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Fischer T, Demco DE, Fechete R, Möller M, Singh S. Poly(vinylamine-co-N-isopropylacrylamide) linear polymer and hydrogels with tuned thermoresponsivity. SOFT MATTER 2020; 16:6549-6562. [PMID: 32617537 DOI: 10.1039/d0sm00408a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The fabrication of functional hydrogels with tuned thermoresponsivity is a major challenge. To meet this challenge we copolymerize N-isopropylacrylamide (NIPAm) with N-vinylformamide (NVF) in different ratios with the formamide group being subsequently selectively hydrolyzed to the corresponding amine (VAm). The copolymers are crosslinked with phenylcarbonate telechelic glycol. The influence of the NIPAm : VAm ratio on the thermoresponsitiviy is investigated in terms of absorbance, rheology, NMR spectroscopy, relaxometry, and diffusometry. Phase transition temperatures, change in the entropy of the polymer-water system, and width of the transition in the process of coil-to-globule and swollen-to-collapsed network transitions were evaluated by a two state model and Boltzmann sigmoidal function.
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Affiliation(s)
- Thorsten Fischer
- DWI-Leibniz-Institute for Interactive Materials, e.V., RWTH Aachen University, Forckenbeckstraße 50, D-52074 Aachen, Germany.
| | - Dan E Demco
- DWI-Leibniz-Institute for Interactive Materials, e.V., RWTH Aachen University, Forckenbeckstraße 50, D-52074 Aachen, Germany. and Technical University of Cluj-Napoca, Department of Physics and Chemistry, 25 G. Baritiu Str., RO-400027, Cluj-Napoca, Romania
| | - Radu Fechete
- Technical University of Cluj-Napoca, Department of Physics and Chemistry, 25 G. Baritiu Str., RO-400027, Cluj-Napoca, Romania
| | - Martin Möller
- DWI-Leibniz-Institute for Interactive Materials, e.V., RWTH Aachen University, Forckenbeckstraße 50, D-52074 Aachen, Germany.
| | - Smriti Singh
- DWI-Leibniz-Institute for Interactive Materials, e.V., RWTH Aachen University, Forckenbeckstraße 50, D-52074 Aachen, Germany.
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Glucose-induced structural changes and anomalous diffusion of elastin. Colloids Surf B Biointerfaces 2020; 188:110776. [PMID: 31945631 DOI: 10.1016/j.colsurfb.2020.110776] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Revised: 12/18/2019] [Accepted: 01/04/2020] [Indexed: 01/31/2023]
Abstract
Elastin is the principal protein component of elastic fiber, which renders essential elasticity to connective tissues and organs. Here, we adopted a multi-technique approach to study the transport, viscoelastic, and structural properties of elastin exposed to various glucose concentrations (X=[gluc]/[elastin]). Laser light scattering experiments revealed an anomalous behavior (anomaly exponent, β <0.6) of elastin. In this regime (β <0.6), the diffusion constant decreases by 40% in the presence of glucose (X> 10), which suggests the structural change in elastin. We have observed a peculiar inverse temperature transition of elastin protein, which is a measure of structural change, at 40 °C through rheology experiments. Moreover, we observe its shift towards lower temperature with a higher X. FTIR revealed that the presence of glucose (X < 10) favors the formation of β-sheet structure in elastin. However, for X > 10, dominative crowding effect reduces the mobility of protein and favors the increase in β-turns and γ-turns by 25 ± 1% over the β-sheet (β-sheet decreases by 12 ± 0.8%) and α-helix (α-helix decreases by 13 ± 0.8%). The stiffness of protein is estimated through Flory characteristic ratio, C∞ and found to be increasing with X. These glucose-based structural changes in the elastin may explain the role of glucose in age-related issues of the skin.
