelate nanoparticles as potential theranostic agents. Chemphyschem 2012; 13:4244-50. [PMID: 23132772 DOI: 10.1002/cphc.201200681] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2012] [Revised: 09/25/2012] [Indexed: 11/06/2022]
Abstract
Improvements in cancer diagnostics and therapy have recently attracted the interest of many different branches of science. This study presents one of the new possible approaches in the diagnostics and therapy of cancer by using polymeric chelates as carriers. Graft copolymers with a backbone containing 8-hydroxyquinoline-5-sulfonic acid chelating groups and poly(ethylene oxide) hydrophilic grafts are synthesized and characterized. The polymers assemble and form particles after the addition of a biometal cation, such as iron or copper. The obtained nanoparticles exhibit a hydrodynamic diameter of around 25 nm and a stability of at least several hours, which are counted as essential parameters for biomedical purposes. To prove their biodegradability, a model degradation with deferoxamine is performed and, together with high radiolabeling efficiency with copper-64, their possible use for nuclear medicine purposes is demonstrated.
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Affiliation(s)
- M Škodová
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic v.v.i., Czech Republic.
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15
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Pop-Georgievski O, Verreault D, Diesner MO, Proks V, Heissler S, Rypácek F, Koelsch P. Nonfouling poly(ethylene oxide) layers end-tethered to polydopamine. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:14273-83. [PMID: 22989020 PMCID: PMC3489920 DOI: 10.1021/la3029935] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Nonfouling surfaces capable of reducing protein adsorption are highly desirable in a wide range of applications. Coating of surfaces with poly(ethylene oxide) (PEO), a water-soluble, nontoxic, and nonimmunogenic polymer, is most frequently used to reduce nonspecific protein adsorption. Here we show how to prepare dense PEO brushes on virtually any substrate by tethering PEO to polydopamine (PDA)-modified surfaces. The chain lengths of hetero-bifunctional PEOs were varied in the range of 45-500 oxyethylene units (M(n) = 2000-20,000). End-tethering of PEO chains was performed through amine and thiol headgroups from reactive polymer melts to minimize excluded volume effects. Surface plasmon resonance (SPR) was applied to investigate the adsorption of model protein solutions and complex biologic medium (human blood plasma) to the densely packed PEO brushes. The level of protein adsorption of human serum albumin and fibrinogen solutions was below the detection limit of the SPR measurements for all PEO chains end-tethered to PDA, thus exceeding the protein resistance of PEO layers tethered directly on gold. It was found that the surface resistance to adsorption of lysozyme and human blood plasma increased with increasing length and brush character of the PEO chains end-tethered to PDA with a similar or better resistance in comparison to PEO layers on gold. Furthermore, the chain density, thickness, swelling, and conformation of PEO layers were determined using spectroscopic ellipsometry (SE), dynamic water contact angle (DCA) measurements, infrared reflection-absorption spectroscopy (IRRAS), and vibrational sum-frequency-generation (VSFG) spectroscopy, the latter in air and water.
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16
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Pánek J, Filippov SK, Hrubý M, Rabyk M, Bogomolova A, Kučka J, Štěpánek P. Thermoresponsive Nanoparticles Based on Poly(2-alkyl-2-Oxazolines) and Pluronic F127. Macromol Rapid Commun 2012; 33:1683-9. [DOI: 10.1002/marc.201200254] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2012] [Revised: 05/15/2012] [Indexed: 01/29/2023]
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17
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Slouf M, Hruby M, Bakaeva Z, Vlkova H, Nebesarova J, Philimonenko AA, Hozak P. Preparation of stable Pd nanocubes and their use in biological labeling. Colloids Surf B Biointerfaces 2012; 100:205-8. [PMID: 22771526 DOI: 10.1016/j.colsurfb.2012.05.023] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2012] [Revised: 05/20/2012] [Accepted: 05/21/2012] [Indexed: 11/16/2022]
Abstract
Stable Pd nanocubes (PdNC) with the average size ~15 nm were prepared by the controlled reduction of sodium tetrachloropalladate with ascorbic acid in water, in the presence of polyvinylpyrrolidone and potassium bromide. Morphology of the particles was characterized by transmission electron microscopy (TEM) and their stability in the colloidal solution was verified by dynamic light scattering (DLS). It has been demonstrated that the Pd nanocubes can be distinguished from commercial Au nanospheres in a standard TEM microscope by means of automated image analysis. In the next step, the PdNC were successfully conjugated to immunoglobulin proteins and used for the detection of a specific protein (nucleophosmin) on ultrathin sections of HeLa cells. Our experiments showed that PdNC can be used for multiple immunolabeling in combination with commercial Au nanospheres.
