1
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Lee C, Huang HS, Wang YY, Zhang YS, Chakravarthy RD, Yeh MY, Lin HC, Wei J. Stretchable, Adhesive, and Biocompatible Hydrogel Based on Iron-Dopamine Complexes. Polymers (Basel) 2023; 15:4378. [PMID: 38006102 PMCID: PMC10674470 DOI: 10.3390/polym15224378] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2023] [Revised: 10/15/2023] [Accepted: 10/31/2023] [Indexed: 11/26/2023] Open
Abstract
Hydrogels' exceptional mechanical strength and skin-adhesion characteristics offer significant advantages for various applications, particularly in the fields of tissue adhesion and wearable sensors. Herein, we incorporated a combination of metal-coordination and hydrogen-bonding forces in the design of stretchable and adhesive hydrogels. We synthesized four hydrogels, namely PAID-0, PAID-1, PAID-2, and PAID-3, consisting of acrylamide (AAM), N,N'-methylene-bis-acrylamide (MBA), and methacrylic-modified dopamine (DA). The impact of different ratios of iron (III) ions to DA on each hydrogel's performance was investigated. Our results demonstrate that the incorporation of iron-dopamine complexes significantly enhances the mechanical strength of the hydrogel. Interestingly, as the DA content increased, we observed a continuous and substantial improvement in both the stretchability and skin adhesiveness of the hydrogel. Among the hydrogels tested, PAID-3, which exhibited optimal mechanical properties, was selected for adhesion testing on various materials. Impressively, PAID-3 demonstrated excellent adhesion to diverse materials and, combined with the low cytotoxicity of PAID hydrogel, holds great promise as an innovative option for biomedical engineering applications.
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Affiliation(s)
- Celine Lee
- Department of Chemistry, Chung Yuan Christian University, No. 200, Zhongbei Rd., Zhongli Dist., Taoyuan City 320314, Taiwan; (C.L.); (H.-S.H.); (Y.-Y.W.); (Y.-S.Z.)
| | - He-Shin Huang
- Department of Chemistry, Chung Yuan Christian University, No. 200, Zhongbei Rd., Zhongli Dist., Taoyuan City 320314, Taiwan; (C.L.); (H.-S.H.); (Y.-Y.W.); (Y.-S.Z.)
| | - Yun-Ying Wang
- Department of Chemistry, Chung Yuan Christian University, No. 200, Zhongbei Rd., Zhongli Dist., Taoyuan City 320314, Taiwan; (C.L.); (H.-S.H.); (Y.-Y.W.); (Y.-S.Z.)
| | - You-Sheng Zhang
- Department of Chemistry, Chung Yuan Christian University, No. 200, Zhongbei Rd., Zhongli Dist., Taoyuan City 320314, Taiwan; (C.L.); (H.-S.H.); (Y.-Y.W.); (Y.-S.Z.)
| | - Rajan Deepan Chakravarthy
- Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, No. 1001, Daxue Rd., East Dist., Hsinchu City 300093, Taiwan;
| | - Mei-Yu Yeh
- Department of Chemistry, Chung Yuan Christian University, No. 200, Zhongbei Rd., Zhongli Dist., Taoyuan City 320314, Taiwan; (C.L.); (H.-S.H.); (Y.-Y.W.); (Y.-S.Z.)
| | - Hsin-Chieh Lin
- Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, No. 1001, Daxue Rd., East Dist., Hsinchu City 300093, Taiwan;
| | - Jeng Wei
- Heart Center, Cheng Hsin General Hospital, No. 45, Cheng Hsin St., Beitou Dist., Taipei City 112401, Taiwan
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2
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Shen Z, Zhang C, Wang T, Xu J. Advances in Functional Hydrogel Wound Dressings: A Review. Polymers (Basel) 2023; 15:polym15092000. [PMID: 37177148 PMCID: PMC10180742 DOI: 10.3390/polym15092000] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2023] [Revised: 04/20/2023] [Accepted: 04/21/2023] [Indexed: 05/15/2023] Open
Abstract
One of the most advanced, promising, and commercially viable research issues in the world of hydrogel dressing is gaining functionality to achieve improved therapeutic impact or even intelligent wound repair. In addition to the merits of ordinary hydrogel dressings, functional hydrogel dressings can adjust their chemical/physical properties to satisfy different wound types, carry out the corresponding reactions to actively create a healing environment conducive to wound repair, and can also control drug release to provide a long-lasting benefit. Although a lot of in-depth research has been conducted over the last few decades, very few studies have been properly summarized. In order to give researchers a basic blueprint for designing functional hydrogel dressings and to motivate them to develop ever-more intelligent wound dressings, we summarized the development of functional hydrogel dressings in recent years, as well as the current situation and future trends, in light of their preparation mechanisms and functional effects.