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Morales MA, Paiva WA, Marvin L, Balog ERM, Halpern JM. Electrochemical characterization of the stimuli-response of surface-immobilized elastin-like polymers. SOFT MATTER 2019; 15:9640-9646. [PMID: 31670364 DOI: 10.1039/c9sm01681c] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Elastin-like polymers (ELPs) are frequently used in a variety of bioengineering applications because of their stimuli-responsive properties. Above their transition temperature, ELPs will adopt different structures that promote intra- and intermolecular hydrophobic contacts to minimize unfavorable interactions with an aqueous environment. We electrochemically characterize the stimuli-responsive behavior of surface-immobilized ELPs corresponding to two proposed states: extended and collapsed. In the extended state the ELPs are more solvated. In the collapsed state, triggered by introducing an environmental stimulus, non-polar intramolecular contacts within ELPs are favored, resulting in quantifiable morphological changes on the surface characterized using electrochemical impedance spectroscopy (EIS). Charge transfer resistance, a component of impedance, was shown to increase after exposing an ELP modified electrode to a high salt concentration environment (3.0 M NaCl). An increase in charge transfer resistance indicates an increase in the insulating layer on the electrode surface consistent with the proposed mechanism of collapse, as the ELPs have undergone morphological changes to hinder the kinetics of the redox couple exchange. Further characterization of the surface-immobilized ELPs showed a reproducible surface modification, as well as reversibility and tunability of the stimuli-response.
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Affiliation(s)
- Marissa A Morales
- Department of Chemical Engineering, University of New Hampshire, Durham, NH, USA.
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Ibáñez-Fonseca A, Flora T, Acosta S, Rodríguez-Cabello JC. Trends in the design and use of elastin-like recombinamers as biomaterials. Matrix Biol 2019; 84:111-126. [PMID: 31288085 DOI: 10.1016/j.matbio.2019.07.003] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Revised: 06/23/2019] [Accepted: 07/05/2019] [Indexed: 12/16/2022]
Abstract
Elastin-like recombinamers (ELRs), which derive from one of the repetitive domains found in natural elastin, have been intensively studied in the last few years from several points of view. In this mini review, we discuss all the recent works related to the investigation of ELRs, starting with those that define these polypeptides as model intrinsically disordered proteins or regions (IDPs or IDRs) and its relevance for some biomedical applications. Furthermore, we summarize the current knowledge on the development of drug, vaccine and gene delivery systems based on ELRs, while also emphasizing the use of ELR-based hydrogels in tissue engineering and regenerative medicine (TERM). Finally, we show different studies that explore applications in other fields, and several examples that describe biomaterial blends in which ELRs have a key role. This review aims to give an overview of the recent advances regarding ELRs and to encourage further investigation of their properties and applications.
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Affiliation(s)
- Arturo Ibáñez-Fonseca
- BIOFORGE Lab, CIBER-BBN, University of Valladolid, Paseo de Belén 19, 47011 Valladolid, Spain
| | - Tatjana Flora
- BIOFORGE Lab, CIBER-BBN, University of Valladolid, Paseo de Belén 19, 47011 Valladolid, Spain
| | - Sergio Acosta
- BIOFORGE Lab, CIBER-BBN, University of Valladolid, Paseo de Belén 19, 47011 Valladolid, Spain
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Schweizerhof S, Demco DE, Mourran A, Fechete R, Möller M. Polymers Diffusivity Encoded by Stimuli‐Induced Phase Transition: Theory and Application to Poly(
N
‐Isopropylacrylamide) with Hydrophilic and Hydrophobic End Groups. MACROMOL CHEM PHYS 2018. [DOI: 10.1002/macp.201700587] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Sjören Schweizerhof
