1
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Yew PYM, Chee PL, Lin Q, Owh C, Li J, Dou QQ, Loh XJ, Kai D, Zhang Y. Hydrogel for light delivery in biomedical applications. Bioact Mater 2024; 37:407-423. [PMID: 38689660 PMCID: PMC11059474 DOI: 10.1016/j.bioactmat.2024.03.031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Revised: 03/06/2024] [Accepted: 03/26/2024] [Indexed: 05/02/2024] Open
Abstract
Traditional optical waveguides or mediums are often silica-based materials, but their applications in biomedicine and healthcare are limited due to the poor biocompatibility and unsuitable mechanical properties. In term of the applications in human body, a biocompatible hydrogel system with excellent optical transparency and mechanical flexibility could be beneficial. In this review, we explore the different designs of hydrogel-based optical waveguides derived from natural and synthetic sources. We highlighted key developments such as light emitting contact lenses, implantable optical fibres, biosensing systems, luminating and fluorescent materials. Finally, we expand further on the challenges and perspectives for hydrogel waveguides to achieve clinical applications.
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Affiliation(s)
- Pek Yin Michelle Yew
- Institute of Sustainability for Chemicals, Energy and Environment (ISCE2), Agency for Science, Technology and Research (A*STAR), 1 Pesek Road, 627833, Singapore
- Department of Biomedical Engineering, Faculty of Engineering, National University of Singapore, Singapore, 117583, Singapore
| | - Pei Lin Chee
- Institute of Sustainability for Chemicals, Energy and Environment (ISCE2), Agency for Science, Technology and Research (A*STAR), 1 Pesek Road, 627833, Singapore
| | - Qianyu Lin
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis #08-03, Singapore, 138634, Singapore
| | - Cally Owh
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis #08-03, Singapore, 138634, Singapore
| | - Jiayi Li
- School of Biological Sciences, Nanyang Technological University, 60 Nanyang Drive, Singapore, 637551, Singapore
| | - Qing Qing Dou
- School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, China
| | - Xian Jun Loh
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis #08-03, Singapore, 138634, Singapore
| | - Dan Kai
- Institute of Sustainability for Chemicals, Energy and Environment (ISCE2), Agency for Science, Technology and Research (A*STAR), 1 Pesek Road, 627833, Singapore
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis #08-03, Singapore, 138634, Singapore
- School of Chemistry, Chemical Engineering and Biotechnology, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
| | - Yong Zhang
- Department of Biomedical Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR, China
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2
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Chee PL, Sathasivam T, Tan YC, Wu W, Leow Y, Lim QRT, Yew PYM, Zhu Q, Kai D. Nanochitin for sustainable and advanced manufacturing. Nanoscale 2024; 16:3269-3292. [PMID: 38265441 DOI: 10.1039/d3nr05533g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2024]
Abstract
Presently, the rapid depletion of resources and drastic climate change highlight the importance of sustainable development. In this case, nanochitin derived from chitin, the second most abundant renewable polymer in the world, possesses numerous advantages, including toughness, easy processability and biodegradability. Furthermore, it exhibits better dispersibility in various solvents and higher reactivity than chitin owing to its increased surface area to volume ratio. Additionally, it is the only natural polysaccharide that contains nitrogen. Therefore, it is valuable to further develop this innovative technology. This review summarizes the recent developments in nanochitin and specifically identifies sustainable strategies for its preparation. Additionally, the different biomass sources that can be exploited for the extraction of nanochitin are highlighted. More importantly, the life cycle assessment of nanochitin preparation is discussed, followed by its applications in advanced manufacturing and perspectives on the valorization of chitin waste.
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Affiliation(s)
- Pei Lin Chee
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis #08-03, 138634, Singapore.
- Institute of Sustainability for Chemicals, Energy and Environment (ISCE2), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis #08-03, 138634, Singapore
| | - Thenapakiam Sathasivam
- Institute of Sustainability for Chemicals, Energy and Environment (ISCE2), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis #08-03, 138634, Singapore
| | - Ying Chuan Tan
- Institute of Sustainability for Chemicals, Energy and Environment (ISCE2), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis #08-03, 138634, Singapore
| | - Wenya Wu
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis #08-03, 138634, Singapore.
| | - Yihao Leow
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis #08-03, 138634, Singapore.
| | - Quentin Ray Tjieh Lim
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis #08-03, 138634, Singapore.
- Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, 117576, Singapore
| | - Pek Yin Michelle Yew
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis #08-03, 138634, Singapore.
- Institute of Sustainability for Chemicals, Energy and Environment (ISCE2), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis #08-03, 138634, Singapore
| | - Qiang Zhu
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis #08-03, 138634, Singapore.
- School of Chemistry, Chemical Engineering and Biotechnology, Nanyang Technological University, 62 Nanyang Dr, Singapore 637459
| | - Dan Kai
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis #08-03, 138634, Singapore.
- Institute of Sustainability for Chemicals, Energy and Environment (ISCE2), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis #08-03, 138634, Singapore
- School of Chemistry, Chemical Engineering and Biotechnology, Nanyang Technological University, 62 Nanyang Dr, Singapore 637459
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3
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Hu L, Chee PL, Sugiarto S, Yu Y, Shi C, Yan R, Yao Z, Shi X, Zhi J, Kai D, Yu HD, Huang W. Hydrogel-Based Flexible Electronics. Adv Mater 2023; 35:e2205326. [PMID: 36037508 DOI: 10.1002/adma.202205326] [Citation(s) in RCA: 48] [Impact Index Per Article: 48.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Revised: 08/09/2022] [Indexed: 06/15/2023]
Abstract
Flexible electronics is an emerging field of research involving multiple disciplines, which include but not limited to physics, chemistry, materials science, electronic engineering, and biology. However, the broad applications of flexible electronics are still restricted due to several limitations, including high Young's modulus, poor biocompatibility, and poor responsiveness. Innovative materials aiming for overcoming these drawbacks and boost its practical application is highly desirable. Hydrogel is a class of 3D crosslinked hydrated polymer networks, and its exceptional material properties render it as a promising candidate for the next generation of flexible electronics. Here, the latest methods of synthesizing advanced functional hydrogels and the state-of-art applications of hydrogel-based flexible electronics in various fields are reviewed. More importantly, the correlation between properties of the hydrogel and device performance is discussed here, to have better understanding of the development of flexible electronics by using environmentally responsive hydrogels. Last, perspectives on the current challenges and future directions in the development of hydrogel-based multifunctional flexible electronics are provided.
