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Jarand CW, McLeod MJ, Reed WF. Dialysis Monitoring of Ionic Strength and Denaturant Effects, and Their Reversibility, for Various Classes of Macromolecules. Biomacromolecules 2024. [PMID: 39073603 DOI: 10.1021/acs.biomac.4c00583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/30/2024]
Abstract
Monitoring membrane-mediated dialysis in real time with static and dynamic light scattering revealed distinctive differences, including reversibility/irreversibility, in the effects of ionic strength (NaCl) and the denaturant guanidine-HCl (Gd) on a synthetic polyelectrolyte and several types of biomacromolecules: protein, polysaccharide, and polyampholyte. Dialysis cycles against aqueous NaCl and Gd, and reverse back to the original aqueous solution, were monitored. The behavior of Na-polystyrenesulfonate was reversible and yielded a detailed polymer physics description. The biomacromolecules additionally showed hydrogen-bonding/hydrophobic (HP) interactions. An interpretive model was developed that considers the interplay among polyelectrolyte, polyampholyte, and HP potential energies in determining the different associative, aggregative, and dissociative behaviors. NaCl isolated purely electrostatic effects, whereas Gd combined electrostatic and HP effects. Some macromolecules showed partially reversible behavior, and others were completely irreversible. The dialysis monitoring method should prove useful for investigating fundamental macromolecular and colloid properties and for drug formulation and stability optimization.
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Affiliation(s)
- Curtis W Jarand
- Tulane University, New Orleans, Louisiana 70115, United States
| | | | - Wayne F Reed
- Tulane University, New Orleans, Louisiana 70115, United States
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2
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Dipole-driven interlude of mesomorphism in polyelectrolyte solutions. Proc Natl Acad Sci U S A 2022; 119:e2204163119. [PMID: 36161915 DOI: 10.1073/pnas.2204163119] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Uniformly charged polyelectrolyte molecules disperse uniformly in aqueous electrolyte solutions, due to electrostatic repulsion between them. In stark contrast to this well-established result of homogeneous polyelectrolyte solutions, we report a phenomenon where an aqueous solution of positively charged poly(L-lysine) (PLL) exhibits precipitation of similarly charged macromolecules at low ionic strength and a homogeneous solution at very high ionic strength, with a stable mesomorphic state of spherical aggregates as an interlude between these two limits. The precipitation at lower ionic strengths that is orthogonal to the standard polyelectrolyte behavior and the emergence of the mesomorphic state are triggered by the presence of a monovalent small organic anion, acrylate, in the electrolyte solution. Using light scattering, we find that the hydrodynamic radius Rh of isolated PLL chains shrinks upon a decrease in electrolyte (NaBr) concentration, exhibiting the "anti-polyelectrolyte effect." In addition, Rh of the aggregates in the mesomorphic state depends on PLL concentration cp according to the scaling law, [Formula: see text]. Furthermore, at higher PLL concentration, the mesomorphic aggregates disassemble by a self-poisoning mechanism. We conjecture that all these findings can be attributed to both intra- and interchain dipolar interactions arising from the transformation of polycationic PLL into a physical polyzwitterionic PLL at higher concentrations of acrylate. The reported phenomenon of PLL exhibiting dipole-directed assembly of mesomorphic states and the anti-polyelectrolyte effect are of vital importance toward understanding more complex situations such as coacervation and formation of biomolecular condensates.
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3
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Khemissi H, Ahmed KF, Aschi A. Structural transitions and rheological properties of poly-d-lysine hydrobromide: effect of pH, salt, temperature, and shear rate. JOURNAL OF POLYMER ENGINEERING 2022. [DOI: 10.1515/polyeng-2021-0261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
In this work, we analyzed the pH, temperature, and salt effects of the charged polypeptide and its size, poly-d-lysine (PDL) molecules while applying dynamic light scattering (DLS), Zeta potential, and rheology techniques to assess the most important characteristics of PDL. The experimental results showed that the structural transitions of PDL were a result of a competition between electrostatic interaction, which promotes an extended state, and the hydrophobic effect, which favors a compact state. Moreover, by exploiting the electrokinetic charge on the PDL molecules the zeta potential was determined. We tried to find an analogy between size, viscosity, and conformational changes of PDL so to serve as a guide for polypeptide aggregation in solution.