- DWI‐Leibniz‐Institute for Interactive Materials, e.V.RWTH‐Aachen University Forckenbeckstraße 50 D‐52074 Aachen Germany
| | - Dan Eugen Demco
- DWI‐Leibniz‐Institute for Interactive Materials, e.V.RWTH‐Aachen University Forckenbeckstraße 50 D‐52074 Aachen Germany
- Department of Physics and ChemistryTechnical University of Cluj‐Napoca 25 G. Baritiu Str. RO‐400027 Cluj‐Napoca Romania
| | - Ahmed Mourran
- DWI‐Leibniz‐Institute for Interactive Materials, e.V.RWTH‐Aachen University Forckenbeckstraße 50 D‐52074 Aachen Germany
| | - Radu Fechete
- Department of Physics and ChemistryTechnical University of Cluj‐Napoca 25 G. Baritiu Str. RO‐400027 Cluj‐Napoca Romania
| | - Martin Möller
- DWI‐Leibniz‐Institute for Interactive Materials, e.V.RWTH‐Aachen University Forckenbeckstraße 50 D‐52074 Aachen Germany
- Institute of Technical and Macromolecular ChemistryRWTH‐Aachen University Worringerweg 2 D‐52074 Aachen Germany
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Bahniuk MS, Alshememry AK, Elgersma SV, Unsworth LD. Self-assembly/disassembly hysteresis of nanoparticles composed of marginally soluble, short elastin-like polypeptides. J Nanobiotechnology 2018; 16:15. [PMID: 29454362 PMCID: PMC5816514 DOI: 10.1186/s12951-018-0342-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2017] [Accepted: 02/09/2018] [Indexed: 12/27/2022] Open
Abstract
BACKGROUND Elastin-like polypeptides (ELPs) are a fascinating biomaterial that has undergone copious development for a variety of therapeutic applications including as a nanoscale drug delivery vehicle. A comprehensive understanding of ELP self-assembly is lacking and this knowledge gap impedes the advancement of ELP-based biomaterials into the clinical realm. The systematic examination of leucine-containing ELPs endeavors to expand existing knowledge about fundamental assembly-disassembly behaviours. RESULTS It was observed that these marginally soluble, short ELPs tend to behave consistently with previous observations related to assembly-related ELP phase transitions but deviated in their disassembly. It was found that chain length, concentration and overall sequence hydrophobicity may influence the irreversible formation of sub-micron particles as well as the formation of multi-micron scale, colloidally unstable aggregates. Amino acid composition affected surface charge and packing density of the particles. Particle stability upon dilution was found to vary depending upon chain length and hydrophobicity, with particles composed of longer and/or more hydrophobic ELPs being more resistant to disassembly upon isothermal dilution. CONCLUSIONS Taken together, these results suggest marginally soluble ELPs may self-assemble but not disassemble as expected and that parameters including particle size, zeta potential and dilution resistance would benefit from widespread systematic evaluations. This information has the potential to reveal novel preparation methods capable of expanding the utility of all existing ELP-based biomaterials.
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Affiliation(s)
- Markian S Bahniuk
- Department of Biomedical Engineering, 1098 Research Transition Facility, University of Alberta, 8308-114 Street, Edmonton, AB, T6G 2V2, Canada
| | - Abdullah K Alshememry
- Faculty of Pharmacy and Pharmaceutical Sciences, 2-35B Medical Sciences Building, University of Alberta, Edmonton, AB, T6G 2H1, Canada.,Department of Pharmaceutics, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Scott V Elgersma
- Department of Chemical and Materials Engineering, University of Alberta, 12th Floor-Donadeo Innovation Centre for Engineering, 9211-116 Street, Edmonton, AB, T6G 1H9, Canada
| | - Larry D Unsworth
- Department of Biomedical Engineering, 1098 Research Transition Facility, University of Alberta, 8308-114 Street, Edmonton, AB, T6G 2V2, Canada. .,Department of Chemical and Materials Engineering, University of Alberta, 12th Floor-Donadeo Innovation Centre for Engineering, 9211-116 Street, Edmonton, AB, T6G 1H9, Canada.