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Affiliation(s)
- Lixuan Hu
- Frontiers Science Center for Flexible Electronics, Xi'an Institute of Flexible Electronics (IFE) and Xi'an Institute of Biomedical Materials & Engineering, Northwestern Polytechnical University, 127 West Youyi Road, Xi'an, 710072, P. R. China
| | - Pei Lin Chee
- Institute of Materials Research and Engineering (IMRE), A∗STAR, 2 Fusionopolis Way, Innovis, No. 08-03, Singapore, 138634, Singapore
| | - Sigit Sugiarto
- Institute of Materials Research and Engineering (IMRE), A∗STAR, 2 Fusionopolis Way, Innovis, No. 08-03, Singapore, 138634, Singapore
| | - Yong Yu
- Institute of Materials Research and Engineering (IMRE), A∗STAR, 2 Fusionopolis Way, Innovis, No. 08-03, Singapore, 138634, Singapore
| | - Chuanqian Shi
- School of Aerospace Engineering and Applied Mechanics, Tongji University, Shanghai, 200092, P. R. China
| | - Ren Yan
- Frontiers Science Center for Flexible Electronics, Xi'an Institute of Flexible Electronics (IFE) and Xi'an Institute of Biomedical Materials & Engineering, Northwestern Polytechnical University, 127 West Youyi Road, Xi'an, 710072, P. R. China
| | - Zhuoqi Yao
- Frontiers Science Center for Flexible Electronics, Xi'an Institute of Flexible Electronics (IFE) and Xi'an Institute of Biomedical Materials & Engineering, Northwestern Polytechnical University, 127 West Youyi Road, Xi'an, 710072, P. R. China
| | - Xuewen Shi
- Frontiers Science Center for Flexible Electronics, Xi'an Institute of Flexible Electronics (IFE) and Xi'an Institute of Biomedical Materials & Engineering, Northwestern Polytechnical University, 127 West Youyi Road, Xi'an, 710072, P. R. China
| | - Jiacai Zhi
- Frontiers Science Center for Flexible Electronics, Xi'an Institute of Flexible Electronics (IFE) and Xi'an Institute of Biomedical Materials & Engineering, Northwestern Polytechnical University, 127 West Youyi Road, Xi'an, 710072, P. R. China
| | - Dan Kai
- Institute of Materials Research and Engineering (IMRE), A∗STAR, 2 Fusionopolis Way, Innovis, No. 08-03, Singapore, 138634, Singapore
- Institute of Sustainability for Chemicals, Energy and Environment (ISCE2), A∗STAR, 2 Fusionopolis Way, Innovis, No. 08-03, Singapore, 138634, Singapore
| | - Hai-Dong Yu
- Frontiers Science Center for Flexible Electronics, Xi'an Institute of Flexible Electronics (IFE) and Xi'an Institute of Biomedical Materials & Engineering, Northwestern Polytechnical University, 127 West Youyi Road, Xi'an, 710072, P. R. China
| | - Wei Huang
- Frontiers Science Center for Flexible Electronics, Xi'an Institute of Flexible Electronics (IFE) and Xi'an Institute of Biomedical Materials & Engineering, Northwestern Polytechnical University, 127 West Youyi Road, Xi'an, 710072, P. R. China
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4
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Yeung CWS, Periayah MH, Teo JYQ, Goh ETL, Chee PL, Loh WW, Loh XJ, Lakshminarayanan R, Lim JYC. Transforming Polyethylene into Water-Soluble Antifungal Polymers. Macromolecules 2023. [DOI: 10.1021/acs.macromol.2c01944] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Celine W. S. Yeung
- Agency for Science, Technology and Research (A*STAR), Institute of Materials Research and Engineering (IMRE), 2 Fusionopolis Way, Singapore 138634, Singapore
| | - Mercy Halleluyah Periayah
- Singapore Eye Research Institute (SERI), The Academia, 20 College Road, Level 6 Discovery Tower, Singapore 169856, Singapore
| | - Jerald Y. Q. Teo
- Agency for Science, Technology and Research (A*STAR), Institute of Materials Research and Engineering (IMRE), 2 Fusionopolis Way, Singapore 138634, Singapore
| | - Eunice Tze Leng Goh
- Singapore Eye Research Institute (SERI), The Academia, 20 College Road, Level 6 Discovery Tower, Singapore 169856, Singapore
| | - Pei Lin Chee
- Agency for Science, Technology and Research (A*STAR), Institute of Materials Research and Engineering (IMRE), 2 Fusionopolis Way, Singapore 138634, Singapore
| | - Wei Wei Loh
- Agency for Science, Technology and Research (A*STAR), Institute of Materials Research and Engineering (IMRE), 2 Fusionopolis Way, Singapore 138634, Singapore
| | - Xian Jun Loh
- Agency for Science, Technology and Research (A*STAR), Institute of Materials Research and Engineering (IMRE), 2 Fusionopolis Way, Singapore 138634, Singapore
- Department of Materials Science and Engineering, National University of Singapore (NUS), 9 Engineering Drive 1, Singapore 117576, Singapore
| | - Rajamani Lakshminarayanan
- Singapore Eye Research Institute (SERI), The Academia, 20 College Road, Level 6 Discovery Tower, Singapore 169856, Singapore
| | - Jason Y. C. Lim
- Agency for Science, Technology and Research (A*STAR), Institute of Materials Research and Engineering (IMRE), 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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5
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Hu Z, Cheng J, Xu S, Cheng X, Zhao J, Kenny Low ZW, Chee PL, Lu Z, Zheng L, Kai D. PVA/pectin composite hydrogels inducing osteogenesis for bone regeneration. Mater Today Bio 2022; 16:100431. [PMID: 36186849 PMCID: PMC9519593 DOI: 10.1016/j.mtbio.2022.100431] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2022] [Revised: 08/31/2022] [Accepted: 09/13/2022] [Indexed: 11/29/2022]
Abstract
Hydrogels composed from biomolecules have gained great interests as biomaterials for tissue engineering. However, their poor mechanical properties limit their application potential. Here, we synthesized a series of tough composite hydrogels from poly (vinyl alcohol) (PVA) and pectin for bone tissue engineering. With a balance of scaffold stiffness and pore size, PVA-Pec-10 hydrogel enhanced adhesion and proliferation of osteoblasts. The hydrogel significantly promoted osteogenesis in vitro by improving the alkaline phosphates (ALP) activity and calcium biomineralization, as well as upregulating the expressions of osteoblastic genes. The composite hydrogel also accelerated the bone healing process in vivo after transplantation into the femoral defect. Additionally, our study demonstrated that pectin and its Ca2+ crosslinking network play a crucial role of inducing osteogenesis through regulating the Ca2+/CaMKII and BMP-SMAD1/5 signaling. The optimized structure composition and multifunctional properties make PVA-Pec hydrogel highly promising to serve as a candidate for bone tissue regeneration. Recoverable PVA-Pec hydrogel is prepared by the freezing-thawing process. PVA-Pec-10 hydrogel display well attachment and osteogenesis capacity. PVA-Pecl-10 hydrogel enhanced osteogenesis by Ca2+/CaMKII and BMP-SMAD1/5 signaling.
