1
|
Samadian H, Maleki H, Allahyari Z, Jaymand M. Natural polymers-based light-induced hydrogels: Promising biomaterials for biomedical applications. Coord Chem Rev 2020. [DOI: 10.1016/j.ccr.2020.213432] [Citation(s) in RCA: 62] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
|
2
|
Development of Novel N-isopropylacrylamide (NIPAAm) Based Hydrogels with Varying Content of Chrysin Multiacrylate. Gels 2017; 3. [PMID: 29805968 PMCID: PMC5967267 DOI: 10.3390/gels3040040] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
A series of novel temperature responsive hydrogels were synthesized by free radical polymerization with varying content of chrysin multiacrylate (ChryMA). The goal was to study the impact of this novel polyphenolic-based multiacrylate on the properties of N-isopropylacrylamide (NIPAAm) hydrogels. The temperature responsive behavior of the copolymerized gels was characterized by swelling studies, and their lower critical solution temperature (LCST) was characterized through differential scanning calorimetry (DSC). It was shown that the incorporation of ChryMA decreased the swelling ratios of the hydrogels and shifted their LCSTs to a lower temperature. Gels with different ChryMA content showed different levels of response to temperature change. Higher content gels had a broader phase transition and smaller temperature response, which could be attributed to the increased hydrophobicity being introduced by the ChryMA.
Collapse
|
3
|
Tang S, Bhandari R, Delaney SP, Munson EJ, Dziubla TD, Hilt JZ. Synthesis and characterization of thermally responsive N-isopropylacrylamide hydrogels copolymerized with novel hydrophobic polyphenolic crosslinkers. MATERIALS TODAY. COMMUNICATIONS 2017; 10:46-53. [PMID: 28989952 PMCID: PMC5628756 DOI: 10.1016/j.mtcomm.2016.12.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Two series of thermosensitive hydrogels were synthesized by copolymerizing N-isopropylacrylamide (NIPAAm) with various contents of novel hydrophobic crosslinkers, curcumin multiacrylate (CMA) and quercetin multiacrylate (QMA). The compositions of the resulting hydrogels were characterized using solid state-NMR (ss-NMR), and the temperature dependent swelling behavior and lower critical solution temperature (LCST) were characterized using swelling studies and differential scanning calorimetry (DSC). Increasing the crosslinker content resulted in a significant decrease in the LCST and swelling ratio of hydrogels, which could be attributed to the increased hydrophobicity introduced by CMA or QMA. All of the hydrogels demonstrated temperature responsive swelling with the extent of swelling decreasing with increasing crosslinker content. The lower crosslinker content gels displayed sharper phase transitions, while the high crosslinker content gels had broader phase transitions.
Collapse
Affiliation(s)
- Shuo Tang
- Department of Chemical and Materials Engineering, University of Kentucky, Lexington, Kentucky 40506, USA
| | - Rohit Bhandari
- Department of Chemical and Materials Engineering, University of Kentucky, Lexington, Kentucky 40506, USA
| | - Sean P Delaney
- Department of Pharmaceutical Sciences, University of Kentucky, Lexington, Kentucky 40506, USA
| | - Eric J Munson
- Department of Pharmaceutical Sciences, University of Kentucky, Lexington, Kentucky 40506, USA
| | - Thomas D Dziubla
- Department of Chemical and Materials Engineering, University of Kentucky, Lexington, Kentucky 40506, USA
| | - J Zach Hilt
- Department of Chemical and Materials Engineering, University of Kentucky, Lexington, Kentucky 40506, USA
| |
Collapse
|
4
|
Bialik-Wąs K, Pielichowski K, Zielina M. Acrylic hydrogels containing MET-loaded poly(acrylic acid-co-methyl methacrylate) micro- and nanoparticles. JOURNAL OF POLYMER RESEARCH 2014. [DOI: 10.1007/s10965-014-0623-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
5
|
Peng K, Sun J, Wang Y, Li Y, Zhang B, Wang B. Synthesis, characterization, and in vitrobiocompatibility study of novel disulfide cross-linked hydrogels based on poly(amic acid). J Appl Polym Sci 2014. [DOI: 10.1002/app.40930] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Kun Peng
- Key Lab of Biorheological Science and Technology; Research Center of Bioinspired Material Science and Engineering, College of Bioengineering, Chongqing University; Chongqing 400030 China
- Department of Medical Technology; Chongqing Medical and Pharmaceutical College; Chongqing 401331 China
| | - Jiaoxia Sun