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Schweizerhof S, Demco DE, Mourran A, Keul H, Fechete R, Möller M. Thermodynamic Parameters of Temperature-Induced Phase Transition for Brushes onto Nanoparticles: Hydrophilic versus Hydrophobic End-Groups Functionalization. Macromol Rapid Commun 2017; 38. [PMID: 28833862 DOI: 10.1002/marc.201700362] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2017] [Revised: 07/20/2017] [Indexed: 11/10/2022]
Abstract
Quantification of the stimuli-responsive phase transition in polymers is topical and important for the understanding and development of novel stimuli-responsive materials. The temperature-induced phase transition of poly(N-isopropylacrylamide) (PNIPAm) with one thiol end group depends on the confinement-free polymer or polymer brush-on the molecular weight and on the nature of the second end. This paper describes the synthesis of heterotelechelic PNIPAm of different molecular weights with a thiol end group-that specifically binds to gold nanorods and a hydrophilic NIPAm end group by reversible addition-fragmentation chain-transfer polymerization. Proton high-resolution magic angle sample spinning NMR spectra are used as an indicator of the polymer chain conformations. The characteristics of phase transition given by the transition temperature, entropy, and width of transition are obtained by a two-state model. The dependence of thermodynamic parameters on molecular weight is compared for hydrophilic and hydrophobic end functional-free polymers and brushes.
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Affiliation(s)
- Sjören Schweizerhof
- DWI-Leibniz-Institute for Interactive Materials, e.V., RWTH-Aachen University, Forckenbeckstraße 50, D-52074, Aachen, Germany
| | - Dan Eugen Demco
- DWI-Leibniz-Institute for Interactive Materials, e.V., RWTH-Aachen University, Forckenbeckstraße 50, D-52074, Aachen, Germany.,Department of Physics and Chemistry, Technical University of Cluj-Napoca, 25 G. Baritiu Str, RO-400027, Cluj-Napoca, Romania
| | - Ahmed Mourran
- DWI-Leibniz-Institute for Interactive Materials, e.V., RWTH-Aachen University, Forckenbeckstraße 50, D-52074, Aachen, Germany
| | - Helmut Keul
- DWI-Leibniz-Institute for Interactive Materials, e.V., RWTH-Aachen University, Forckenbeckstraße 50, D-52074, Aachen, Germany
| | - Radu Fechete
- Department of Physics and Chemistry, Technical University of Cluj-Napoca, 25 G. Baritiu Str, RO-400027, Cluj-Napoca, Romania
| | - Martin Möller
- DWI-Leibniz-Institute for Interactive Materials, e.V., RWTH-Aachen University, Forckenbeckstraße 50, D-52074, Aachen, Germany.,Institute for Technical and Macromolecular Chemistry, RWTH-Aachen University, Worringerweg 2, D-52074, Aachen, Germany
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Schweizerhof S, Demco DE, Mourran A, Keul H, Fechete R, Möller M. Temperature-Induced Phase Transition Characterization of Responsive Polymer Brushes Grafted onto Nanoparticles. MACROMOL CHEM PHYS 2017. [DOI: 10.1002/macp.201600495] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Sjören Schweizerhof
- DWI-Leibniz-Institute for Interactive Materials, e.V.; RWTH-Aachen University; Forckenbeckstraße 50 52074 Aachen Germany
| | - Dan Eugen Demco
- DWI-Leibniz-Institute for Interactive Materials, e.V.; RWTH-Aachen University; Forckenbeckstraße 50 52074 Aachen Germany
- Technical University of Cluj-Napoca; Department of Physics and Chemistry; 25 G. Baritiu Str. 400027 Cluj-Napoca Romania
| | - Ahmed Mourran
- DWI-Leibniz-Institute for Interactive Materials, e.V.; RWTH-Aachen University; Forckenbeckstraße 50 52074 Aachen Germany
| | - Helmut Keul
- DWI-Leibniz-Institute for Interactive Materials, e.V.; RWTH-Aachen University; Forckenbeckstraße 50 52074 Aachen Germany
| | - Radu Fechete
- Technical University of Cluj-Napoca; Department of Physics and Chemistry; 25 G. Baritiu Str. 400027 Cluj-Napoca Romania
| | - Martin Möller
- DWI-Leibniz-Institute for Interactive Materials, e.V.; RWTH-Aachen University; Forckenbeckstraße 50 52074 Aachen Germany
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