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Affiliation(s)
- Ziwei Hu
- Guangxi Engineering Center in Biomedical Material for Tissue and Organ Regeneration, The First Affiliated Hospital of Guangxi Medical University, Nanning, 530021, China.,Collaborative Innovation Centre of Regenerative Medicine and Medical BioResource Development and Application Co-constructed By the Province and Ministry, The First Affiliated Hospital of Guangxi Medical University, Nanning, 530021, China.,Research Center for Regenerative Medicine, The First Affiliated Hospital of Guangxi Medical University, Nanning, 530021, China.,Guangxi Key Laboratory of Regenerative Medicine, The First Affiliated Hospital of Guangxi Medical University, Nanning, 530021, China
| | - Jianwen Cheng
- Guangxi Engineering Center in Biomedical Material for Tissue and Organ Regeneration, The First Affiliated Hospital of Guangxi Medical University, Nanning, 530021, China.,Collaborative Innovation Centre of Regenerative Medicine and Medical BioResource Development and Application Co-constructed By the Province and Ministry, The First Affiliated Hospital of Guangxi Medical University, Nanning, 530021, China.,Research Center for Regenerative Medicine, The First Affiliated Hospital of Guangxi Medical University, Nanning, 530021, China.,Guangxi Key Laboratory of Regenerative Medicine, The First Affiliated Hospital of Guangxi Medical University, Nanning, 530021, China.,Department of Orthopaedics Trauma and Hand Surgery, The First Affiliated Hospital of Guangxi Medical University, Nanning, 530021, China
| | - Sheng Xu
- Guangxi Engineering Center in Biomedical Material for Tissue and Organ Regeneration, The First Affiliated Hospital of Guangxi Medical University, Nanning, 530021, China.,Collaborative Innovation Centre of Regenerative Medicine and Medical BioResource Development and Application Co-constructed By the Province and Ministry, The First Affiliated Hospital of Guangxi Medical University, Nanning, 530021, China.,Research Center for Regenerative Medicine, The First Affiliated Hospital of Guangxi Medical University, Nanning, 530021, China.,Guangxi Key Laboratory of Regenerative Medicine, The First Affiliated Hospital of Guangxi Medical University, Nanning, 530021, China.,School of Basic Medical Sciences, Guangxi Medical University, Nanning, 530021, China
| | - Xiaojing Cheng
- Guangxi Engineering Center in Biomedical Material for Tissue and Organ Regeneration, The First Affiliated Hospital of Guangxi Medical University, Nanning, 530021, China.,Collaborative Innovation Centre of Regenerative Medicine and Medical BioResource Development and Application Co-constructed By the Province and Ministry, The First Affiliated Hospital of Guangxi Medical University, Nanning, 530021, China.,Research Center for Regenerative Medicine, The First Affiliated Hospital of Guangxi Medical University, Nanning, 530021, China.,Guangxi Key Laboratory of Regenerative Medicine, The First Affiliated Hospital of Guangxi Medical University, Nanning, 530021, China.,Life Science Institute, Guangxi Medical University, Nanning, 530021, China
| | - Jinmin Zhao
- Guangxi Engineering Center in Biomedical Material for Tissue and Organ Regeneration, The First Affiliated Hospital of Guangxi Medical University, Nanning, 530021, China.,Collaborative Innovation Centre of Regenerative Medicine and Medical BioResource Development and Application Co-constructed By the Province and Ministry, The First Affiliated Hospital of Guangxi Medical University, Nanning, 530021, China.,Research Center for Regenerative Medicine, The First Affiliated Hospital of Guangxi Medical University, Nanning, 530021, China.,Guangxi Key Laboratory of Regenerative Medicine, The First Affiliated Hospital of Guangxi Medical University, Nanning, 530021, China.,Department of Orthopaedics Trauma and Hand Surgery, The First Affiliated Hospital of Guangxi Medical University, Nanning, 530021, China
| | - Zhi Wei Kenny Low
- Institute of Materials Research and Engineering (IMRE), A∗STAR, 2 Fusionopolis Way, #08-03 Innovis, 138634, Singapore
| | - Pei Lin Chee
- Institute of Materials Research and Engineering (IMRE), A∗STAR, 2 Fusionopolis Way, #08-03 Innovis, 138634, Singapore
| | - Zhenhui Lu
- Guangxi Engineering Center in Biomedical Material for Tissue and Organ Regeneration, The First Affiliated Hospital of Guangxi Medical University, Nanning, 530021, China.,Collaborative Innovation Centre of Regenerative Medicine and Medical BioResource Development and Application Co-constructed By the Province and Ministry, The First Affiliated Hospital of Guangxi Medical University, Nanning, 530021, China.,Research Center for Regenerative Medicine, The First Affiliated Hospital of Guangxi Medical University, Nanning, 530021, China.,Guangxi Key Laboratory of Regenerative Medicine, The First Affiliated Hospital of Guangxi Medical University, Nanning, 530021, China
| | - Li Zheng
- Guangxi Engineering Center in Biomedical Material for Tissue and Organ Regeneration, The First Affiliated Hospital of Guangxi Medical University, Nanning, 530021, China.,Collaborative Innovation Centre of Regenerative Medicine and Medical BioResource Development and Application Co-constructed By the Province and Ministry, The First Affiliated Hospital of Guangxi Medical University, Nanning, 530021, China.,Research Center for Regenerative Medicine, The First Affiliated Hospital of Guangxi Medical University, Nanning, 530021, China.,Guangxi Key Laboratory of Regenerative Medicine, The First Affiliated Hospital of Guangxi Medical University, Nanning, 530021, China
| | - Dan Kai