- Key Lab of Biorheological Science and Technology; Research Center of Bioinspired Material Science and Engineering, College of Bioengineering, Chongqing University; Chongqing 400030 China
- School of River and Ocean Engineering; Chongqing Jiaotong University; Chongqing 400074 China
| | - Yuanliang Wang
- Key Lab of Biorheological Science and Technology; Research Center of Bioinspired Material Science and Engineering, College of Bioengineering, Chongqing University; Chongqing 400030 China
| | - Yuxiao Li
- Key Lab of Biorheological Science and Technology; Research Center of Bioinspired Material Science and Engineering, College of Bioengineering, Chongqing University; Chongqing 400030 China
| | - Bingbing Zhang
- Key Lab of Biorheological Science and Technology; Research Center of Bioinspired Material Science and Engineering, College of Bioengineering, Chongqing University; Chongqing 400030 China
| | - Bin Wang
- Key Lab of Biorheological Science and Technology; Research Center of Bioinspired Material Science and Engineering, College of Bioengineering, Chongqing University; Chongqing 400030 China
| |
Collapse
|
6
|
Van Tomme SR, Hennink WE. Biodegradable dextran hydrogels for protein delivery applications. Expert Rev Med Devices 2014; 4:147-64. [PMID: 17359222 DOI: 10.1586/17434440.4.2.147] [Citation(s) in RCA: 184] [Impact Index Per Article: 18.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The rapid development of protein-based pharmaceuticals over recent decades has tremendously increased the need for suitable delivery systems, guaranteeing a safe and controlled delivery of proteinacious drugs. Hydrogels offer good opportunities as protein delivery systems or tissue engineering scaffolds owing to an inherent biocompatibility. Their hydrophilic, soft and rubbery nature ensures minimal tissue irritation and a low tendency of cells and proteins to adhere to the hydrogel surface. A variety of both natural and synthetic polymers have been used for the design of hydrogels, in which network formation is established by chemical or physical crosslinking. This review introduces the general features of hydrogels and focuses on dextran hydrogels in particular. Chemically and physically crosslinked systems are described and their potential suitability as protein delivery systems, as well as tissue engineering scaffolds are discussed. Special attention is given to network properties, protein delivery, degradation behavior and biocompatibility.
Collapse
Affiliation(s)
- Sophie R Van Tomme
- Department of Pharmaceutics, Utrecht Institute for Pharmaceutical Sciences, University of Utrecht, PO Box 80082, 3508 TB Utrecht, The Netherlands.
| | | |
Collapse
|
7
|
Galperin A, Long TJ, Garty S, Ratner BD. Synthesis and fabrication of a degradable poly(N-isopropyl acrylamide) scaffold for tissue engineering applications. J Biomed Mater Res A 2012; 101:775-86. [PMID: 22961921 DOI: 10.1002/jbm.a.34380] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2012] [Revised: 07/16/2012] [Accepted: 07/17/2012] [Indexed: 02/02/2023]
Abstract
Biodegradable poly(N-isopropyl acrylamide) (polyNIPAM) hydrogels with controlled molecular weight of the parent polymer and its degradation products were synthesized by atom transfer radical polymerization in the presence of a polycaprolactone-based di-chlorinated macroinitiator and polycaprolactone dimethacrylate. The phase transition temperature, swelling, hydrolytic degradability, and mechanical properties at 25 and 37°C were explored. A cytocompatibility study showed good NIH3T3 cell response over 5 days culture on the surface of the hydrogels, demonstrated by a consistent increase in cell proliferation detected by an Alamar Blue assay. MTT [3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide] results suggested that the hydrogels and their degradation products in the concentration range of 1-25 mg/mL were not cytotoxic to NIH3T3 cells. A sphere-templating technique was utilized to fabricate biodegradable polyNIPAM scaffolds with monodisperse, pore size. Scaffolds with pore diameter of 48 ± 6 μm were loaded with A-10 smooth muscle cells and then warmed to 37°C entrapping cells in pores approximately 40 μm in diameter, a size we have found to be optimal for angiogenesis and biointegration. Due to their degradable nature, tunable molecular weight, highly interconnected morphology, thermally controlled monodisperse pore size, and temperature-induced volume expansion-contraction, the polyNIPAM-based scaffolds developed in this work will be valuable in tissue engineering.