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Affiliation(s)
- Héla Khemissi
- LR99ES16 Laboratoire de Physique de la Matière Molle et de la Modélisation Électromagnétique , Faculté des Sciences de Tunis, Université de Tunis El Manar , 2092 Tunis , Tunisia
| | - Khouloud Fekih Ahmed
- LR99ES16 Laboratoire de Physique de la Matière Molle et de la Modélisation Électromagnétique , Faculté des Sciences de Tunis, Université de Tunis El Manar , 2092 Tunis , Tunisia
| | - Adel Aschi
- LR99ES16 Laboratoire de Physique de la Matière Molle et de la Modélisation Électromagnétique , Faculté des Sciences de Tunis, Université de Tunis El Manar , 2092 Tunis , Tunisia
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4
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Stellwagen NC. Using capillary electrophoresis to characterize the hydrodynamic and electrostatic properties of DNA in solutions containing various monovalent cations. Electrophoresis 2021; 43:309-326. [PMID: 34510492 DOI: 10.1002/elps.202100176] [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: 06/11/2021] [Revised: 08/27/2021] [Accepted: 09/03/2021] [Indexed: 11/08/2022]
Abstract
This review describes the results obtained by using free-solution capillary electrophoresis to probe the electrostatic and hydrodynamic properties of DNA in solutions containing various monovalent cations. In brief, we found that the mobilities of double-stranded DNAs (dsDNAs) increase with increasing molecular weight before leveling off and becoming constant at molecular weights ≥400 bp. The mobilities of single-stranded DNAs (ssDNAs) go through a maximum at ∼10-20 nucleotides before decreasing and becoming constant for oligomers larger than ∼30-50 bases. The mobilities of both ss- and dsDNAs increase linearly with the logarithm of increasing charge per unit length and decrease linearly with the logarithm of increasing ionic strength. Surprisingly, ss- and dsDNA mobilities level off and become nearly constant at ionic strengths ≥0.6 M. The thermal stabilities of dsDNAs decrease linearly with increasing solution viscosity. The diffusion coefficients of dsDNA are modulated by the diffusion coefficients of their counterions because of electrostatic DNA-cation coupling interactions. Finally, the anomalously slow mobilities observed for A-tract-containing DNAs can be attributed both to differences in shape and to the preferential localization of small cations in the A-tract minor groove. Since many of these results are mirrored in other polyion-counterion systems, free-solution electrophoresis can be viewed as a reporter of the electrostatics and hydrodynamics of highly charged polyions. New results describing the mobilities of dsDNA analogues of a microRNA-messenger RNA complex are also presented.
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5
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Sitar S, Aseyev V, Žagar E, Kogej K. Chain dynamics and intermolecular association in dilute aqueous solutions of isotactic and atactic Poly(Methacrylic acid): Effect of NaCl concentration. POLYMER 2019. [DOI: 10.1016/j.polymer.2019.04.044] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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6
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Chen K, Zheng K, Xu G, Yang J, Zhao J. Diffusive Motion of Single Polyelectrolyte Molecules under Electrostatic Repulsion. Macromolecules 2019. [DOI: 10.1021/acs.macromol.9b00025] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kuo Chen
- Beijing National Research Center for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Kaikai Zheng
- Beijing National Research Center for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Guofeng Xu
- Beijing National Research Center for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jingfa Yang
- Beijing National Research Center for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jiang Zhao
- Beijing National Research Center for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
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7
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Jia D, Muthukumar M. Effect of Salt on the Ordinary-Extraordinary Transition in Solutions of Charged Macromolecules. J Am Chem Soc 2019; 141:5886-5896. [PMID: 30896938 DOI: 10.1021/jacs.9b00562] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Using dynamic light scattering technique, we address the role of added salt at higher concentrations on the "ordinary-extraordinary" transition in solutions of charged macromolecules. The "ordinary" behavior has previously been associated with a "fast" diffusion coefficient which is independent of salt concentration Cs and polymer concentration Cp if the ratio Cp/ Cs is above a threshold value. The "extraordinary" transition is associated with formation of aggregates, with a "slow" diffusion coefficient, formed from similarly charged macromolecules. By investigating aqueous solutions of sodium poly(styrenesulfonate) and sodium chloride with variations in Cp, Cs, and polymer molecular weight, Mw, we report the emergence of a new diffusive "fast" relaxation mode at higher values of Cp, Cs, and Mw, in addition to the previously known "fast" and "slow" relaxation modes. Furthermore, we find that Mw plays a crucial role on the collective dynamics of polyelectrolyte solutions with salt, instead of just the Cp/ Cs ratio as previously postulated. As Mw is progressively decreased, the salty solution exhibits dynamical transitions from three modes to two modes and then to one mode of relaxation. The emergence of the new fast mode and the dynamical transitions are in marked departure from the general premise of the ordinary-extraordinary transition developed over several decades. In an effort to rationalize our experimental findings we present a theory for the collective dynamics of polyelectrolyte solutions with salt by addressing the coupling between the relaxations of polyelectrolyte chains, counterions from the polymer and added salt, and co-ions from the salt. The predictions are in qualitative agreement with experimental findings. The present combined work of experiments and theory forms the basis for accurately characterizing dynamics of charged macromolecules in salty solutions, which are ubiquitous in biological systems and polyelectrolyte-based technologies.
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Affiliation(s)
- Di Jia
- Department of Polymer Science and Engineering , University of Massachusetts , Amherst , Massachusetts 01003 , United States
| | - Murugappan Muthukumar
- Department of Polymer Science and Engineering , University of Massachusetts , Amherst , Massachusetts 01003 , United States
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8
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Impact of module geometry on the ultrafiltration behavior of capsular polysaccharides for vaccines. J Memb Sci 2018. [DOI: 10.1016/j.memsci.2018.05.024] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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9
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Challenges in Predicting Protein-Protein Interactions from Measurements of Molecular Diffusivity. Biophys J 2017; 111:1831-1842. [PMID: 27806265 DOI: 10.1016/j.bpj.2016.09.018] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2016] [Revised: 08/26/2016] [Accepted: 09/14/2016] [Indexed: 01/11/2023] Open
Abstract
Dynamic light scattering can be used to measure the diffusivity of a protein within a formulation. The dependence of molecular diffusivity on protein concentration (traditionally expressed in terms of the interaction parameter kD) is often used to infer whether protein-protein interactions are repulsive or attractive, resulting in solutions that are colloidally stable or unstable, respectively. However, a number of factors unrelated to intermolecular forces can also impact protein diffusion, complicating this interpretation. Here, we investigate the influence of multicomponent diffusion in a ternary protein-salt-water system on protein diffusion and kD in the context of Nernst-Planck theory. This analysis demonstrates that large changes in protein diffusivity with protein concentration can result even for hard-sphere systems in the absence of protein-protein interactions. In addition, we show that dynamic light scattering measurements of diffusivity made at low ionic strength cannot be reliably used to detect protein conformational changes. We recommend comparing experimentally determined kD values to theoretically predicted excluded-volume contributions, which will allow a more accurate assessment of protein-protein interactions.