- Institute of Materials Research and Engineering (IMRE), A∗STAR, 2 Fusionopolis Way, #08-03 Innovis, 138634, Singapore.,Institute of Sustainability for Chemicals, Energy and Environment (ISCE2), A∗STAR, 2 Fusionopolis Way, Innovis, #08-03, 138634, Singapore
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6
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Teo JYQ, Zheng XT, Seng DHL, Hui HK, Chee PL, Su X, Loh XJ, Lim JYC. Waste Polystyrene‐derived Sulfonated Fluorescent Carbon Nanoparticles for Cation Sensing. ChemistrySelect 2022. [DOI: 10.1002/slct.202202720] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Jerald Y. Q. Teo
- Institute of Materials Research and Engineering (IMRE) Agency for Science Technology and Research (A*STAR) 2 Fusionopolis Way, Innovis Singapore Singapore 136834
| | - Xin Ting Zheng
- Institute of Materials Research and Engineering (IMRE) Agency for Science Technology and Research (A*STAR) 2 Fusionopolis Way, Innovis Singapore Singapore 136834
| | - Debbie Hwee Leng Seng
- Institute of Materials Research and Engineering (IMRE) Agency for Science Technology and Research (A*STAR) 2 Fusionopolis Way, Innovis Singapore Singapore 136834
| | - Hui Kim Hui
- Institute of Materials Research and Engineering (IMRE) Agency for Science Technology and Research (A*STAR) 2 Fusionopolis Way, Innovis Singapore Singapore 136834
| | - Pei Lin Chee
- Institute of Materials Research and Engineering (IMRE) Agency for Science Technology and Research (A*STAR) 2 Fusionopolis Way, Innovis Singapore Singapore 136834
| | - Xiaodi Su
- Institute of Materials Research and Engineering (IMRE) Agency for Science Technology and Research (A*STAR) 2 Fusionopolis Way, Innovis Singapore Singapore 136834
| | - Xian Jun Loh
- Institute of Materials Research and Engineering (IMRE) Agency for Science Technology and Research (A*STAR) 2 Fusionopolis Way, Innovis Singapore Singapore 136834
- Prof. Dr. JYC Lim Department of Materials Science and Engineering National University of Singapore (NUS) 9 Engineering Drive 1 Singapore Singapore 117576
| | - Jason Y. C. Lim
- Institute of Materials Research and Engineering (IMRE) Agency for Science Technology and Research (A*STAR) 2 Fusionopolis Way, Innovis Singapore Singapore 136834
- Prof. Dr. JYC Lim Department of Materials Science and Engineering National University of Singapore (NUS) 9 Engineering Drive 1 Singapore Singapore 117576
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7
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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] [What about the content of this article? (0)] [Affiliation(s)] [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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8
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Chee PL, Sugiarto S, Yu Y, Tan YC, Ye E, Kai D, Loh XJ. Antioxidative and Anti‐UV Lignin Carrier for Peptide Delivery. MACROMOL CHEM PHYS 2021. [DOI: 10.1002/macp.202100364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Pei Lin Chee
- Institute of Materials Research and Engineering (IMRE) A*STAR 2 Fusionopolis Way, #08‐03 Innovis Singapore 138634 Singapore
| | - Sigit Sugiarto
- Institute of Materials Research and Engineering (IMRE) A*STAR 2 Fusionopolis Way, #08‐03 Innovis Singapore 138634 Singapore
| | - Yong Yu
- Institute of Materials Research and Engineering (IMRE) A*STAR 2 Fusionopolis Way, #08‐03 Innovis Singapore 138634 Singapore
| | - Ying Chuan Tan
- Institute of Materials Research and Engineering (IMRE) A*STAR 2 Fusionopolis Way, #08‐03 Innovis Singapore 138634 Singapore
| | - Enyi Ye
- Institute of Materials Research and Engineering (IMRE) A*STAR 2 Fusionopolis Way, #08‐03 Innovis Singapore 138634 Singapore
| | - Dan Kai
- Institute of Materials Research and Engineering (IMRE) A*STAR 2 Fusionopolis Way, #08‐03 Innovis Singapore 138634 Singapore
| | - Xian Jun Loh
- Institute of Materials Research and Engineering (IMRE) A*STAR 2 Fusionopolis Way, #08‐03 Innovis Singapore 138634 Singapore
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9
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Chee PL, Owh C, Venkatesh M, Periayah MH, Zhang Z, Michelle Yew PY, Ruan H, Lakshminarayanan R, Kai D, Loh XJ. Cationic Lignin-Based Hyperbranched Polymers to Circumvent Drug Resistance in Pseudomonas Keratitis. ACS Biomater Sci Eng 2021; 7:4659-4668. [PMID: 34414768 DOI: 10.1021/acsbiomaterials.1c00856] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The rise of antimicrobial-resistant bacteria strains has been a global public health concern due to their ability to cause increased patient morbidity and a greater burden on the healthcare system. As one of the potential solutions to overcome such bacterial infections, hyperbranched copolymers with cationic charges were developed. These copolymers were assessed for their antimicrobial efficacy and their bactericidal mechanisms. They were found to be potent against mobile colistin-resistant 1 strains, which was significant as colistin is known to be the last-resort antibiotic against Gram-negative bacteria. Furthermore, there was no sign of mutational resistance developed by E. Coli ATCC 25922 and MCR 1+ E. Coli against the copolymer even up to 20 passages. The ability to evade inducing resistance would provide invaluable insights for future antibiotic development. Our studies suggest that the bactericidal efficacy comes from the ability to target the outer membrane efficaciously. In vivo study using a Pseudomonas keratitis model showed that the copolymer was compatible with the eye and further supported that the copolymer treatment was effective for complete bacteria elimination.