Collapse
Affiliation(s)
- Anna Galperin
- University of Washington, Department of Bioengineering, Seattle, Washington 98195, USA
| | | | | | | |
Collapse
|
8
|
Namkung S, Chu CC. Effect of solvent mixture on the properties of temperature- and pH-sensitive polysaccharide-based hydrogels. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2012; 17:519-46. [PMID: 16800153 DOI: 10.1163/156856206776986260] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Novel partially biodegradable, temperature- and pH-sensitive polysaccharide-based hydrogels (NDF) were synthesized from modified dextran (dextran-maleic acid, Dex-MA) and N-isopropylacrylamide precursors over a wide range of mixed solvent ratios of dimethyl formamide (DMF) to water. N-Isopropylacrylamide monomers were chosen to impart thermo-responsive capability to Dex-MA, while Dex-MA was chosen to impart pH-responsive capability to N-isopropylacrylamide. The pH-sensitive precursor (Dex-MA) was synthesized by reacting dextran with maleic anhydride in the presence of triethylamine catalyst. To fabricate multi-stimuli hybrid hydrogel networks, both Dex-MA and N-isopropylarylamide precursors were photo-cross-linked via UV at a fixed Dex-MA to N-isopropylarylamide feed ratio over a wide range of DMF to water mixed solvent ratios. The newly synthesized PNIPAAm/Dex-MA hybrid hydrogels (NDF) were characterized by Fourier transform infrared spectroscopy for chemical structure determination, differential scanning calorimetry for thermal analysis and scanning electron microscopy for morphological study. The properties of the hybrid hydrogels, such as thermo-induced deswelling, pH-sensitivity, ionic strength sensitivity and thermo-reversibility, were also examined. The swelling data obtained clearly showed that newly synthesized multi-stimuli NDF hydrogels exhibited multi-responsive capability to external stimuli like temperature and pH. The morphological data obtained showed that this new class of PNIPAAm/Dex-MA hybrid hydrogels had a wide range of unique three-dimensional porous network structures that depended on the composition ratio of the mixed DMF/water solvent during cross-linking reaction. This unique but versatile 3D porous network structures of NDF hydrogels were correlated to the data from thermo-induced swelling behavior, thermo-reversibility, pH-dependent swelling and ionic strength sensitivity.
Collapse
Affiliation(s)
- Sun Namkung
- Fiber and Polymer Science Program, Department of Textiles and Apparel and Biomedical Engineering Program, Cornell University, Ithaca, NY 14853-4401, USA
| | | |
Collapse
|
9
|
Choi JY, Lee DI, Kim CJ, Lee CH, Ahn IS. Synthesis of PEG hydrogel with dityrosine for multi-functionality and pH-dependent fluorescence. J IND ENG CHEM 2012. [DOI: 10.1016/j.jiec.2011.11.052] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
10
|
Sá-Lima H, Tuzlakoglu K, Mano JF, Reis RL. Thermoresponsive poly(N-isopropylacrylamide)-g-methylcellulose hydrogel as a three-dimensional extracellular matrix for cartilage-engineered applications. J Biomed Mater Res A 2011; 98:596-603. [DOI: 10.1002/jbm.a.33140] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2011] [Revised: 04/04/2011] [Accepted: 04/05/2011] [Indexed: 11/10/2022]
|
11
|
Galperin A, Long TJ, Ratner BD. Degradable, thermo-sensitive poly(N-isopropyl acrylamide)-based scaffolds with controlled porosity for tissue engineering applications. Biomacromolecules 2010; 11:2583-92. [PMID: 20836521 PMCID: PMC2952680 DOI: 10.1021/bm100521x] [Citation(s) in RCA: 145] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We have developed a thermoresponsive poly(N-isopropyl acrylamide)-based scaffold with degradability and controlled porosity. Biodegradable poly(N-isopropyl acrylamide) hydrogels were synthesized by photocopolymerization of N-isopropylacrylamide with 2-methylene-1,3-dioxepane and polycaprolactone dimethacrylate. The hydrogels' phase transition temperature, swelling, and viscoelastic properties, as well as hydrolytic degradability at 25 and 37 °C, were explored. A sphere-templating technique was applied to fabricate hydrogel scaffolds with controllable pore size and a highly interconnected porous structure. The scaffold pore diameter change as a function of temperature was evaluated and, as expected, pores decreased in diameter when the temperature was raised to 37 °C. 