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Bai H, Chen D, Zhu H, Zhang S, Wang W, Ma P, Dong W. Photo-crosslinking ionic conductive PVA-SbQ/FeCl3 hydrogel sensors. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129205] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Fengler C, Keller J, Ratzsch K, Wilhelm M. In Situ RheoNMR Correlation of Polymer Segmental Mobility with Mechanical Properties during Hydrogel Synthesis. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2104231. [PMID: 35112813 PMCID: PMC8811812 DOI: 10.1002/advs.202104231] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2021] [Revised: 11/05/2021] [Indexed: 05/23/2023]
Abstract
Understanding polymer gelation over multiple length-scales is crucial to develop advanced materials. An experimental setup is developed that combines rheological measurements with simultaneous time-domain 1 H NMR relaxometry (TD-NMR) techniques, which are used to study molecular motion (<10 nm) in soft matter. This so-called low-field RheoNMR setup is used to study the impact of varying degrees of crosslinking (DC) on the gelation kinetics of acrylic acid (AAc) and N,N'-methylene bisacrylamide (MBA) free radical crosslinking copolymerization. A stretched exponential function describes the T2 relaxation curves throughout the gelation process. The stretching exponent β decreases from 0.90 to 0.67 as a function of increasing DC, suggesting an increase in network heterogeneity with a broad T2 distribution at higher DC. The inverse correlation of the elastic modulus G' with T2 relaxation times reveals a pronounced molecular rigidity for higher DC at early gelation times, indicating the formation of inelastic, rigid domains such as crosslinking clusters. The authors further correlate G' with the polymer concentration during gelation using a T1 filter for solvent suppression. A characteristic scaling exponent of 2.3 is found, which is in agreement with theoretical predictions of G' based on the confining tube model in semi-dilute entangled polymer solutions.
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Affiliation(s)
- Christian Fengler
- Institute for Chemical Technology and Polymer ChemistryKarlsruhe Institute of Technology (KIT)Karlsruhe76131Germany
| | - Jonas Keller
- Institute for Chemical Technology and Polymer ChemistryKarlsruhe Institute of Technology (KIT)Karlsruhe76131Germany
| | | | - Manfred Wilhelm
- Institute for Chemical Technology and Polymer ChemistryKarlsruhe Institute of Technology (KIT)Karlsruhe76131Germany
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Zhang N, Wang Y, Zhang J, Guo J, He J. Controlled domain gels with a biomimetic gradient environment for osteochondral tissue regeneration. Acta Biomater 2021; 135:304-317. [PMID: 34454084 DOI: 10.1016/j.actbio.2021.08.029] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Revised: 08/06/2021] [Accepted: 08/19/2021] [Indexed: 12/17/2022]
Abstract
In order to repair an osteochondral defect, it is critical to advance a bi-lineage constructive scaffold with gradient transition. In this study, we developed a simple and straightforward approach for fabricating a multi-domain gel scaffold through the assembly/disassembly of low-molecular-weight gels (LMWGs) inside a stable PEGDA network by photopolymerization. The versatility of this technology enabled to vary biological, topological, and mechanical properties through material selection and to generate a chondrogenic-osteogenic gradient transition. The multi-domain gel exhibited an increasing stiffness gradient along the longitudinal direction from the cartilage layer at approximately 20 kPa to the bone layer at approximately 300 kPa as well as spatial variation at the gradient interface. Moreover, the transitional layer with a condensed structure and intermediate stiffness prevented delamination of the contrasting layers and maintained microenvironmental differences in the upper and lower layers. The in vitro results indicated that each domain had an individual capacity to spatially control the differentiation of MSCs toward osteoblastic lineage and chondrocytic lineage. This was mainly because the mechanical and topographical cues from the respective domains played an important role in modulating the Rho-ROCK signaling pathway, whereas the blockage of ROCK signals significantly impaired domain-modulated osteogenesis and enhanced chondrogenesis. Additionally, the quantity and quality of osteochondral repair were evaluated at 4 and 8 weeks through histological analysis and micro-computed tomography (micro-CT). The results indicated that the multi-domain gels distinctly improved the regeneration of subchondral bone and cartilage tissues. Overall, the outcomes of this study can motivate future bioinspired gradient and heterogeneity strategies for osteochondral tissue regeneration. STATEMENT OF SIGNIFICANCE: The regeneration of osteochondral defects remains a major challenge due to the complexity of osteochondral structure and the limited self-repair capacity of cartilage. The gradient design to mimic the transition between the calcified cartilage and the subchondral bone plate as well as the zones of cartilage is an effective strategy. In this study, controlled multi-domain gels were fabricated through the assembly/disassembly of low-molecular-weight gels inside a stable PEGDA network by photopolymerization. The prepared multi-domain gels showed a chondrogenic-osteogenic gradient transition, which decreased the possibility of delamination and stimulated osteochondral tissue regeneration in vivo. Overall, our study promotes new strategies of bioinspired gradients and heterogeneities for more challenging applications.