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Affiliation(s)
- Pei Lin Chee
- Institute of Materials Research and Engineering (IMRE), A*STAR, 2 Fusionopolis Way, #08-03 Innovis, Singapore 138634, Singapore
| | - Cally Owh
- Institute of Materials Research and Engineering (IMRE), A*STAR, 2 Fusionopolis Way, #08-03 Innovis, Singapore 138634, Singapore
| | - Mayandi Venkatesh
- Ocular Infections & Anti-Microbials Research Group, Singapore Eye Research Institute, The Academia, 20 College Road, Discovery Tower, Singapore 169856, Singapore
| | - Mercy Halleluyah Periayah
- Ocular Infections & Anti-Microbials Research Group, Singapore Eye Research Institute, The Academia, 20 College Road, Discovery Tower, Singapore 169856, Singapore
| | - Zheng Zhang
- Institute of Materials Research and Engineering (IMRE), A*STAR, 2 Fusionopolis Way, #08-03 Innovis, Singapore 138634, Singapore
| | - Pek Yin Michelle Yew
- Institute of Materials Research and Engineering (IMRE), A*STAR, 2 Fusionopolis Way, #08-03 Innovis, Singapore 138634, Singapore
| | - Huajun Ruan
- Zhejiang Fenix Health Science and Technology Co., Ltd, Zhejiang 176849, China
| | - Rajamani Lakshminarayanan
- Ocular Infections & Anti-Microbials Research Group, Singapore Eye Research Institute, The Academia, 20 College Road, Discovery Tower, Singapore 169856, Singapore.,Department of Pharmacy, National University of Singapore, 18 Science Drive, Singapore 117543, Singapore.,Ophthalmology and Visual Sciences Academic Clinical Program, Duke-NUS Graduate Medical School, Singapore 169857, Singapore
| | - Dan Kai
- Institute of Materials Research and Engineering (IMRE), A*STAR, 2 Fusionopolis Way, #08-03 Innovis, Singapore 138634, Singapore
| | - Xian Jun Loh
- Institute of Materials Research and Engineering (IMRE), A*STAR, 2 Fusionopolis Way, #08-03 Innovis, Singapore 138634, Singapore
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10
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Jiang L, Chee PL, Gao J, Gan CRR, Owh C, Lakshminarayanan R, Jiang S, Hor TSA, Loh XJ. A New Potent Antimicrobial Metalloporphyrin. Chem Asian J 2021; 16:1007-1015. [PMID: 33617127 DOI: 10.1002/asia.202100053] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Revised: 02/19/2021] [Indexed: 11/06/2022]
Abstract
A series of bis-acryl functionalized porphyrins and their corresponding metalloporphyrins (M=Co, Mn) were synthesized and investigated for their antimicrobial properties through MIC screening and bacteria time-kill kinetic studies. The Mn(III) 4-(bis)methylphenyl-substituted-porphyrins showed superior batericidal activities even in the dark with low hemotoxicity and good cytotoxicity profile.
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Affiliation(s)
- Lu Jiang
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research, 2 Fusionopolis Way, #08-03, Innovis, Singapore, 138634, Singapore
| | - Pei Lin Chee
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research, 2 Fusionopolis Way, #08-03, Innovis, Singapore, 138634, Singapore
| | - Jian Gao
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore
| | - Ching Ruey Raymond Gan
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore
| | - Cally Owh
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research, 2 Fusionopolis Way, #08-03, Innovis, Singapore, 138634, Singapore
| | - Rajamani Lakshminarayanan
- Anti-Infectives Research Group, Singapore Eye Research Institute, Singapore, 169856, Singapore.,Ophthalmology and Visual Sciences Academic Clinical Program, Duke-NUS Medical School, Singapore, 169857, Singapore.,Department of Pharmacy, National University of Singapore, Singapore, 117543, Singapore
| | - Shan Jiang
- College of Chemistry, Jilin University, Changchun, 130012, P. R. China
| | - T S Andy Hor
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore.,Agency for Science, Technology and Research, 1, #20-10 Fusionopolis Way, Connexis, North Tower, Singapore, 138632, Singapore
| | - Xian Jun Loh
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research, 2 Fusionopolis Way, #08-03, Innovis, Singapore, 138634, Singapore.,Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore, 117576, Singapore
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11
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Leow Y, Yew PYM, Chee PL, Loh XJ, Kai D. Recycling of spent coffee grounds for useful extracts and green composites. RSC Adv 2021; 11:2682-2692. [PMID: 35424216 PMCID: PMC8693820 DOI: 10.1039/d0ra09379c] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Accepted: 12/14/2020] [Indexed: 11/25/2022] Open
Abstract
Large amounts of spent coffee grounds (SCGs) are often discarded and there is a need to find alternative disposal methods due to environmental concerns. This project aims to develop sustainable materials by re-purposing spent coffee grounds (SCGs). Oil extraction was performed using different organic solvents and yielded approximately 10% coffee oil. Coffee oil contains potentially useful chemical compounds such as fatty acids and caffeine. They also exhibited antioxidant properties. Extracted SCGs (ESCGs) were blended with epoxy resin to form composites. ESCG composites displayed a general decrease in mechanical properties relative to epoxy. However, improvements were observed when comparing ESCG composites and SCG composites. The greatest improvement belongs to epoxy composite filled with acetone-ESCGs, where the tensile strength, flexural modulus and flexural strength increased to 23.4 MPa, 3.02 GPa and 42.9 MPa respectively. This study presents a way to exploit waste materials which contributes to the goal of sustainability. Spent coffee grounds are mostly discarded as waste. Here we recycle them for chemical compounds and as composite material fillers. Our study evaluated the chemical composition of coffee oil extracts and mechanical properties of composites formed.![]()
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Affiliation(s)
- Yihao Leow