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) test results suggested neither the scaffolds nor their degradation products were cytotoxic to NIH3T3 cells. Scaffolds with 55 ± 5 μm pore diameter were loaded with NIH3T3 cells and then were warmed to 37 °C entrapping cells in pores approximately 39 μm in diameter, a size range we have found to be optimal for angiogenesis and biointegration. Cells showed uniform infiltration and an elongated morphology after 7 days of culture. Due to the controlled monodisperse pore diameter, highly interconnected architecture, fully degradable chemistry and thermoresponsive properties, the polyNIPAM-based scaffolds developed here are attractive for applications in tissue engineering.
Collapse
Affiliation(s)
- Anna Galperin
- University of Washington, 1705 Northeast Pacific Street, Seattle, WA 98195, USA
| | | | | |
Collapse
|
12
|
Mathews AS, Narine S. Poly[N-isopropyl acrylamide]-co-polyurethane copolymers for controlled release of urea. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/pola.24090] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
13
|
Synthesis and characterization of temperature-sensitive and biodegradable hydrogel based on N-isopropylacrylamide. OPEN CHEM 2010. [DOI: 10.2478/s11532-009-0144-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
AbstractBased on a biodegradable cross-linker, N-maleyl chitosan (N-MACH), a series of Poly(N-isopropylacrylamide) (PNIPAAm) and Poly(N-isopropylacrylamide-co-acrylamide) [P(NIPAAm-co-Am)] hydrogels were prepared, and their lower critical solution temperature (LCST), swelling kinetics, equilibrium swelling ratio in NaCl solution, and enzymatic degradation behavior in simulated gastric fluids (SGF) were discussed. The LCST did not change with different cross-linker contents. By altering the NIPAAm/Am molar ratio of P(NIPAAm-co-Am) hydrogels, the LCST could be increased to 39°C. The LCST of the hydrogel was significantly influenced by the monomer ratio of the NIPAAm/Am but not by the cross-linker content. In the swelling kinetics, all the dry hydrogels exhibited fast swelling behavior, and the swelling ratios were influenced by the cross-linker content and NIPAAm/Am molar ratios. Equilibrium swelling ratio of all the hydrogels decreased with increasing NaCl solution concentration. In enzymatic degradation tests, the weight loss of hydrogels was dependent on the cross-linker contents and the enzyme concentration.
Collapse
|
14
|
Sun G, Chu CC. Impregnation of tubular self-assemblies into dextran hydrogels. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:2831-2838. [PMID: 20141216 DOI: 10.1021/la902855e] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Amine groups are the building units of proteins. The incorporation of amine groups into polyethylene glycol diacrylate (PEGDA) hydrogel through dextran-allyl isocyanate-ethylamine (Dex-AE) enhances sustained protein release by introducing effective interactions. To investigate such an interaction effect and to improve protein release, we impregnated self-assembled tubular structures from dextran-bromoethylamine (Dex-BH) and dextran-chloroacetic acid (Dex-CA) into Dex-AE/PEGDA hydrogel. The morphology data obtained from scanning electron microscopy (SEM) reveal that pure PEGDA hydrogel had no effect on the distribution of the self-assembled tubules; the introduction of Dex-AE brought about the dispersion of these tubules, and an increase in Dex-AE content led to more evenly distributed structures. Moreover, the implantation of the self-assembled tubules had no distinct effect on the swelling capacity of the hybrid self-assembly embedded hydrogels. The in vitro albumin release study was carried out in a pH 7.4 buffer solution; the results show that the implantation of the self-assembly into the hydrogels reduced the burst release and prolonged the protein release time. These findings demonstrate that the impregnation of tubular self-assembly into hydrogel makes the hybrid hydrogel an excellent protein delivery system.