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Affiliation(s)
- Zihao Shen
- Aulin College, Northeast Forestry University, Harbin 150040, China
| | - Chenrui Zhang
- Aulin College, Northeast Forestry University, Harbin 150040, China
| | - Ting Wang
- Aulin College, Northeast Forestry University, Harbin 150040, China
- College of Chemistry, Chemical Engineering and Resource Utilization, Northeast Forestry University, 26 Hexing Road, Harbin 150040, China
| | - Juan Xu
- National Research Institute for Family Planning, Haidian District, No. 12, Da Hui Si Road, Beijing 100081, China
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3
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Xiong J, Zhan T, Hu Y, Guo Z, Wang S. A tough, stretchable, freeze-tolerated double-cross-linked conductive hydrogel and its application in flexible strain sensors. Colloid Polym Sci 2022. [DOI: 10.1007/s00396-022-05045-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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4
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Owh C, Ow V, Lin Q, Wong JHM, Ho D, Loh XJ, Xue K. Bottom-up design of hydrogels for programmable drug release. BIOMATERIALS ADVANCES 2022; 141:213100. [PMID: 36096077 DOI: 10.1016/j.bioadv.2022.213100] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2022] [Revised: 08/22/2022] [Accepted: 08/27/2022] [Indexed: 06/15/2023]
Abstract
Hydrogels are a promising drug delivery system for biomedical applications due to their biocompatibility and similarity to native tissue. Programming the release rate from hydrogels is critical to ensure release of desired dosage over specified durations, particularly with the advent of more complicated medical regimens such as combinatorial drug therapy. While it is known how hydrogel structure affects release, the parameters that can be explicitly controlled to modulate release ab initio could be useful for hydrogel design. In this review, we first survey common physical models of hydrogel release. We then extensively go through the various input parameters that we can exercise direct control over, at the levels of synthesis, formulation, fabrication and environment. We also illustrate some examples where hydrogels can be programmed with the input parameters for temporally and spatially defined release. Finally, we discuss the exciting potential and challenges for programming release, and potential implications with the advent of machine learning.
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Affiliation(s)
- Cally Owh
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, #08-03 Innovis, Singapore 138634, Singapore; NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore (NUS), 21 Lower Kent Ridge Rd, Singapore 119077, Singapore
| | - Valerie Ow
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, #08-03 Innovis, Singapore 138634, Singapore
| | - Qianyu Lin
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, #08-03 Innovis, Singapore 138634, Singapore; NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore (NUS), 21 Lower Kent Ridge Rd, Singapore 119077, Singapore
| | - Joey Hui Min Wong
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, #08-03 Innovis, Singapore 138634, Singapore
| | - Dean Ho
- Department of Biomedical Engineering, National University of Singapore, 4 Engineering Drive 3, Engineering Block 4, Singapore 117583, Singapore
| | - Xian Jun Loh
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, #08-03 Innovis, Singapore 138634, Singapore; Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117575, Singapore; School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, #01-30 General Office, Block N4.1, Singapore 639798, Singapore.
| | - Kun Xue
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, #08-03 Innovis, Singapore 138634, Singapore.