- Institute of Materials Research and Engineering (IMRE), ASTAR 2 Fusionopolis Way, #08-03 Innovis 138634 Singapore .,Department of Materials Science and Engineering, National University of Singapore 9 Engineering Drive 1 117576 Singapore
| | - Pek Yin Michelle Yew
- Institute of Materials Research and Engineering (IMRE), ASTAR 2 Fusionopolis Way, #08-03 Innovis 138634 Singapore
| | - Pei Lin Chee
- Institute of Materials Research and Engineering (IMRE), ASTAR 2 Fusionopolis Way, #08-03 Innovis 138634 Singapore
| | - Xian Jun Loh
- Institute of Materials Research and Engineering (IMRE), ASTAR 2 Fusionopolis Way, #08-03 Innovis 138634 Singapore
| | - Dan Kai
- Institute of Materials Research and Engineering (IMRE), ASTAR 2 Fusionopolis Way, #08-03 Innovis 138634 Singapore
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12
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Abstract
The skin is a "smart", multifunctional organ that is protective, self-healing and capable of sensing and many forms of artificial skins have been developed with properties and functionalities approximating those of natural skin. Starting from specific commercial products for the treatment of burns, progress in two fields of research has since allowed these remarkable materials to be viable skin replacements for a wide range of dermatological conditions. This review maps out the development of bioengineered skin replacements and synthetic skin substitutes, including electronic skins. The specific behaviors of these skins are highlighted, and the performances of both types of artificial skins are evaluated against this. Moving beyond mere replication, highly advanced artificial skin materials are also identified as potential augmented skins that can be used as flexible electronics for health-care monitoring and other applications.
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Affiliation(s)
- Zhi Wei Kenny Low
- Institute of Materials Research and Engineering, A*STAR, 2Fusionopolis Way, Innovis, #08-03, Singapore 138634.
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13
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Lin Q, Lim JYC, Xue K, Yew PYM, Owh C, Chee PL, Loh XJ. Back Cover: Sanitizing agents for virus inactivation and disinfection (View 2/2020). View 2020. [DOI: 10.1002/viw2.31] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
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14
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Lin Q, Lim JYC, Xue K, Yew PYM, Owh C, Chee PL, Loh XJ. Sanitizing agents for virus inactivation and disinfection. View (Beijing) 2020; 1:e16. [PMID: 34766164 PMCID: PMC7267133 DOI: 10.1002/viw2.16] [Citation(s) in RCA: 93] [Impact Index Per Article: 23.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2020] [Revised: 04/02/2020] [Accepted: 04/05/2020] [Indexed: 01/19/2023] Open
Abstract
Viral epidemics develop from the emergence of new variants of infectious viruses. The lack of effective antiviral treatments for the new viral infections coupled with rapid community spread of the infection often result in major human and financial loss. Viral transmissions can occur via close human-to-human contact or via contacting a contaminated surface. Thus, careful disinfection or sanitization is essential to curtail viral spread. A myriad of disinfectants/sanitizing agents/biocidal agents are available that can inactivate viruses, but their effectiveness is dependent upon many factors such as concentration of agent, reaction time, temperature, and organic load. In this work, we review common commercially available disinfectants agents available on the market and evaluate their effectiveness under various application conditions. In addition, this work also seeks to debunk common myths about viral inactivation and highlight new exciting advances in the development of potential sanitizing agents.
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Affiliation(s)
- Qianyu Lin
- NUS Graduate School for Integrative Sciences and EngineeringNational University of SingaporeSingapore
| | - Jason Y. C. Lim
- Soft Materials DepartmentInstitution of Materials Research and EngineeringAgency for ScienceTechnology and Research (A*STAR)InnovisSingapore
| | - Kun Xue
- Soft Materials DepartmentInstitution of Materials Research and EngineeringAgency for ScienceTechnology and Research (A*STAR)InnovisSingapore
| | - Pek Yin Michelle Yew
- Soft Materials DepartmentInstitution of Materials Research and EngineeringAgency for ScienceTechnology and Research (A*STAR)InnovisSingapore
| | - Cally Owh
- Soft Materials DepartmentInstitution of Materials Research and EngineeringAgency for ScienceTechnology and Research (A*STAR)InnovisSingapore
| | - Pei Lin Chee
- Soft Materials DepartmentInstitution of Materials Research and EngineeringAgency for ScienceTechnology and Research (A*STAR)InnovisSingapore
| | - Xian Jun Loh
- Soft Materials DepartmentInstitution of Materials Research and EngineeringAgency for ScienceTechnology and Research (A*STAR)InnovisSingapore
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15
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Low ZWK, Li Z, Owh C, Chee PL, Ye E, Kai D, Yang DP, Loh XJ. Using Artificial Skin Devices as Skin Replacements: Insights into Superficial Treatment. Small 2019; 15:e1805453. [PMID: 30690897 DOI: 10.1002/smll.201805453] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Indexed: 06/09/2023]
Abstract
Artificial skin devices are able to mimic the flexibility and sensory perception abilities of the skin. They have thus garnered attention in the biomedical field as potential skin replacements. This Review delves into issues pertaining to these skin-deep devices. It first elaborates on the roles that these devices have to fulfill as skin replacements, and identify strategies that are used to achieve such functionality. Following which, a comparison is done between the current state of these skin-deep devices and that of natural skin. Finally, an outlook on artificial skin devices is presented, which discusses how complementary technologies can create skin enhancements, and what challenges face such devices.