Collapse
Affiliation(s)
- Guoming Sun
- Fiber and Polymer Science Program, Department of Fiber Science & Apparel Design, Cornell University, Ithaca, New York 14853-4401, USA
| | | |
Collapse
|
15
|
Sun G, Chen FA, Chu CC. Effects of precursor and cross-linking parameters on the properties of dextran-allyl isocyanate-ethylamine/poly(ethylene glycol diacrylate) biodegradable hydrogels and their release of ovalbumin. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2010; 20:2003-22. [PMID: 19874674 DOI: 10.1163/156856208x396353] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
In this paper, we studied the effects of molecular weight of poly(ethylene glycol diacrylate) (PEGDA) precursor, the degree of substitution (DS) of both allyl isocyanate (AI) and amine groups in dextran-based precursor (Dex-AE), and photoinitiator concentration on Dex-AE/PEGDA hydrogel formation and its ovalbumin (OVA) release. FT-IR spectra showed chemical bond interaction between amine and urethane groups of the hydrogel carriers with OVA. The increase in PEGDA molecular weight led to a faster OVA release because of a more open gel network structure. The study on the DS of AI in Dex-AE precursor showed that an increase in AI did not result in a prominent gel network structure difference. However, the urethane groups in Dex-AE precursor showed some interactions with OVA and, thus, resulted in a slower release rate. The incorporation of amine group into Dex-AE precursor did not affect the gel network structure, but reduced the OVA release rate, and the level of reduction increased with an increasing amine group substitution into the Dex-AE precursor. This reduction could be attributed to the interaction between the amine groups in the gel carrier and OVA. An increase in the photoinitiator concentration showed no effect on the gel network structure or OVA release.
Collapse
Affiliation(s)
- Guoming Sun
- Department of Fiber Science and Apparel Design, Cornell University, Ithaca, NY 14853-4401, USA
| | | | | |
Collapse
|
16
|
Abstract
This review presents an overview of polysaccharide-conjugated synthetic polymers and their use in tissue-engineered scaffolds and drug-delivery applications. This topic will be divided into four categories: (1) polymeric materials modified with non-mammalian polysaccharides such as alginate, chitin, and dextran; (2) polymers modified with mammalian polysaccharides such as hyaluronan, chondroitin sulfate, and heparin; (3) multi-polysaccharide-derivatized polymer conjugate systems; and (4) polymers containing polysaccharide-mimetic molecules. Each section will discuss relevant conjugation techniques, analysis, and the impact of these materials as micelles, particles, or hydrogels used in in-vitro and in-vivo biomaterial applications.
Collapse
Affiliation(s)
- Aaron D. Baldwin
- Department of Materials Science and Engineering, University of Delaware, Newark, DE 19716
- Delaware Biotechnology Institute, 15 Innovation Way, Newark, DE 19711
| | - Kristi L. Kiick
- Department of Materials Science and Engineering, University of Delaware, Newark, DE 19716
- Delaware Biotechnology Institute, 15 Innovation Way, Newark, DE 19711
| |
Collapse
|
17
|
Jagur-Grodzinski J. Polymeric gels and hydrogels for biomedical and pharmaceutical applications. POLYM ADVAN TECHNOL 2009. [DOI: 10.1002/pat.1504] [Citation(s) in RCA: 280] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
18
|
Ju XJ, Xie R, Yang L, Chu LY. Biodegradable ‘intelligent’ materials in response to physical stimuli for biomedical applications. Expert Opin Ther Pat 2009; 19:493-507. [DOI: 10.1517/13543770902771282] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
|
19
|
Pérez P, Gallardo A, Corrigan OI, Román JS. Thermosensitivity of N-isopropylacrylamide hydrogels cross-linked with degradable cross-linker. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2008; 19:769-83. [PMID: 18534096 DOI: 10.1163/156856208784522074] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Thermosensitive N-isopropylacrylamide (NIPA)-based hydrogels have been prepared using a biodegradable pseudo-peptide (DMTLT, a tri-molecular adduct of tyrosine, lysine, tyrosine) as cross-linker. This new cross-linker provides a similar cross-linking efficiency as N,N' methylenbisacrylamide (BIS) (a standard biostable cross-linker) used as reference. The amount of DMTLT has shown to modulate, in addition to the cross-linking density, the transition temperature (the higher the amount of DMTLT, the lower the transition temperature), as well as the morphology and the whole aqueous behaviour. The incorporation of hydrophilic N,N'-dimethylacrylamide (DMA) increases the transition temperature, as expected. Finally, the matrices have exhibited in aqueous media a well-defined pulsatile behaviour in swelling and release of benzoic acid and dextran as models of ionisable molecules and non-ionisable macromolecules.