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5
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Fallahi H, Daemi H, Bagheri F, Baghaban Eslaminejad M. A supramolecular injectable hydrogel based on β-cyclodextrin-grafted alginate and pluronic-amine loaded with kartogenin for chondrogenic differentiation of mesenchymal stem cells. Biomed Mater 2022; 17. [PMID: 35995044 DOI: 10.1088/1748-605x/ac8bbd] [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: 01/24/2022] [Accepted: 08/22/2022] [Indexed: 11/11/2022]
Abstract
Owing to the similarity of hydrogels to cartilage ECM, they have been extensively utilized in the chondral lesions. Moreover, their tunable administration properties are desirable for reducing injuries in lesion sites. Generally, injectable hydrogels are mechanically weak, requiring some modifications for being used as a cell carrier in place of articular cartilage. In this study, a combination of β-cyclodextrin-grafted alginate (Alg-β-CD) and pluronic-amine (PA) with multiple physical crosslinking was used for the first time. Supramolecular interactions, including electrostatic forces, host-guest interaction, and hydrophobic interaction with increasing temperature maintain injectability of hydrogels while these interactions boost mechanical properties to the extent that shear modulus surpassed 40 kPa. Vacant β-CD cavities in conjunction with gel network was exploited for kartogenin (KGN) loading. All groups had gel time of less than one minute and gel temperature was 28 ℃. No toxic effect of hydrogels on encapsulated cells was observed. While the optimum combination of polymers provided a sustainable release for KGN, it also extended the in vitro degradation time of hydrogels from 6 days to 2 weeks. KGN facilitated encapsulated mesenchymal stem cells (MSCs) differentiation towards chondrocytes. Taken together, the synthesized hydrogel proved to be a promising candidate for being utilized in cartilage regeneration.
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Affiliation(s)
- Hooman Fallahi
- Department of Biomedical Engineering, Tarbiat Modares University, jalale al ahmad, Tehran, 0098, Iran (the Islamic Republic of)
| | - Hamed Daemi
- Cell Enginerring, Royan institute, Banihashem street, Tehran, 0098, Iran (the Islamic Republic of)
| | - Fatemeh Bagheri
- Department of Biotechnology, Tarbiat Modares University, Jallale al ahmad, Tehran, 0098, Iran (the Islamic Republic of)
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Wong JHM, Tan RPT, Chang JJ, Ow V, Yew PYM, Chee PL, Kai D, Loh XJ, Xue K. Dynamic grafting of carboxylates onto poly(vinyl alcohol) polymers for supramolecularly-crosslinked hydrogel formation. Chem Asian J 2022; 17:e202200628. [PMID: 35977910 DOI: 10.1002/asia.202200628] [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: 06/14/2022] [Revised: 08/15/2022] [Indexed: 11/05/2022]
Abstract
Supramolecular hydrogels have attracted considerable interest due to their unique stimuli-responsive and self-healing properties. However, these hydrogel systems are usually achieved by covalent grafting of supramolecular units onto the polymer backbone, which in turn limits their reprocessability. Herein, we prepared a supramolecular hydrogel system by forming dynamic covalent crosslinks between 4-carboxyphenylboronic acid (CPBA) and polyvinyl alcohol (PVA). The system was then further crosslinked with either calcium ions or branched polyethylenimine (PEI) to generate hydrogels with distinctly different properties. Incorporation of calcium ions resulted in the formation of hydrogels with higher storage modulus of 7290 Pa but without self-healing properties. On the other hand, PEI-crosslinked hydrogel (PVA-CPBA-PEI) exhibited >2000% critical strain value, demonstrated high stability over 52 days and showed sustained antibacterial effect. A combination of supramolecular interactions and dynamic covalent crosslinks can be an alternate strategy to fabricate next generation hydrogel materials.
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Affiliation(s)
- Joey Hui Min Wong
- Institute of Materials Research and Engineering, Soft Materials, SINGAPORE
| | | | - Jun Jie Chang
- Institute of Materials Research and Engineering, Soft Materials, SINGAPORE
| | - Valerie Ow
- Institute of Materials Research and Engineering, Soft Materials, SINGAPORE
| | | | - Pei Lin Chee
- Institute of Materials Research and Engineering, Soft Materials, SINGAPORE
| | - Dan Kai
- Institute of Materials Research and Engineering, Strategic Research Initiative, SINGAPORE
| | - Xian Jun Loh
- Institute of Materials Research and Engineering, Soft Materials, SINGAPORE
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7
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Wang S, Ong PJ, Liu S, Thitsartarn W, Tan MJBH, Suwardi A, Zhu Q, Loh XJ. Recent advances in host-guest supramolecular hydrogels for biomedical applications. Chem Asian J 2022; 17:e202200608. [PMID: 35866560 DOI: 10.1002/asia.202200608] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Revised: 07/18/2022] [Indexed: 11/09/2022]
Abstract
The recognition-directed host-guest interaction is recognized as a valuable tool for creating supramolecular polymers. Functional hydrogels constructed through the dynamic and reversible host-guest complexation are endowed with a great many appealing features, such as superior self-healing, injectability, flexibility, stimuli-responsiveness and biocompatibility, which are crucial for biological and medicinal applications. With numerous topological structures and host-guest combinations established previously, recent breakthroughs in this area mostly focus on further improvement and fine-tuning of various properties for practical utilizations. The current contribution provides a comprehensive overview of the latest developments in host-guest supramolecular hydrogels, with a particular emphasis on the innovative molecular-level design strategies and hydrogel formation methodologies targeting at a wide range of active biomedical domains, including drug delivery, 3D printing, wound healing, tissue engineering, artificial actuators, biosensors, etc. Furthermore, a brief conclusion and discussion on the steps forward to bring these smart hydrogels to clinical practice is also presented.