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10
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Barroso da Silva FL, MacKernan D. Benchmarking a Fast Proton Titration Scheme in Implicit Solvent for Biomolecular Simulations. J Chem Theory Comput 2017; 13:2915-2929. [DOI: 10.1021/acs.jctc.6b01114] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Fernando Luís Barroso da Silva
- Departamento
de Fı́sica e Quı́mica, Faculdade
de Ciências Farmacêuticas de Ribeirão Preto,
Av. do café, s/no. − Universidade de São Paulo, BR-14040-903 Ribeirão Preto, São Paulo, Brazil
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11
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12
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Ordinary-extraordinary transition in dynamics of solutions of charged macromolecules. Proc Natl Acad Sci U S A 2016; 113:12627-12632. [PMID: 27791143 DOI: 10.1073/pnas.1612249113] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The occurrence of the ubiquitous and intriguing "ordinary-extraordinary" behavior of dynamics in solutions of charged macromolecules is addressed theoretically by explicitly considering counterions around the macromolecules. The collective and coupled dynamics of macromolecules and their counterion clouds in salt-free conditions are shown to lead to the "ordinary" behavior (also called the "fast" mode) where diffusion coefficients are independent of molar mass and polymer concentration and are comparable to those of isolated metallic ions in aqueous media, in agreement with experimental facts observed repeatedly over the past four decades. The dipoles arising from adsorbed counterions on polymer backbones can form many pairwise physical cross-links, leading to microgel-like aggregates. Balancing the swelling from excluded volume effects and counterion pressure with elasticity of the microgel, we show that there is a threshold value of a combination of polymer concentration and electrolyte concentration for the occurrence of the "extraordinary" phase (also called the "slow" mode) and the predicted properties of diffusion coefficient for this phase are in qualitative agreement with well-known experimental data.
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13
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Sushko ML, Thomas DG, Pabit SA, Pollack L, Onufriev AV, Baker NA. The Role of Correlation and Solvation in Ion Interactions with B-DNA. Biophys J 2016; 110:315-326. [PMID: 26789755 DOI: 10.1016/j.bpj.2015.12.011] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2015] [Revised: 11/30/2015] [Accepted: 12/07/2015] [Indexed: 01/28/2023] Open
Abstract
The ionic atmospheres around nucleic acids play important roles in biological function. Large-scale explicit solvent simulations coupled to experimental assays such as anomalous small-angle x-ray scattering can provide important insights into the structure and energetics of such atmospheres but are time- and resource intensive. In this article, we use classical density functional theory to explore the balance among ion-DNA, ion-water, and ion-ion interactions in ionic atmospheres of RbCl, SrCl2, and CoHexCl3 (cobalt hexamine chloride) around a B-form DNA molecule. The accuracy of the classical density functional theory calculations was assessed by comparison between simulated and experimental anomalous small-angle x-ray scattering curves, demonstrating that an accurate model should take into account ion-ion correlation and ion hydration forces, DNA topology, and the discrete distribution of charges on the DNA backbone. As expected, these calculations revealed significant differences among monovalent, divalent, and trivalent cation distributions around DNA. Approximately half of the DNA-bound Rb(+) ions penetrate into the minor groove of the DNA and half adsorb on the DNA backbone. The fraction of cations in the minor groove decreases for the larger Sr(2+) ions and becomes zero for CoHex(3+) ions, which all adsorb on the DNA backbone. The distribution of CoHex(3+) ions is mainly determined by Coulomb and steric interactions, while ion-correlation forces play a central role in the monovalent Rb(+) distribution and a combination of ion-correlation and hydration forces affect the Sr(2+) distribution around DNA. This does not imply that correlations in CoHex solutions are weaker or stronger than for other ions. Steric inaccessibility of the grooves to large CoHex ions leads to their binding at the DNA surface. In this binding mode, first-order electrostatic interactions (Coulomb) dominate the overall binding energy as evidenced by low sensitivity of ionic distribution to the presence or absence of second-order electrostatic correlation interactions.
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Affiliation(s)
- Maria L Sushko
- Physical Sciences Division, Pacific Northwest National Laboratory, Richland, Washington
| | - Dennis G Thomas
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, Washington
| | - Suzette A Pabit
- School of Applied and Engineering Physics, Cornell University, Ithaca, New York
| | - Lois Pollack
- School of Applied and Engineering Physics, Cornell University, Ithaca, New York
| | - Alexey V Onufriev
- Department of Computer Science and Department of Physics, Virginia Tech, Blacksburg, Virginia
| | - Nathan A Baker
- Computational and Statistical Analytics Division, Pacific Northwest National Laboratory, Richland, Washington; Division of Applied Mathematics, Brown University, Providence, Rhode Island.