Collapse
Affiliation(s)
- Paloma Pérez
- Institute of Polymer Science and Technology, CSIC, Madrid, Spain
| | | | | | | |
Collapse
|
20
|
Wang X, Kluge JA, Leisk GG, Kaplan DL. Sonication-induced gelation of silk fibroin for cell encapsulation. Biomaterials 2007; 29:1054-64. [PMID: 18031805 DOI: 10.1016/j.biomaterials.2007.11.003] [Citation(s) in RCA: 419] [Impact Index Per Article: 24.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2007] [Accepted: 11/01/2007] [Indexed: 12/01/2022]
Abstract
Purified native silk fibroin forms beta-sheet-rich, physically cross-linked, hydrogels from aqueous solution, in a process influenced by environmental parameters. Previously we reported gelation times of days to weeks for aqueous native silk protein solutions, with high ionic strength and temperature and low pH responsible for increasing gelation kinetics. Here we report a novel method to accelerate the process and control silk fibroin gelation through ultrasonication. Depending on the sonication parameters, including power output and time, along with silk fibroin concentration, gelation could be controlled from minutes to hours, allowing the post-sonication addition of cells prior to final gel setting. Mechanistically, ultrasonication initiated the formation of beta-sheets by alteration in hydrophobic hydration, thus accelerating the formation of physical cross-links responsible for gel stabilization. K(+) at physiological concentrations and low pH promoted gelation, which was not observed in the presence of Ca(2+). The hydrogels were assessed for mechanical properties and proteolytic degradation; reported values matched or exceeded other cell-encapsulating gel material systems. Human bone marrow derived mesenchymal stem cells (hMSCs) were successfully incorporated into these silk fibroin hydrogels after sonication, followed by rapid gelation and sustained cell function. Sonicated silk fibroin solutions at 4%, 8%, and 12% (w/v), followed by mixing in hMSCs, gelled within 0.5-2 h. The cells grew and proliferated in the 4% gels over 21 days, while survival was lower in the gels with higher protein content. Thus, sonication provides a useful new tool with which to initiate rapid sol-gel transitions, such as for cell encapsulation.