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Affiliation(s)
- Suxi Wang
- Institute of Materials Research and Engineering, Institute of Materials Research and Engineering, SINGAPORE
| | - Pin Jin Ong
- Institute of Materials Research and Engineering, Institute of Materials Research and Engineering, SINGAPORE
| | - Songlin Liu
- Institute of Materials Research and Engineering, Institute of Materials Research and Engineering, SINGAPORE
| | - Warintorn Thitsartarn
- Institute of Materials Research and Engineering, Institute of Materials Research and Engineering, SINGAPORE
| | | | - Ady Suwardi
- Institute of Materials Research and Engineering, Institute of Materials Research and Engineering, SINGAPORE
| | - Qiang Zhu
- Institute of Materials Research and Engineering, Institute of Materials Research and Engineering, 2 Fusionopolis Way, 138634, Singapore, SINGAPORE
| | - Xian Jun Loh
- Institute of Materials Research and Engineering, Institute of Materials Research and Engineering, SINGAPORE
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8
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Hocken A, Beyer FL, Lee JS, Grim BJ, Mithaiwala H, Green MD. Covalently integrated silica nanoparticles in poly(ethylene glycol)-based acrylate resins: thermomechanical, swelling, and morphological behavior. SOFT MATTER 2022; 18:1019-1033. [PMID: 35018933 DOI: 10.1039/d1sm01377g] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Nanocomposites integrate functional nanofillers into viscoelastic matrices for electronics, lightweight structural materials, and tissue engineering. Herein, the effect of methacrylate-functionalized (MA-SiO2) and vinyl-functionalized (V-SiO2) silica nanoparticles on the thermal, mechanical, physical, and morphological characteristics of poly(ethylene glycol) (PEG) nanocomposites was investigated. The gel fraction of V-SiO2 composites decreases upon addition of 3.8 wt% but increases with further addition (>7.4 wt%) until it reaches a plateau at 10.7 wt%. The MA-SiO2 induced no significant changes in gel fraction and both V-SiO2 and MA-SiO2 nanoparticles had a negligible impact on the nanocomposite glass transition temperature and water absorption. The Young's modulus and ultimate compressive stress increased with increasing nanoparticle concentration for both nanoparticles. Due to the higher crosslink density, MA-SiO2 composites reached a maximum mechanical stress at a concentration of 7.4 wt%, while V-SiO2 composites reached a maximum at a concentration of 10.7 wt%. Scanning electron microscopy, transmission electron microscopy, and small-angle X-ray scattering revealed a bimodal size distribution for V-SiO2 and a monomodal size distribution for MA-SiO2. Although aggregates were observed for both nanoparticle surface treatments, V-SiO2 dispersion was poor while MA-SiO2 were generally well-dispersed. These findings lay the framework for silica nanofillers in PEG-based nanocomposites for advanced manufacturing applications.
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Affiliation(s)
- Alexis Hocken
- Department of Chemical Engineering; School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, AZ 85287, USA.
| | - Frederick L Beyer
- U.S. DEVCOM Army Research Laboratory, Aberdeen Proving Ground, MD 21005, USA
| | - Jae Sang Lee
- Department of Chemical Engineering; School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, AZ 85287, USA.
| | - Bradley J Grim
- Department of Chemical Engineering; School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, AZ 85287, USA.
| | - Husain Mithaiwala
- Department of Chemical Engineering; School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, AZ 85287, USA.
| | - Matthew D Green
- Department of Chemical Engineering; School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, AZ 85287, USA.