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14
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Černochová Z, Bogomolova A, Borisova OV, Filippov SK, Černoch P, Billon L, Borisov OV, Štěpánek P. Thermodynamics of the multi-stage self-assembly of pH-sensitive gradient copolymers in aqueous solutions. SOFT MATTER 2016; 12:6788-6798. [PMID: 27451979 DOI: 10.1039/c6sm01105e] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The self-assembly thermodynamics of pH-sensitive di-block and tri-block gradient copolymers of acrylic acid and styrene was studied for the first time using isothermal titration calorimetry (ITC) and dynamic light scattering (DLS) performed at varying pH. We were able to monitor each step of micellization as a function of decreasing pH. The growth of micelles is a multi-stage process that is pH dependent with several exothermic and endothermic components. The first step of protonation of the acrylic acid monomer units was accompanied mainly by conformational changes and the beginning of self-assembly. In the second stage of self-assembly, the micelles become larger and the number of micelles becomes smaller. While solution acidity increases, the isothermal calorimetry data show a broad deep minimum corresponding to an exothermic process attributed to an increase in the size of hydrophobic domains and an increase in the structure's hydrophobicity. The minor change in heat capacity (ΔCp) confirms the structural changes during this exothermic process. The exothermic process terminates deionization of acrylic acid. The pH-dependence of the ζ-potential of the block gradient copolymer micelles exhibits a plateau in the regime corresponding to the pH-controlled variation of the micellar dimensions. The onset of micelle formation and the solubility of the gradient copolymers were found to be dependent on the length of the gradient block.
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Affiliation(s)
- Zulfiya Černochová
- Institute of Macromolecular Chemistry AS CR, v.v.i., Heyrovského nám. 2, CZ-162 06 Praha 6, Czech Republic.
| | - Anna Bogomolova
- Institute of Macromolecular Chemistry AS CR, v.v.i., Heyrovského nám. 2, CZ-162 06 Praha 6, Czech Republic.
| | - Olga V Borisova
- UPPA, CNRS UMR 5254 IPREM Equipe de Physique et Chimie des Polymères, Pau, France
| | - Sergey K Filippov
- Institute of Macromolecular Chemistry AS CR, v.v.i., Heyrovského nám. 2, CZ-162 06 Praha 6, Czech Republic.
| | - Peter Černoch
- Institute of Macromolecular Chemistry AS CR, v.v.i., Heyrovského nám. 2, CZ-162 06 Praha 6, Czech Republic.
| | - Laurent Billon
- UPPA, CNRS UMR 5254 IPREM Equipe de Physique et Chimie des Polymères, Pau, France
| | - Oleg V Borisov
- UPPA, CNRS UMR 5254 IPREM Equipe de Physique et Chimie des Polymères, Pau, France and St.Petersburg National Research University of Information Technologies, Mechanics and Optics, 197101, St.Petersburg, Russia
| | - Petr Štěpánek
- Institute of Macromolecular Chemistry AS CR, v.v.i., Heyrovského nám. 2, CZ-162 06 Praha 6, Czech Republic.
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15
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Wang X, Li L. How does the anionic surfactant SDS affect the association of hydrophobically end-modified PNIPAM chains in aqueous solution? POLYMER 2016. [DOI: 10.1016/j.polymer.2016.02.034] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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16
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Stellwagen E, Stellwagen NC. Electrostatic Coupling between DNA and Its Counterions Modulates the Observed Translational Diffusion Coefficients. Anal Chem 2015. [DOI: 10.1021/acs.analchem.5b02230] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Earle Stellwagen
- Department of Biochemistry, University of Iowa, Iowa City, Iowa 52242, United States
| | - Nancy C. Stellwagen
- Department of Biochemistry, University of Iowa, Iowa City, Iowa 52242, United States
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17
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Cao Z, Wu S, Zhang G. Dynamics of single polyelectrolyte chains in salt-free dilute solutions investigated by analytical ultracentrifugation. Phys Chem Chem Phys 2015; 17:15896-902. [PMID: 26018174 DOI: 10.1039/c5cp02111a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The dynamics of polyelectrolytes in salt-free solution is an unsolved problem. We have investigated the sedimentation and diffusion of xanthan and poly(N-methyl 4-vinyl pyridine iodide) (P4VPI) in salt-free dilute solutions by analytical ultracentrifugation (AUC) using sedimentation velocity (SV) as a function of polyelectrolyte concentration (Cp). Our study reveals two concentration regimes distinguished in either polyanion (xanthan) or polycation (P4VPI) dilute aqueous solution. When Cp is below the Debye concentration (Cd) at which the chain separation (d) is close to the debye length (lD), the interchain electrostatic repulsion is negligible, and the reciprocal apparent sedimentation coefficient (1/s), apparent diffusion coefficient (D) or reciprocal apparent molecular weight (1/Mw) is linearly related to Cp. In the range Cp > Cd with d < lD, the interchain electrostatic repulsion is present, and the dynamics of polyelectrolytes becomes complex. The real sedimentation coefficient (s0), the diffusion coefficient (D0) and the molecular weight (Mw,0) of the single polyelectrolyte chain in salt-free dilute solution can be obtained by extrapolating the concentration to zero. The present study reveals that the complex dynamics of polyelectrolytes in salt-free dilute solutions arises due to the interchain electrostatic repulsion.