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Velasco-Rodriguez B, Diaz-Vidal T, Rosales-Rivera LC, García-González CA, Alvarez-Lorenzo C, Al-Modlej A, Domínguez-Arca V, Prieto G, Barbosa S, Soltero Martínez JFA, Taboada P. Hybrid Methacrylated Gelatin and Hyaluronic Acid Hydrogel Scaffolds. Preparation and Systematic Characterization for Prospective Tissue Engineering Applications. Int J Mol Sci 2021; 22:ijms22136758. [PMID: 34201769 PMCID: PMC8268476 DOI: 10.3390/ijms22136758] [Citation(s) in RCA: 47] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2021] [Revised: 06/17/2021] [Accepted: 06/19/2021] [Indexed: 02/06/2023] Open
Abstract
Hyaluronic acid (HA) and gelatin (Gel) are major components of the extracellular matrix of different tissues, and thus are largely appealing for the construction of hybrid hydrogels to combine the favorable characteristics of each biopolymer, such as the gel adhesiveness of Gel and the better mechanical strength of HA, respectively. However, despite previous studies conducted so far, the relationship between composition and scaffold structure and physico-chemical properties has not been completely and systematically established. In this work, pure and hybrid hydrogels of methacroyl-modified HA (HAMA) and Gel (GelMA) were prepared by UV photopolymerization and an extensive characterization was done to elucidate such correlations. Methacrylation degrees of ca. 40% and 11% for GelMA and HAMA, respectively, were obtained, which allows to improve the hydrogels’ mechanical properties. Hybrid GelMA/HAMA hydrogels were stiffer, with elastic modulus up to ca. 30 kPa, and porous (up to 91%) compared with pure GelMA ones at similar GelMA concentrations thanks to the interaction between HAMA and GelMA chains in the polymeric matrix. The progressive presence of HAMA gave rise to scaffolds with more disorganized, stiffer, and less porous structures owing to the net increase of mass in the hydrogel compositions. HAMA also made hybrid hydrogels more swellable and resistant to collagenase biodegradation. Hence, the suitable choice of polymeric composition allows to regulate the hydrogels´ physical properties to look for the most optimal characteristics required for the intended tissue engineering application.
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Affiliation(s)
- B. Velasco-Rodriguez
- Department of Chemical Engineering, CUCEI, Universidad de Guadalajara, Guadalajara 44430, Mexico; (B.V.-R.); (T.D.-V.); (L.C.R.-R.)
- Colloids and Polymers Physics Group, Department of Particle Physics, Faculty of Physics and Health Research Institute of Santiago de Compostela (IDIS), Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain;
| | - T. Diaz-Vidal
- Department of Chemical Engineering, CUCEI, Universidad de Guadalajara, Guadalajara 44430, Mexico; (B.V.-R.); (T.D.-V.); (L.C.R.-R.)
| | - L. C. Rosales-Rivera
- Department of Chemical Engineering, CUCEI, Universidad de Guadalajara, Guadalajara 44430, Mexico; (B.V.-R.); (T.D.-V.); (L.C.R.-R.)
| | - C. A. García-González
- Department of Pharmacology, Pharmacy and Pharmaceutical Technology, I + D Farma Group (GI-1645), Faculty of Pharmacy and Health Research Institute of Santiago de Compostela (IDIS), Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain; (C.A.G.-G.); (C.A.-L.)
| | - C. Alvarez-Lorenzo
- Department of Pharmacology, Pharmacy and Pharmaceutical Technology, I + D Farma Group (GI-1645), Faculty of Pharmacy and Health Research Institute of Santiago de Compostela (IDIS), Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain; (C.A.G.-G.); (C.A.-L.)
| | - A. Al-Modlej
- Department of Physics and Astronomy, College of Science, King Saud University, Riyadh 11451, Saudi Arabia;
| | - V. Domínguez-Arca
- Biophysics and Interfaces Group, Department of Applied Physics, Faculty of Physics, Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain; (V.D.-A.); (G.P.)
| | - G. Prieto
- Biophysics and Interfaces Group, Department of Applied Physics, Faculty of Physics, Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain; (V.D.-A.); (G.P.)
| | - S. Barbosa
- Colloids and Polymers Physics Group, Department of Particle Physics, Faculty of Physics and Health Research Institute of Santiago de Compostela (IDIS), Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain;
| | - J. F. A. Soltero Martínez
- Department of Chemical Engineering, CUCEI, Universidad de Guadalajara, Guadalajara 44430, Mexico; (B.V.-R.); (T.D.-V.); (L.C.R.-R.)
- Correspondence: (J.F.A.S.M.); (P.T.)
| | - P. Taboada
- Colloids and Polymers Physics Group, Department of Particle Physics, Faculty of Physics and Health Research Institute of Santiago de Compostela (IDIS), Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain;
- Correspondence: (J.F.A.S.M.); (P.T.)
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Comparative gelation of acrylic acid and acrylamide in diacrylate and dimethacrylate crosslinked matrices. Polym Bull (Berl) 2021. [DOI: 10.1007/s00289-020-03147-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Magami SM, Williams RL. Gelation via cationic chelation/crosslinking of acrylic‐acid‐based polymers. POLYM INT 2019. [DOI: 10.1002/pi.5910] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Saminu M Magami
- School Of Engineering And The Built Environment, Material Chemistry and Processing Unit, School of Engineering and the Built EnvironmentEdinburgh Napier University Edinburgh UK
| | - Rhodri L Williams
- Institute for Multiscale Thermofluids, School of EngineeringUniversity of Edinburgh Edinburgh Scotland UK
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Magami SM, Williams RL. Roles of the molecular weight of n
-ethylene glycol diacrylates and UV irradiance on the mechanical properties at the gel point of acrylic acid based hydrogels. J Appl Polym Sci 2019. [DOI: 10.1002/app.47606] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Saminu M. Magami
- Polymer and Materials Group, School of Engineering and the Built Environment; Edinburgh Napier University; Edinburgh United Kingdom
| | - Rhodri L. Williams
- Polymer and Materials Group, School of Engineering and the Built Environment; Edinburgh Napier University; Edinburgh United Kingdom
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