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9
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Ow V, Loh XJ. Recent developments of temperature‐responsive polymers for ophthalmic applications. JOURNAL OF POLYMER SCIENCE 2022. [DOI: 10.1002/pol.20210907] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Valerie Ow
- Institute of Materials Research and Engineering A*STAR (Agency for Science, Technology and Research) Singapore Singapore
| | - Xian Jun Loh
- Institute of Materials Research and Engineering A*STAR (Agency for Science, Technology and Research) Singapore Singapore
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10
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Zhang K, Xue K, Loh XJ. Thermo-Responsive Hydrogels: From Recent Progress to Biomedical Applications. Gels 2021; 7:77. [PMID: 34202514 PMCID: PMC8293033 DOI: 10.3390/gels7030077] [Citation(s) in RCA: 63] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Revised: 06/21/2021] [Accepted: 06/22/2021] [Indexed: 12/29/2022] Open
Abstract
Thermogels are also known as thermo-sensitive or thermo-responsive hydrogels and can undergo a sol-gel transition as the temperature increases. This thermogelling behavior is the result of combined action from multiscale thermo-responsive mechanisms. From micro to macro, these mechanisms can be attributed to LCST behavior, micellization, and micelle aggregation of thermogelling polymers. Due to its facile phase conversion properties, thermogels are injectable yet can form an in situ gel in the human body. Thermogels act as a useful platform biomaterial that operates at physiological body temperatures. The purpose of this review is to summarize the recent progress in thermogel research, including investigations on the thermogel gelation mechanism and its applications in drug delivery, 3D cell culture, and tissue engineering. The review also discusses emerging directions in the study of thermogels.
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Affiliation(s)
- Kaiwen Zhang
- Department of Biomedical Engineering, College of Engineering, Southern University of Science and Technology (SUSTech), 1088 Xueyuan Avenue, Shenzhen 518055, China;
| | - Kun Xue
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Singapore 138634, Singapore
| | - Xian Jun Loh
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Singapore 138634, Singapore
- Department of Materials Science and Engineering, National University of Singapore (NUS), 9 Engineering Drive 1, Singapore 117576, Singapore
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11
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Zhao X, Chen X, Yuk H, Lin S, Liu X, Parada G. Soft Materials by Design: Unconventional Polymer Networks Give Extreme Properties. Chem Rev 2021; 121:4309-4372. [PMID: 33844906 DOI: 10.1021/acs.chemrev.0c01088] [Citation(s) in RCA: 295] [Impact Index Per Article: 98.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Hydrogels are polymer networks infiltrated with water. Many biological hydrogels in animal bodies such as muscles, heart valves, cartilages, and tendons possess extreme mechanical properties including being extremely tough, strong, resilient, adhesive, and fatigue-resistant. These mechanical properties are also critical for hydrogels' diverse applications ranging from drug delivery, tissue engineering, medical implants, wound dressings, and contact lenses to sensors, actuators, electronic devices, optical devices, batteries, water harvesters, and soft robots. Whereas numerous hydrogels have been developed over the last few decades, a set of general principles that can rationally guide the design of hydrogels using different materials and fabrication methods for various applications remain a central need in the field of soft materials. This review is aimed at synergistically reporting: (i) general design principles for hydrogels to achieve extreme mechanical and physical properties, (ii) implementation strategies for the design principles using unconventional polymer networks, and (iii) future directions for the orthogonal design of hydrogels to achieve multiple combined mechanical, physical, chemical, and biological properties. Because these design principles and implementation strategies are based on generic polymer networks, they are also applicable to other soft materials including elastomers and organogels. Overall, the review will not only provide comprehensive and systematic guidelines on the rational design of soft materials, but also provoke interdisciplinary discussions on a fundamental question: why does nature select soft materials with unconventional polymer networks to constitute the major parts of animal bodies?