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Affiliation(s)
- Zhonglin Cao
- Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, 230026, China
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18
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Feldstein MM, Dormidontova EE, Khokhlov AR. Pressure sensitive adhesives based on interpolymer complexes. Prog Polym Sci 2015. [DOI: 10.1016/j.progpolymsci.2014.10.006] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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19
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Insight into dynamics of polyelectrolyte chains in salt-free solutions by laser light scattering and analytical ultracentrifugation. POLYMER 2014. [DOI: 10.1016/j.polymer.2014.10.046] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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20
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Zhu W, Zhang K, Chen Y. Block copolymer micelles as carriers of transition metal ions Y(III) and Cu(II) and gelation thereof. POLYMER 2014. [DOI: 10.1016/j.polymer.2014.10.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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21
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Sitar S, Aseyev V, Kogej K. Microgel-like aggregates of isotactic and atactic poly(methacrylic acid) chains in aqueous alkali chloride solutions as evidenced by light scattering. SOFT MATTER 2014; 10:7712-7722. [PMID: 25137480 DOI: 10.1039/c4sm01448k] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A comparative light-scattering study of isotactic and atactic poly(methacrylic acid), iPMA and aPMA, respectively, in aqueous solutions with added alkali chlorides, XCl (X = Li, Na, Cs), at 25 °C and XCl concentration of 0.1 mol L(-1), demonstrates that both PMA isomers are strongly associated at low degrees of neutralization, αN (= 0 for aPMA and 0.25 for iPMA), in the presence of all XCls. The shape parameter ρ and the scattering functions suggest that aggregates have the characteristics of microgel particles, with a dense core surrounded by a less dense shell. The extent of aggregation depends on the stereoregular structure of the polymer and on the type of the added cation. Li(+) and Na(+) ions support aggregation better than Cs(+) ions. Besides, iPMA chains are more strongly aggregated than aPMA chains and form particles with a denser core. A model of the aggregation process is suggested for iPMA. At high αN, a slow diffusive process (so-called extraordinary or anomalous mode in diffusion of polyelectrolytes), arising from electrostatic interactions between charged chains, is observed for both PMAs. Results suggest that under the same experimental conditions iPMA is effectively more charged than aPMA. The role of ions in the slow-mode phenomenon is less pronounced than in aggregation.
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Affiliation(s)
- Simona Sitar
- Department of Chemistry and Biochemistry, Faculty of Chemistry and Chemical Technology, University of Ljubljana, Aškerčeva 5, P.O. Box 537, SI-1001, Ljubljana, Slovenia.
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22
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Bogomolova A, Keller S, Klingler J, Sedlak M, Rak D, Sturcova A, Hruby M, Stepanek P, Filippov SK. Self-assembly thermodynamics of pH-responsive amino-acid-based polymers with a nonionic surfactant. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:11307-11318. [PMID: 25192406 DOI: 10.1021/la5031262] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The behavior of pH-responsive polymers poly(N-methacryloyl-l-valine) (P1), poly(N-methacryloyl-l-phenylalanine) (P2), and poly(N-methacryloylglycyne-l-leucine) (P3) has been studied in the presence of the nonionic surfactant Brij98. The pure polymers phase-separate in an acidic medium with critical pHtr values of 3.7, 5.5, and 3.4, respectively. The addition of the surfactant prevents phase separation and promotes reorganization of polymer molecules. The nature of the interaction between polymer and surfactant depends on the amino acid structure in the side chain of the polymer. This effect was investigated by dynamic light scattering, isothermal titration calorimetry, electrophoretic measurements, small-angle neutron scattering, and infrared spectroscopy. Thermodynamic analysis revealed an endothermic association reaction in P1/Brij98 mixture, whereas a strong exothermic effect was observed for P2/Brij98 and P3/Brij98. Application of regular solution theory for the analysis of experimental enthalpograms indicated dominant hydrophobic interactions between P1 and Brij98 and specific interactions for the P2/Brij98 system. Electrophoretic and dynamic light scattering measurements support the applicability of the theory to these cases. The specific interactions can be ascribed to hydrogen bonds formed between the carboxylic groups of the polymer and the oligo(ethylene oxide) head groups of the surfactant. Thus, differences in polymer-surfactant interactions between P1 and P2 polymers result in different structures of polymer-surfactant complexes. Specifically, small-angle neutron scattering revealed pearl-necklace complexes and "core-shell" structures for P1/Brij98 and P2/Brij98 systems, respectively. These results may help in the design of new pH-responsive site-specific micellar drug delivery systems or pH-responsive membrane-disrupting agents.