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Affiliation(s)
- Zhi Wei Kenny Low
- Institute of Materials Research and Engineering, 2 Fusionopolis Way, Innovis, #08-03, Singapore, 138634, Singapore
- Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore, 117576, Singapore
| | - Zibiao Li
- Institute of Materials Research and Engineering, 2 Fusionopolis Way, Innovis, #08-03, Singapore, 138634, Singapore
| | - Cally Owh
- Institute of Materials Research and Engineering, 2 Fusionopolis Way, Innovis, #08-03, Singapore, 138634, Singapore
- Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore, 117576, Singapore
| | - Pei Lin Chee
- Institute of Materials Research and Engineering, 2 Fusionopolis Way, Innovis, #08-03, Singapore, 138634, Singapore
- Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore, 117576, Singapore
| | - Enyi Ye
- Institute of Materials Research and Engineering, 2 Fusionopolis Way, Innovis, #08-03, Singapore, 138634, Singapore
| | - Dan Kai
- Institute of Materials Research and Engineering, 2 Fusionopolis Way, Innovis, #08-03, Singapore, 138634, Singapore
| | - Da-Peng Yang
- College of Chemical Engineering and Materials Science, Quanzhou Normal University, Quanzhou, 362000, Fujian Province, China
| | - Xian Jun Loh
- Institute of Materials Research and Engineering, 2 Fusionopolis Way, Innovis, #08-03, Singapore, 138634, Singapore
- Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore, 117576, Singapore
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16
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Liow SS, Chee PL, Owh C, Zhang K, Zhou Y, Gao F, Lakshminarayanan R, Loh XJ. Cationic Poly([R]-3-hydroxybutyrate) Copolymers as Antimicrobial Agents. Macromol Biosci 2019; 19:e1800466. [PMID: 30694604 DOI: 10.1002/mabi.201800466] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Revised: 12/29/2018] [Indexed: 12/14/2022]
Abstract
Poly([R]-3-hydroxybutyrate) (PHB), a natural biodegradable polyester, has attracted much attention as a new biomaterial because of its sustainability and good biocompatibility. In this study, it is discovered that PHB can be conveniently functionalized to obtain a number of platform chain architectures that may provide a wide range of functional copolymers. In a transesterification reaction, linear (di-hydroxylated) and star shaped (tri- and tetra-hydroxylated) PHB oligomers are synthesized, followed by copolymerization with 2-(dimethylamino)ethyl methacrylate and quaternization with benzyl bromide to afford antimicrobial properties. The antimicrobial activities of the quaternary salts against clinically relevant pathogens on the interactions with outer and cytoplasmic membranes, lethal mechanisms, multipassage resistance, and synergy effect with antibiotics are investigated. Cationic PHB copolymers show effectiveness as antimicrobial agents, with minimum inhibitory concentration values 0.24-0.65 µm (or µmol dm-3 ) (or 32-128 µg mL-1 ) against Gram-positive and Gram-negative bacteria. Modifying the copolymer architectures into star shapes results in enhanced effectiveness to disrupt the membrane integrity. Synergistic effects are attained for all the quaternized PHB derivatives when they are used together with tobramycin. Multipassage resistance does not occur in both the linear and star derivatives against Gram-negative bacteria after 20 passages.
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Affiliation(s)
- Sing Shy Liow
- Institute of Materials Research and Engineering, 2 Fusionopolis Way, #08-03 Innovis, Singapore, 138634
| | - Pei Lin Chee
- Institute of Materials Research and Engineering, 2 Fusionopolis Way, #08-03 Innovis, Singapore, 138634
| | - Cally Owh
- Institute of Materials Research and Engineering, 2 Fusionopolis Way, #08-03 Innovis, Singapore, 138634
| | - Kangyi Zhang
- Institute of Materials Research and Engineering, 2 Fusionopolis Way, #08-03 Innovis, Singapore, 138634
| | - Yubin Zhou
- School of Materials Science and Engineering, College of Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798.,Department of Physiology, and Immunology Programme, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, 117456
| | - Feng Gao
- School of Materials Science and Engineering, College of Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798.,Key laboratory of Carbon Fiber and Functional Polymer, Ministry of Education, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
| | | | - Xian Jun Loh
- Institute of Materials Research and Engineering, 2 Fusionopolis Way, #08-03 Innovis, Singapore, 138634
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17
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Abstract
The programmable nature of supramolecular interactions enables various supramolecular hydrogels to perform antimicrobial therapy.