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Affiliation(s)
- Xuanhe Zhao
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.,Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Xiaoyu Chen
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Hyunwoo Yuk
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Shaoting Lin
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Xinyue Liu
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - German Parada
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
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12
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Gao Y, Deng A, Wu X, Sun C, Qi C. Injectable multi-responsive hydrogels cross-linked by responsive macromolecular micelles. REACT FUNCT POLYM 2021. [DOI: 10.1016/j.reactfunctpolym.2021.104866] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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13
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Xue K, Liu Z, Lin Q, Lim JYC, Tang KY, Wong SL, Parikh BH, Su X, Loh XJ. PCL-Based Thermogelling Polymer: Molecular Weight Effects on Its Suitability as Vitreous Tamponade. ACS APPLIED BIO MATERIALS 2020; 3:9043-9053. [DOI: 10.1021/acsabm.0c01266] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Kun Xue
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, #08-03 Innovis, 138634 Singapore
| | - Zengping Liu
- Department of Ophthalmology, Yong Loo Lin School of Medicine, National University of Singapore, 1E Kent Ridge Road, NUHS Tower Block, Level 7, 119228 Singapore
- Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research (A*STAR), 61 Biopolis Drive Proteos, 138673 Singapore
| | - Qianyu Lin
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, #08-03 Innovis, 138634 Singapore
- Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, 117575 Singapore
| | - Jason Y. C. Lim
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, #08-03 Innovis, 138634 Singapore
| | - Karen Yuanting Tang
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, #08-03 Innovis, 138634 Singapore
| | - Soo Lin Wong
- Department of Ophthalmology, Yong Loo Lin School of Medicine, National University of Singapore, 1E Kent Ridge Road, NUHS Tower Block, Level 7, 119228 Singapore
| | - Bhav Harshad Parikh
- Department of Ophthalmology, Yong Loo Lin School of Medicine, National University of Singapore, 1E Kent Ridge Road, NUHS Tower Block, Level 7, 119228 Singapore
- Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research (A*STAR), 61 Biopolis Drive Proteos, 138673 Singapore
| | - Xinyi Su
- Department of Ophthalmology, Yong Loo Lin School of Medicine, National University of Singapore, 1E Kent Ridge Road, NUHS Tower Block, Level 7, 119228 Singapore
- Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research (A*STAR), 61 Biopolis Drive Proteos, 138673 Singapore
- Singapore Eye Research Institute, 11 Third Hospital Avenue, 168751 Singapore
| | - Xian Jun Loh
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, #08-03 Innovis, 138634 Singapore
- Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, 117575 Singapore
- Singapore Eye Research Institute, 11 Third Hospital Avenue, 168751 Singapore
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14
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Dai W, Sun M, Leng X, Hu X, Ao Y. Recent Progress in 3D Printing of Elastic and High-Strength Hydrogels for the Treatment of Osteochondral and Cartilage Diseases. Front Bioeng Biotechnol 2020; 8:604814. [PMID: 33330436 PMCID: PMC7729093 DOI: 10.3389/fbioe.2020.604814] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Accepted: 11/03/2020] [Indexed: 11/13/2022] Open
Abstract
Despite considerable progress for the regenerative medicine, repair of full-thickness articular cartilage defects and osteochondral interface remains challenging. This low efficiency is largely due to the difficulties in recapitulating the stratified zonal architecture of articular cartilage and engineering complex gradients for bone-soft tissue interface. This has led to increased interest in three-dimensional (3D) printing technologies in the field of musculoskeletal tissue engineering. Printable and biocompatible hydrogels are attractive materials for 3D printing applications because they not only own high tunability and complexity, but also offer favorable biomimetic environments for live cells, such as porous structure, high water content, and bioactive molecule incorporation. However, conventional hydrogels are usually mechanically weak and brittle, which cannot reach the mechanical requirements for repair of articular cartilage defects and osteochondral interface. Therefore, the development of elastic and high-strength hydrogels for 3D printing in the repairment of cartilage defects and osteochondral interface is crucial. In this review, we summarized the recent progress in elastic and high-strength hydrogels for 3D printing and categorized them into six groups, namely ion bonds interactions, nanocomposites integrated in hydrogels, supramolecular guest-host interactions, hydrogen bonds interactions, dynamic covalent bonds interactions, and hydrophobic interactions. These 3D printed elastic and high-strength hydrogels may provide new insights for the treatment of osteochondral and cartilage diseases.