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Affiliation(s)
- Miroslav Slouf
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Prague, Czech Republic.
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18
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Filippov SK, Seery TA, Černoch P, Pánek J, Štěpánek P. Behavior of polyelectrolyte solutions in a wide range of solvent dielectric constant. Eur Polym J 2011. [DOI: 10.1016/j.eurpolymj.2011.05.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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19
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20
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Bansil R, Cao X, Bhaskar KR, Lamont JT. Gelation and aggregation of mucin in relation to the stomach's protective barrier. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/masy.19961090110] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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21
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Procházka K, Kiserow D, Ramireddy C, Webber SE, Munk P, Tuzar Z. Time-resolved fluorescence and light scattering studies of water-soluble block-copolymer micelles with polyelectrolyte shells. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/masy.19920580116] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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22
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Marek A, Czernek J, Steinhart M, Labský J, Štěpánek P, Pilař J. Local Segmental Dynamics of Poly(2-hydroxyethyl Methacrylate) in Methanolic Solution by Spin Label X-Band ESR. J Phys Chem B 2004. [DOI: 10.1021/jp036083y] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Antonín Marek
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, 162 06 Prague 6, Czech Republic
| | - Jiří Czernek
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, 162 06 Prague 6, Czech Republic
| | - Miloš Steinhart
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, 162 06 Prague 6, Czech Republic
| | - Jiří Labský
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, 162 06 Prague 6, Czech Republic
| | - Petr Štěpánek
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, 162 06 Prague 6, Czech Republic
| | - Jan Pilař
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, 162 06 Prague 6, Czech Republic
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23
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Shchyogolev SY. Inverse problems of spectroturbidimetry of biological disperse systems: an overview. JOURNAL OF BIOMEDICAL OPTICS 1999; 4:490-503. [PMID: 23014623 DOI: 10.1117/1.429954] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
The obtainment of stable solutions of inverse problems for studying the disperse composition of suspensions using effects of elastic light scattering was discussed. Versions of a regularization of solving the inverse problems of the spectroturbidimetric method were considered, taking into account unavoidable restrictions on the scope of the necessary prior data for particles and on the width of the spectral interval for real biological disperse systems. Possibilities for increasing the number of particle parameters determined in a single optical experiment were analyzed. They were shown to be provided by the use of effects of the orientation ordering of a system on combination of capabilities of the methods of spectroturbidimetry and electro-optics, using bacterial cell suspensions as an example. © 1999 Society of Photo-Optical Instrumentation Engineers.
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Helms MK, Marriott G, Sawyer WH, Jameson DM. Dynamics and morphology of the in vitro polymeric form of elongation factor Tu from Escherichia coli. BIOCHIMICA ET BIOPHYSICA ACTA 1996; 1291:122-30. [PMID: 8898872 DOI: 10.1016/0304-4165(96)00054-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Elongation factor Tu from Escherichia coli is known to polymerize at slightly acidic pH and low ionic strength. The structure and dynamics of these aggregates have been examined using imaging and spectroscopic methodologies. Electron microscopy provides evidence for two-dimensional sheets and bundled filaments of EF-Tu, whereas fluorescence microscopy of EF-Tu covalently labeled with tetramethylrhodamine isothiocyanate showed highly branched polymers of EF-Tu several microns in diameter. These polymers were studied using quasi-elastic light scattering to determine the evolution of the translational diffusion coefficient during the polymerization process. The rotational dynamics of the aggregate were investigated using phosphorescence anisotropy of EF-Tu covalently labeled with erythrosin isothiocyanate. A high infinite-time anisotropy was observed, suggesting a lack of motion or entanglement of EF-Tu polymers. A sub-microsecond motion which was slowed in the presence of glycerol may be due to local flexibility of the polymers. The possible relevance of polymeric EF-Tu to its function in vivo is discussed.
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Affiliation(s)
- M K Helms
- Department of Biochemistry and Biophysics, University of Hawaii, Honolulu 96822, USA
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25
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Hradil J, Koňák Č, Švec F. Reactive polymers. 59. An investigation of labelled glycidyl methacrylate-ethylene dimethacrylate copolymers by a fluorescence technique. ACTA ACUST UNITED AC 1989. [DOI: 10.1016/0923-1137(89)90097-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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26
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Miller BV, Lines RW. Recent Advances in Particle Size Measurements: A Critical Review. ACTA ACUST UNITED AC 1988. [DOI: 10.1080/00078988808048808] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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27
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Dynamic light scattering measurements on the polystyrene/ethyl acetate system at semi-dilute concentrations as a function of temperature. Polym Bull (Berl) 1987. [DOI: 10.1007/bf00261897] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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