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Affiliation(s)
- Benhui Hu
- Innovative Center for Flexible Devices (iFLEX)
- School of Materials Science and Engineering
- Nanyang Technological University
- Singapore 639798
- Singapore
| | - Cally Owh
- Institute of Materials Research and Engineering (IMRE)
- Singapore
| | - Pei Lin Chee
- Institute of Materials Research and Engineering (IMRE)
- Singapore
| | - Wan Ru Leow
- Innovative Center for Flexible Devices (iFLEX)
- School of Materials Science and Engineering
- Nanyang Technological University
- Singapore 639798
- Singapore
| | - Xuan Liu
- Fujian Provincial Key Laboratory of Innovative Drug Target Research
- School of Pharmaceutical Science
- Xiamen University
- Xiamen
- China
| | - Yun-Long Wu
- Fujian Provincial Key Laboratory of Innovative Drug Target Research
- School of Pharmaceutical Science
- Xiamen University
- Xiamen
- China
| | - Peizhi Guo
- Institute of Materials for Energy and Environment
- School of Materials Science and Engineering
- Qingdao University
- Qingdao
- China
| | - Xian Jun Loh
- Institute of Materials Research and Engineering (IMRE)
- Singapore
| | - Xiaodong Chen
- Innovative Center for Flexible Devices (iFLEX)
- School of Materials Science and Engineering
- Nanyang Technological University
- Singapore 639798
- Singapore
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18
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Abdul Karim A, Chee PL, Chan MF, Loh XJ. Micellized α-Cyclodextrin-Based Supramolecular Hydrogel Exhibiting pH-Responsive Sustained Release and Corresponding Oscillatory Shear Behavior Analysis. ACS Biomater Sci Eng 2016; 2:2185-2195. [DOI: 10.1021/acsbiomaterials.6b00383] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Anis Abdul Karim
- Institute
of Materials Research and Engineering (IMRE), A*STAR (Agency for Science, Technology and Research), 2 Fusionopolis Way, Innovis, Singapore 138634
| | - Pei Lin Chee
- Institute
of Materials Research and Engineering (IMRE), A*STAR (Agency for Science, Technology and Research), 2 Fusionopolis Way, Innovis, Singapore 138634
| | - Meng Fai Chan
- Department of Materials Science
and Engineering, National University of Singapore, 9 Engineering
Drive 1, Singapore 117576, Singapore
| | - Xian Jun Loh
- Institute
of Materials Research and Engineering (IMRE), A*STAR (Agency for Science, Technology and Research), 2 Fusionopolis Way, Innovis, Singapore 138634
- Department of Materials Science
and Engineering, National University of Singapore, 9 Engineering
Drive 1, Singapore 117576, Singapore
- Singapore Eye Research Institute, 11 Third Hospital Avenue, Singapore 168751, Singapore
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19
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Abstract
Further developing on the technique originally intended for the purpose of forming tough hydrogels, we showed in this study that the double-network system can also be used to synthesize an injectable gel. The gel was made up of poly(ethylene glycol) methyl ether methacrylate, sodium alginic acid, and calcium chloride, and two networks, consisting of ionic and covalent networks, were found to co-exist in the gel. Additionally, the rheology studies showed that the mechanical properties of the gel only deteriorated under high strain, demonstrating the robustness of the gel upon injection. The results of a cell cytotoxicity test and a preliminary cell encapsulation study were promising, showing good cell compatibility and thus suggesting that the hydrogels could potentially be used for cell delivery.
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20
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Li Z, Chee PL, Owh C, Lakshminarayanan R, Loh XJ. Safe and efficient membrane permeabilizing polymers based on PLLA for antibacterial applications. RSC Adv 2016. [DOI: 10.1039/c6ra04531f] [Citation(s) in RCA: 78] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Highly active antibacterial poly(N,N-dimethylaminoethyl methacrylate)-block-poly(l-lactic acid)-block-poly(N,N-dimethylaminoethyl methacrylate) conjugated with poly(ethylene glycol) (D-PLLA-D@PEG) copolymers were synthesized.
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Affiliation(s)
- Zibiao Li
- Institute of Materials Research and Engineering
- A*STAR (Agency for Science Technology and Research)
- Singapore 138634
- Singapore
| | - Pei Lin Chee
- Institute of Materials Research and Engineering
- A*STAR (Agency for Science Technology and Research)
- Singapore 138634
- Singapore
| | - Cally Owh
- Institute of Materials Research and Engineering
- A*STAR (Agency for Science Technology and Research)
- Singapore 138634
- Singapore
| | | | - Xian Jun Loh
- Institute of Materials Research and Engineering
- A*STAR (Agency for Science Technology and Research)
- Singapore 138634
- Singapore
- Department of Materials Science and Engineering
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21
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Low ZW, Chee PL, Kai D, Loh XJ. The role of hydrogen bonding in alginate/poly(acrylamide-co-dimethylacrylamide) and alginate/poly(ethylene glycol) methyl ether methacrylate-based tough hybrid hydrogels. RSC Adv 2015. [DOI: 10.1039/c5ra09926a] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Hybrid hydrogels, with an elastic modulus and compressive toughness of 350 kPa and 70 J m−3, was synthesized and reported here.
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Affiliation(s)
- Zhi Wei Low
- Institute of Materials Research and Engineering (IMRE)
- A*STAR
- Singapore 117602
- Singapore
- Department of Materials Science and Engineering
| | - Pei Lin Chee
- Institute of Materials Research and Engineering (IMRE)
- A*STAR
- Singapore 117602
- Singapore
| | - Dan Kai
- Institute of Materials Research and Engineering (IMRE)
- A*STAR
- Singapore 117602
- Singapore
| | - Xian Jun Loh
- Institute of Materials Research and Engineering (IMRE)
- A*STAR
- Singapore 117602
- Singapore
- Department of Materials Science and Engineering
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22
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Abstract
Dual-functionality carbon dots with both anti-microbial and gene transfection abilities were developed and their properties elaborated in this paper.
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Affiliation(s)
- Qingqing Dou
- Institute of Materials Research and Engineering
- A*STAR, (Agency for Science, Technology and Research)
- Singapore 117602
- Singapore
| | - Xiaotian Fang
- Institute of Materials Research and Engineering
- A*STAR, (Agency for Science, Technology and Research)
- Singapore 117602
- Singapore
| | - Shan Jiang
- Institute of Materials Research and Engineering
- A*STAR, (Agency for Science, Technology and Research)
- Singapore 117602
- Singapore
| | - Pei Lin Chee
- Institute of Materials Research and Engineering
- A*STAR, (Agency for Science, Technology and Research)
- Singapore 117602
- Singapore
| | - Tung-Chun Lee
- Institute for Materials Discovery
- University College London
- WC1E 6BT London
- UK
| | - Xian Jun Loh
- Institute of Materials Research and Engineering
- A*STAR, (Agency for Science, Technology and Research)
- Singapore 117602
- Singapore
- Department of Materials Science and Engineering
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