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Affiliation(s)
- Anna Bogomolova
- Institute of Macromolecular Chemistry AS CR, v.v.i, 162 06 Prague, Czech Republic
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23
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Subramanian D, Klauda JB, Collings PJ, Anisimov MA. Mesoscale Phenomena in Ternary Solutions of Tertiary Butyl Alcohol, Water, and Propylene Oxide. J Phys Chem B 2014; 118:5994-6006. [DOI: 10.1021/jp4125183] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | | | - Peter J. Collings
- Department
of Physics and Astronomy, Swarthmore College, Swarthmore, Pennsylvania 19081, United States
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24
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Okubo T. Microscopic Observation of Crystallites in the Deionized Suspensions of Monodispersed Polystyrene Spheres. ACTA ACUST UNITED AC 2014. [DOI: 10.1002/bbpc.198700003] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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25
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Angel M, Hoffmann H, Huber G, Rehage H. Electro-optic and Rheological Behaviour of Aqueous Dispersions of Polytetrafluorethylene (PTFE) Fibrilles. ACTA ACUST UNITED AC 2014. [DOI: 10.1002/bbpc.198800003] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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26
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Okubo T. Steady Flow Viscosity and Rigidity of Colloidal Spheres in Deionized Suspensions. ACTA ACUST UNITED AC 2014. [DOI: 10.1002/bbpc.198800116] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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27
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Sedlák M, Rak D. On the Origin of Mesoscale Structures in Aqueous Solutions of Tertiary Butyl Alcohol: The Mystery Resolved. J Phys Chem B 2014; 118:2726-37. [DOI: 10.1021/jp500953m] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Marián Sedlák
- Institute of Experimental
Physics, Slovak Academy of Sciences, Watsonova 47, 040
01 Košice, Slovakia
| | - Dmytro Rak
- Institute of Experimental
Physics, Slovak Academy of Sciences, Watsonova 47, 040
01 Košice, Slovakia
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28
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Sitar S, Aseyev V, Kogej K. Differences in association behavior of isotactic and atactic poly(methacrylic acid). POLYMER 2014. [DOI: 10.1016/j.polymer.2014.01.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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29
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Maeda H, Nakamura KI, Yamane H, Sasaki S, Kakehashi R. Counterion condensation and rapid transport of polyelectrolytes through aqueous polymer solutions. Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2012.08.072] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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30
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Saha S, Fischer K, Muthukumar M, Schmidt M. Apparent Molar Mass of a Polyelectrolyte in an Organic Solvent in the Low Ionic Strength Limit As Revealed by Light Scattering. Macromolecules 2013. [DOI: 10.1021/ma4006268] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- S. Saha
- Institute of Physical Chemistry, Jakob-Welder-Weg 11 55099 Mainz, Germany
| | - K. Fischer
- Institute of Physical Chemistry, Jakob-Welder-Weg 11 55099 Mainz, Germany
| | - M. Muthukumar
- Institute of Physical Chemistry, Jakob-Welder-Weg 11 55099 Mainz, Germany
| | - M. Schmidt
- Institute of Physical Chemistry, Jakob-Welder-Weg 11 55099 Mainz, Germany
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31
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Schurr JM. Phenomena Associated with Gel–Water Interfaces. Analyses and Alternatives to the Long-Range Ordered Water Hypothesis. J Phys Chem B 2013; 117:7653-74. [DOI: 10.1021/jp302589y] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- J. Michael Schurr
- Department
of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195-1700,
United States
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32
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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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33
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Sedlák M. Homopolymer self-assembly into stable nanoparticles: concerted action of hydrophobic association and hydrogen bonding in thermoresponsive poly(alkylacrylic acid)s. J Phys Chem B 2012; 116:2356-64. [PMID: 22280359 DOI: 10.1021/jp208445p] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A new approach to polymer self-assembly was presented recently [M. Sedlák, Č. Koňák, J. Dybal, Macromolecules 2009, 2, 7430-7438 and 7439-7446.] (1, 2) where stable polymeric nanoparticles were formed from poly(ethylacrylic acid) homopolymers without any assembly triggering additives, simply by heating polymer solution under conditions of thermosensitivity to certain temperature. In the current Article, we present successful results on poly(propylacrylic acid), which is a more hydrophobic polymer. We also present results on a less hydrophobic polymer from this series, poly(methacrylic acid), from which nanoparticles cannot be formed. Comparison of results on all three polymers gives a solid physicochemical insight and supports the molecular mechanism of the self-assembly previously suggested: The solvent quality gradually worsens upon heating of a thermosensitive polymer solution, and polymer-polymer contacts are preferred over polymer-solvent contacts, which leads to the formation of polymer assemblies. The presence of a significant amount of charge on chains prevents macroscopic phase separation. Upon subsequent cooling to laboratory temperature, the assemblies (nanoparticles) should eventually dissolve; however, this is not the case due to the fact that polymer chains brought to a close proximity at elevated temperatures become hydrogen-bonded. In addition, hydrogen bonds strengthen upon cooling. Mainly carboxylic-carboxylate hydrogen bonds (COOH····COO(-)) are responsible for the irreversibility of the process and the stability of nanoparticles. Conclusions are supported by results from static and dynamic light scattering, FTIR spectroscopy, and cryo-TEM microscopy. Size of nanoparticles can be monitored during the growth and custom-tailored by tuning critical parameters, especially the degree of ionization, temperature, and time of heating. Nanoparticles are stable over long periods of time. They are stable in a broad range of salt concentrations, including physiological conditions, and possess a mild acceptable degree of polydispersity.
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Affiliation(s)
- Marián Sedlák
- Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 040 01 Košice, Slovakia.