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Affiliation(s)
- Wenli Dai
- Beijing Key Laboratory of Sports Injuries, Institute of Sports Medicine, Peking University Third Hospital, Beijing, China
| | - Muyang Sun
- Beijing Key Laboratory of Sports Injuries, Institute of Sports Medicine, Peking University Third Hospital, Beijing, China
| | - Xi Leng
- Medical Imaging Center, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Xiaoqing Hu
- Beijing Key Laboratory of Sports Injuries, Institute of Sports Medicine, Peking University Third Hospital, Beijing, China
| | - Yingfang Ao
- Beijing Key Laboratory of Sports Injuries, Institute of Sports Medicine, Peking University Third Hospital, Beijing, China
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15
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Zhang X, Yang X, Dai Q, Zhang Y, Pan H, Yu C, Feng Q, Zhu S, Dong H, Cao X. Tough thermoplastic hydrogels with re-processability and recyclability for strain sensors. J Mater Chem B 2020; 9:176-186. [PMID: 33237117 DOI: 10.1039/d0tb02049d] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Tough hydrogels with the ability to be repeatedly processed into various shapes as thermoplastics are highly desired in advanced medical devices and tissue engineering. Here, we have developed a kind of versatile supramolecular hydrogel with a network cross-linked by double hydrogen bonds from poly(N-acryloyl glycinamide) (PNAGA). The resulting PNAGA-30 hydrogels (30 wt% solid content) are tough, re-processable, and recyclable similar to thermoplastics. The hydrogels in the form of fragments can be easily re-processed into various shapes including sheet, filament, cylinder and other complex shapes by using simple stamping and injection methods. The mechanical properties of the re-programed hydrogels are comparable to the properties of the original hydrogels. The re-processability and robust mechanical properties of the PNAGA hydrogels are promising for practical applications in soft materials, tissue engineering and wearable devices. Furthermore, the PNAGA-30&LiCl ionic hydrogels can be fabricated by simply compositing LiCl into thermoplastic hydrogels. The PNAGA-30&LiCl hydrogels can function as multifunctional strain sensors to monitor large human movements and tiny vibrations, thereby showing great application potential in robotics, biomedical prosthetics, personal healthcare monitoring and so on.
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Affiliation(s)
- Xiaohua Zhang
- School of Materials Science and Engineering, South China University of Technology, Guangzhou 510006, P. R. China.
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16
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Use of biomaterials for sustained delivery of anti-VEGF to treat retinal diseases. Eye (Lond) 2020; 34:1341-1356. [PMID: 32001821 PMCID: PMC7376230 DOI: 10.1038/s41433-020-0770-y] [Citation(s) in RCA: 54] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Revised: 12/27/2019] [Accepted: 01/13/2020] [Indexed: 12/11/2022] Open
Abstract
Anti-vascular endothelial growth factors (anti-VEGF) have become the most common treatment modality for many retinal diseases. These include neovascular age-related macular degeneration (n-AMD), proliferative diabetic retinopathy (PDR) and retinal vein occlusions (RVO). However, these drugs are administered via intravitreal injections that are associated with sight-threatening complications. The most feared of these complications is endophthalmitis, a severe infection of the eye with extremely poor visual outcomes. Patients with retinal diseases typically have to undergo multiple injections before achieving the desired therapeutic effect. Each injection incurs the risk of the sight-threatening complications. As such, there has been great interest in developing sustained delivery platforms for anti-VEGF agents to the posterior segment of the eye. In recent years, there have been various strategies that have been conceptualised. These include non-biodegradable implants, nano-formulations and hydrogels. In this review, the barriers of drug delivery to the posterior segment of the eye will be explained. The characteristics of an ideal sustained delivery platform will then be discussed. Finally, the current available strategies will be analysed with the above-mentioned characteristics in mind to determine the advantages and disadvantages of each sustained drug delivery modality. Through the above, this review attempts to provide an overview of the sustained delivery platforms in their various phases of development.
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Zheng K, He C, Nour HF, Zhang Z, Yuan T, Traboulsi H, Mazher J, Trabolsi A, Fang L, Olson MA. Augmented polyhydrazone formation in water by template-assisted polymerization using dual-purpose supramolecular templates. Polym Chem 2020. [DOI: 10.1039/c9py01476d] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Template-assisted polymerization using donor–acceptor supramolecular templates results in higher Mw and Mn values, decreased critical hydrogelation concentrations, and increased gel recovery velocity following shear-induced breakdown.