Collapse
Affiliation(s)
- Xiaoqin Wang
- Department of Biomedical Engineering, Tufts University, 4 Colby Street, Medford, MA 02155, USA
| | | | | | | |
Collapse
|
21
|
|
22
|
Chen FM, Zhao YM, Sun HH, Jin T, Wang QT, Zhou W, Wu ZF, Jin Y. Novel glycidyl methacrylated dextran (Dex-GMA)/gelatin hydrogel scaffolds containing microspheres loaded with bone morphogenetic proteins: Formulation and characteristics. J Control Release 2007; 118:65-77. [PMID: 17250921 DOI: 10.1016/j.jconrel.2006.11.016] [Citation(s) in RCA: 96] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2006] [Revised: 10/22/2006] [Accepted: 11/14/2006] [Indexed: 11/19/2022]
Abstract
Novel thermomechanical hydrogel scaffolds containing our previously prepared microspheres loaded with bone morphogenetic proteins (BMP) were successfully generated by radical crosslinking and low dose gamma-irradiation from combination of two kind of biomaterials: glycidyl methacrylated dextran (Dex-GMA) and gelatin. The structure of those resulting smart hybrid hydrogels was evaluated by mercury intrusion porosimetry (MIP) and scanning electron microscopy (SEM) analyses, and as a function of the degree of Dex-GMA's substitution (DS), the proportion between Dex-GMA and gelatin, and the initial polyethyleneglycol (PEG) concentration used in the preparation of the hydrogels. The swelling and degradation properties and the temperature-sensitive drug release manner were determined by dynamic evaluation methods in vitro, and the gel content was also calculated. MIP analysis showed that by systematically altering the preparation parameters, the overall networks were clearly macroporous with pore sizes ranging from 5.6+/-4.2 to 37.7+/-13.7 microm. As expected, the pore size decreased as DS and initial PEG concentration increased, whereas the opposite was found for the gel content. Moreover, the porosity values ranged from 73.7+/-12.4% up to 89.6+/-6.3%. The SEM results also showed the inter-connective pores as well as microspheres encased into their porous structure of those hydrogels. The swelling and degradation properties of the resultant hydrogels varied according to the DS of Dex-GMA and initial PEG concentration, while the proportion between Dex-GMA and gelatin had no significant influence on those characterizations. By changing the composition ratio of the two precursors, the phase transition temperature (lower critical solution temperature, LSCT) of the hydrogel scaffolds could also be adjusted to be or near the body temperature, so BMP release from microsphere-hydrogel compounds could be accordingly controlled and the release period could be varied from 18 to more than 28 days. These results demonstrated that a novel temperature-sensitive and biodegradable Dex-GMA/gelatin scaffold containing microspheres loaded with BMP could be successfully developed from both dextran- and gelatin-based biomaterials, which could promisingly satisfy the need, desire, and expectation of both self-regulated drug delivery and tissue-engineering applications.
Collapse
Affiliation(s)
- Fa-Ming Chen
- Department of Periodontology and Oral Medicine, School of Stomatology, Fourth Military Medical University, Xi'an 710032, Shaanxi, China.
| | | | | | | | | | | | | | | |
Collapse
|
23
|
Prabaharan M, Mano JF. Stimuli-Responsive Hydrogels Based on Polysaccharides Incorporated with Thermo-Responsive Polymers as Novel Biomaterials. Macromol Biosci 2006; 6:991-1008. [PMID: 17128423 DOI: 10.1002/mabi.200600164] [Citation(s) in RCA: 175] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
In recent years, intelligent hydrogels which can change their swelling behavior and other properties in response to environmental stimuli such as temperature, pH, solvent composition and electric fields, have attracted great interest. The hydrogels based on polysaccharides incorporated with thermo-responsive polymers have shown unique properties such as biocompatibility, biodegradability, and biological functions in addition to the stimuli-responsive characters. These "smart" hydrogels exhibit single or multiple stimuli-responsive characters which could be used in biomedical applications, including controlled drug delivery, bioengineering or tissue engineering. This review focuses on the recent developments and future trends dealing with stimuli-responsive hydrogels based on grafting/blending of polysaccharides such as chitosan, alginate, cellulose, dextran and their derivatives with thermo-sensitive polymers. This review also screens the current applications of these hydrogels in the fields of drug delivery, tissue engineering and wound healing.
Collapse
Affiliation(s)
- Mani Prabaharan
- 3B's Research Group - Biomaterials, Biodegradables and Biomimetics, University of Minho, Campus of Gualtar, 4710-057 Braga, Portugal
| | | |
Collapse
|
24
|
Sun G, Chu CC. Synthesis, characterization of biodegradable dextran–allyl isocyanate–ethylamine/polyethylene glycol–diacrylate hydrogels and their in vitro release of albumin. Carbohydr Polym 2006. [DOI: 10.1016/j.carbpol.2006.01.015] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
25
|
Wang B, Zhu W, Zhang Y, Yang Z, Ding J. Synthesis of a chemically-crosslinked thermo-sensitive hydrogel film and in situ encapsulation of model protein drugs. REACT FUNCT POLYM 2006. [DOI: 10.1016/j.reactfunctpolym.2005.10.003] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|