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34
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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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35
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Hoffmann I, Heunemann P, Prévost S, Schweins R, Wagner NJ, Gradzielski M. Self-aggregation of mixtures of oppositely charged polyelectrolytes and surfactants studied by rheology, dynamic light scattering and small-angle neutron scattering. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:4386-4396. [PMID: 21428323 DOI: 10.1021/la104588b] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
In this study, the phase behavior, structure and properties of systems composed of the cationic, cellulose-based polycation JR 400 and the anionic surfactants sodium dodecylbenzenesulfonate (SDBS) or sodium dodecylethoxysulfate (SDES), mainly in the semidilute regime, were examined. This system shows the interesting feature of a very large viscosity increase by nearly 4 orders of magnitude as compared to the pure polymer solution already at very low concentrations of 1 wt%. By using rheology, dynamic light scattering (DLS), and small-angle neutron scattering (SANS), we are able to deduce systematic correlations between the molecular composition of the systems (characterized by the charge ratio Z=[+(polymer)]/[−(surfactant)]), their structural organization and the resulting macroscopic flow behavior. Mixtures in the semidilute regime with an excess of polycation charge form highly viscous network structures containing rodlike aggregates composed of surfactant and polyelectrolyte that are interconnected by the long JR 400 chains. Viscosity and storage modulus follow scaling laws as a function of surfactant concentration (η~c(s)(4); G(0)~c(s)(1.5)) and the very pronounced viscosity increase mainly arises from the strongly enhanced structural relaxation time of the systems. In contrast, mixtures with excess surfactant charges form solutions with viscosities even below those of the pure polymer solution. The combination of SANS, DLS, and rheology shows that the structural, dynamical, and rheological properties of these oppositely charged polyelectrolyte/surfactant systems can be controlled in a systematic fashion by appropriately choosing the systems composition.
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Affiliation(s)
- Ingo Hoffmann
- Stranski Laboratorium für Physikalische und Theoretische Chemie, Technische Universität Berlin, Strasse des 17. Juni 124, 10623 Berlin, Germany.
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36
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Prelesnik S, Larin S, Aseyev V, Tenhu H, Kogej K. Water-Soluble Nonstoichiometric Complexes between Sodium Poly(styrenesulfonate) and Cetylpyridinium Chloride in Aqueous NaCl Solutions. A Static and Dynamic Light Scattering Study. J Phys Chem B 2011; 115:3793-803. [DOI: 10.1021/jp2008336] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Simona Prelesnik
- Department of Chemistry and Biochemistry, Faculty of Chemistry and Chemical Technology, University of Ljubljana, P.O. Box 537, SI-1000, Ljubljana, Slovenia
| | - Sergey Larin
- Laboratory of Polymer Chemistry, Department of Chemistry, University of Helsinki, P.O. Box 55, FIN-00014 HU, Helsinki, Finland
| | - Vladimir Aseyev
- Laboratory of Polymer Chemistry, Department of Chemistry, University of Helsinki, P.O. Box 55, FIN-00014 HU, Helsinki, Finland
| | - Heikki Tenhu
- Laboratory of Polymer Chemistry, Department of Chemistry, University of Helsinki, P.O. Box 55, FIN-00014 HU, Helsinki, Finland
| | - Ksenija Kogej
- Department of Chemistry and Biochemistry, Faculty of Chemistry and Chemical Technology, University of Ljubljana, P.O. Box 537, SI-1000, Ljubljana, Slovenia
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37
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Affiliation(s)
- Zhenli Luo
- Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, P. R. China 230026
| | - Guangzhao Zhang
- Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, P. R. China 230026
- Faculty of Materials Science and Engineering, South China University of Technology, Guangzhou, P. R. China 510640
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38
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Teixeira AAR, Lund M, Barroso da Silva FL. Fast Proton Titration Scheme for Multiscale Modeling of Protein Solutions. J Chem Theory Comput 2010; 6:3259-66. [DOI: 10.1021/ct1003093] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Andre Azevedo Reis Teixeira
- Department of Physics and Chemistry, 14040-903 Av. do café, s/no., FCFRP—USP, Ribeirão Preto, SP, Brazil, Department of Theoretical Chemistry Chemical Center, Lund University, P.O. Box 124-S-221 00, Lund, Sweden, and Department of Physics and Chemistry, 14040-903 Av. do café, s/no., FCFRP—USP, Ribeirão Preto, SP, Brazil
| | - Mikael Lund
- Department of Physics and Chemistry, 14040-903 Av. do café, s/no., FCFRP—USP, Ribeirão Preto, SP, Brazil, Department of Theoretical Chemistry Chemical Center, Lund University, P.O. Box 124-S-221 00, Lund, Sweden, and Department of Physics and Chemistry, 14040-903 Av. do café, s/no., FCFRP—USP, Ribeirão Preto, SP, Brazil
| | - Fernando Luís Barroso da Silva
- Department of Physics and Chemistry, 14040-903 Av. do café, s/no., FCFRP—USP, Ribeirão Preto, SP, Brazil, Department of Theoretical Chemistry Chemical Center, Lund University, P.O. Box 124-S-221 00, Lund, Sweden, and Department of Physics and Chemistry, 14040-903 Av. do café, s/no., FCFRP—USP, Ribeirão Preto, SP, Brazil
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39
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40
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Hoffmann H, Platz G, Rehage H, Schorr W. The Influence of Counter-Ion Concentration on the Aggregation Behaviour of Viscoelastic Detergents. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19810851012] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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41
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42
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Drifford M, Dalbiez JP, Delsanti M, Belloni L. Structure and dynamics of polyelectrolyte solutions with multivalent salts. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19961000624] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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43
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Topp A, Belkoura L, Woermann D. Dynamic Light Scattering Experiments with Aqueous Solutions of Polyelectrolytes of Low Charge Density Along the Polymer Chain in the Presence of Salt. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19950990506] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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44