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18
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Lin Q, Lim JYC, Xue K, Chee CPT, Loh XJ. Supramolecular thermogels from branched PCL-containing polyurethanes. RSC Adv 2020; 10:39109-39120. [PMID: 35518420 PMCID: PMC9057440 DOI: 10.1039/d0ra07426h] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2020] [Accepted: 10/18/2020] [Indexed: 11/21/2022] Open
Abstract
Thermogels are temperature-responsive hydrogels which are most commonly formed by supramolecular self-assembly of polymer amphiphiles comprising of both hydrophobic and hydrophilic segments. Although polyurethane thermogels have shown great promise as biomaterials, their synthesis by step-growth polymerisation of diols and diisocyanates can also result in formation of allophanate branches, which arise from the reaction between free isocyanate groups and urethane linkages along the polymer backbone. In this paper, we investigate the effects of different synthetic conditions on the degree of allophanate branching on polyurethane amphiphiles, and explore the influences of these branches on the polymers' critical micelle concentration (CMC), thermodynamics of micellization and subsequent thermogel properties. Our findings offer new insights into the relationship between polymer structure, micelle and gel properties. These results highlight the importance of taking polymer branching into account for understanding the hierarchical self-assembly of polymer amphiphiles and the resulting thermogel properties and behaviour. Polymer branching exerts notable influence on the spontaneous temperature-triggered self-assembly of amphiphilic polymers into micelles and thermogels in water.![]()
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Affiliation(s)
- Qianyu Lin
- NUS Graduate School for Integrative Sciences and Engineering
- National University of Singapore
- Singapore 119077
| | - Jason Y. C. Lim
- Soft Materials Department Institute of Materials Research and Engineering
- Agency for Science, Technology and Research (A*STAR)
- Innovis
- Singapore 138634
| | - Kun Xue
- Soft Materials Department Institute of Materials Research and Engineering
- Agency for Science, Technology and Research (A*STAR)
- Innovis
- Singapore 138634
| | - Celestine P. T. Chee
- Soft Materials Department Institute of Materials Research and Engineering
- Agency for Science, Technology and Research (A*STAR)
- Innovis
- Singapore 138634
| | - Xian Jun Loh
- Soft Materials Department Institute of Materials Research and Engineering
- Agency for Science, Technology and Research (A*STAR)
- Innovis
- Singapore 138634
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Xue K, Zhao X, Zhang Z, Qiu B, Tan QSW, Ong KH, Liu Z, Parikh BH, Barathi VA, Yu W, Wang X, Lingam G, Hunziker W, Su X, Loh XJ. Sustained delivery of anti-VEGFs from thermogel depots inhibits angiogenesis without the need for multiple injections. Biomater Sci 2019; 7:4603-4614. [DOI: 10.1039/c9bm01049a] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Polyurethane thermogels show sustained delivery of bioactive anti-VEGFs therapeutics to the eye.
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20
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Liu X, Fan X, Jiang L, Loh XJ, Wu YL, Li Z. Biodegradable polyester unimolecular systems as emerging materials for therapeutic applications. J Mater Chem B 2018; 6:5488-5498. [PMID: 32254961 DOI: 10.1039/c8tb01883a] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Unimolecular micelles, as a class of single-molecular micelles, are structurally stable regardless of their concentrations or alterations of the outer environment such as pH, temperature, ion strength etc. in comparison with conventional polymeric micelles. Polyester unimolecular micelles are extensively applied in bio-medical fields because of their stability, biocompatibility, biodegradability, structural-controllabilty etc. In this review, the most recent developments in polyester unimolecular micelle designs in terms of Boltorn polymer H40 core, cyclodextrin, dendrimer or dendrimer-like polymer, or polyhedral oligomeric silsesquioxane (POSS) based polyester unimolecular micelles are presented. The significance and application in biomedical fields including drug delivery, bio-imaging and theranostics are also classified in this review. Finally, the remaining challenges and future perspectives for further development of unimolecular micelles as therapeutic materials are also discussed.
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Affiliation(s)
- Xuan Liu
- School of Pharmaceutical Sciences, Xiamen University, Xiamen 361102, P. R. China.
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