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Zhang Y, Li S, Zhang L. Aggregation Behavior of Triple Helical Polysaccharide with Low Molecular Weight in Diluted Aqueous Solution. J Phys Chem B 2010; 114:4945-54. [DOI: 10.1021/jp9100398] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yangyang Zhang
- Department of Chemistry, Wuhan University, Wuhan 430072, China
| | - Sheng Li
- Department of Chemistry, Wuhan University, Wuhan 430072, China
| | - Lina Zhang
- Department of Chemistry, Wuhan University, Wuhan 430072, China
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45
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Kurakazu M, Katashima T, Chijiishi M, Nishi K, Akagi Y, Matsunaga T, Shibayama M, Chung UI, Sakai T. Evaluation of Gelation Kinetics of Tetra-PEG Gel. Macromolecules 2010. [DOI: 10.1021/ma100176f] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Manami Kurakazu
- Department of Bioengineering, Graduate School of Engineering
| | | | | | - Kengo Nishi
- Department of Bioengineering, Graduate School of Engineering
| | - Yuki Akagi
- Department of Bioengineering, Graduate School of Engineering
| | - Takuro Matsunaga
- The Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, 277-8581, Japan
| | - Mitsuhiro Shibayama
- The Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, 277-8581, Japan
| | - Ung-il Chung
- Department of Bioengineering, Graduate School of Engineering
| | - Takamasa Sakai
- Department of Bioengineering, Graduate School of Engineering
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46
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Deng L, Wang C, Li ZC, Liang D. Re-examination of the “Zipper Effect” in Hydrogen-Bonding Complexes. Macromolecules 2010. [DOI: 10.1021/ma902601d] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Lin Deng
- Beijing National Laboratory for Molecular Sciences and the Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China
| | - Chunhao Wang
- Beijing National Laboratory for Molecular Sciences and the Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China
| | - Zi-Chen Li
- Beijing National Laboratory for Molecular Sciences and the Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China
| | - Dehai Liang
- Beijing National Laboratory for Molecular Sciences and the Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China
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47
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Sedlák M, Koňák Č. A New Approach to Polymer Self-assembly into Stable Nanoparticles: Poly(ethylacrylic acid) Homopolymers. Macromolecules 2009. [DOI: 10.1021/ma9015032] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Marián Sedlák
- Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 040 01 Košice, Slovakia
| | - Čestmír Koňák
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovsky Sq. 2, 162 06 Prague 6, Czech Republic
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48
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Zhou K, Li J, Lu Y, Zhang G, Xie Z, Wu C. Re-examination of Dynamics of Polyeletrolytes in Salt-Free Dilute Solutions by Designing and Using a Novel Neutral−Charged−Neutral Reversible Polymer. Macromolecules 2009. [DOI: 10.1021/ma900541x] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kejin Zhou
- Shanghai-Hong Kong Joint Laboratory in Chemical Synthesis, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Lu, Shanghai 200032, China
| | - Junfang Li
- The Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, China
| | - Yijie Lu
- The Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, China
| | - Guangzhao Zhang
- The Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, China
| | - Zuowei Xie
- Shanghai-Hong Kong Joint Laboratory in Chemical Synthesis, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Lu, Shanghai 200032, China
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
| | - Chi Wu
- The Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, China
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
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49
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de Carvalho SJ, Fenley MO, da Silva FLB. Protein-ion binding process on finite macromolecular concentration. A Poisson-Boltzmann and Monte Carlo study. J Phys Chem B 2009; 112:16766-76. [PMID: 19368030 DOI: 10.1021/jp800783x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Electrostatic interactions are one of the key driving forces for protein-ligands complexation. Different levels for the theoretical modeling of such processes are available on the literature. Most of the studies on the Molecular Biology field are performed within numerical solutions of the Poisson-Boltzmann Equation and the dielectric continuum models framework. In such dielectric continuum models, there are two pivotal questions: (a) how the protein dielectric medium should be modeled, and (b) what protocol should be used when solving this effective Hamiltonian. By means of Monte Carlo (MC) and Poisson-Boltzmann (PB) calculations, we define the applicability of the PB approach with linear and nonlinear responses for macromolecular electrostatic interactions in electrolyte solution, revealing some physical mechanisms and limitations behind it especially due the raise of both macromolecular charge and concentration out of the strong coupling regime. A discrepancy between PB and MC for binding constant shifts is shown and explained in terms of the manner PB approximates the excess chemical potentials of the ligand, and not as a consequence of the nonlinear thermal treatment and/or explicit ion-ion interactions as it could be argued. Our findings also show that the nonlinear PB predictions with a low dielectric response well reproduce the pK shifts calculations carried out with an uniform dielectric model. This confirms and completes previous results obtained by both MC and linear PB calculations.
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Affiliation(s)
- Sidney Jurado de Carvalho
- Department of Physics, IBILCE/Unesp, 15054-000 - Rua Cristovão Colombo, 2265, Jd. Nazareth, São José do Rio Preto - SP, Brazil
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50
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Schmitz KS. Macroion Clustering in Solutions and Suspensions: The Roles of Microions and Solvent. J Phys Chem B 2009; 113:2624-38. [DOI: 10.1021/jp805648a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kenneth S. Schmitz
- Department of Chemistry, University of Missouri - Kansas City, Kansas City, Missouri, 64110
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