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Kohsaka Y, Toyama K, Kawauchi M, Naganuma K. Fast and Selective Main-Chain Scission of Vinyl Polymers Using the Domino Reaction in the Alternating Sequence for Transesterification. ACS Macro Lett 2024; 13:1016-1021. [PMID: 39058303 DOI: 10.1021/acsmacrolett.4c00295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/28/2024]
Abstract
This communication reports on vinyl polymers capable of selective and fast main-chain scission (MCS). The trick is the domino reaction in an alternating sequence of methyl 2-(trimethylsiloxymethyl)acrylate and 5,6-benzo-2-methylene-1,3-dioxepane, a cyclic ketene acetal for radical ring-opening polymerization. Removal of the trimethylsilyl group using Bu4N+·F- readily led to MCS via irreversible transesterification of the ester backbone, affording a five-membered lactone fragment. The molar mass decreased drastically within 5 min, and no side reactions were observed. Control experiments suggest that the formation of a five-membered ring via a domino reaction is critical for fast and selective MCS. The terpolymers with methyl methacrylate and styrene also exhibited a large decrease in molar mass within 5 min. In addition, MCS was also observed for the heterogeneous reaction system in acidic aqueous media; treatment of the binary copolymer in a 50 wt % acetic acid solution resulted in a significant decrease in molar mass after 30 min. These results suggest efficient construction of degradable sites using a binary monomer system corresponding to the pendant trigger and ester backbone. Because this molecular design using a binary monomer system provides selective and fast MCS for terpolymers containing other vinyl monomers, it can provide various degradable vinyl polymers.
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Affiliation(s)
- Yasuhiro Kohsaka
- Research Initiative for Supra-Materials, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, 4-17-1 Wakasato, Nagano, Nagano 380-8553, Japan
- Faculty of Textile Science and Technology, Shinshu University, 3-15-1 Tokida, Ueda, Nagano 386-8567, Japan
| | - Kaho Toyama
- Faculty of Textile Science and Technology, Shinshu University, 3-15-1 Tokida, Ueda, Nagano 386-8567, Japan
| | - Moe Kawauchi
- Faculty of Textile Science and Technology, Shinshu University, 3-15-1 Tokida, Ueda, Nagano 386-8567, Japan
| | - Koki Naganuma
- Faculty of Textile Science and Technology, Shinshu University, 3-15-1 Tokida, Ueda, Nagano 386-8567, Japan
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Kawatani R, Hagiwara K, Tanaka A, Kohsaka Y. Polythioethers bearing side groups for efficient degradation by E1cB reaction: reaction design for polymerization and main-chain scission. RSC Adv 2023; 13:20782-20786. [PMID: 37435381 PMCID: PMC10332248 DOI: 10.1039/d3ra03751g] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Accepted: 06/23/2023] [Indexed: 07/13/2023] Open
Abstract
We have previously reported the polycondensation by the tandem reactions of dithiols and α-(bromomethyl)acrylates, consisting of conjugate substitution (SN2' reaction) and conjugate addition (Michael addition) reactions. The resulting polythioethers underwent a main-chain scission (MCS) by E1cB reaction, which is the reverse reaction of conjugate addition, although it was not quantitative due to the equilibrium. Herein, the modification of the structures of polythioethers led to irreversible MCS, whereby the β-positions of ester moieties were substituted with a phenyl group. This slight modification in the polymer structure influenced the monomer structures and polymerization mechanisms. The understanding of reaction mechanisms by model reactions was required to obtain high molecular weights of polythioethers. It was clarified that the consequent additions of 1,4-diazabicyclo[2.2.2]octane (DABCO), 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU), and PBu3 were effective to achieve high molecular weight. The resulting polythioethers decomposed by irreversible MCS via E1cB reaction with DBU.
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Affiliation(s)
- Ryo Kawatani
- Faculty of Textile Science and Technology, Shinshu University 3-15-1 Tokida Ueda Nagano 386-8567 Japan
| | - Keito Hagiwara
- Faculty of Textile Science and Technology, Shinshu University 3-15-1 Tokida Ueda Nagano 386-8567 Japan
| | - Anri Tanaka
- Faculty of Textile Science and Technology, Shinshu University 3-15-1 Tokida Ueda Nagano 386-8567 Japan
| | - Yasuhiro Kohsaka
- Faculty of Textile Science and Technology, Shinshu University 3-15-1 Tokida Ueda Nagano 386-8567 Japan
- Research Initiative for Supra-Materials (RISM), Interdisciplinary Cluster for Cutting Edge Research (ICCER), Shinshu University 4-17-1 Wakasato Nagano City Nagano 380-8553 Japan
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Liu M, Huang Y, Tao C, Yang W, Chen J, Zhu L, Pan T, Narain R, Nan K, Chen Y. Self-Healing Alginate Hydrogel Formed by Dynamic Benzoxaborolate Chemistry Protects Retinal Pigment Epithelium Cells against Oxidative Damage. Gels 2022; 9:gels9010024. [PMID: 36661792 PMCID: PMC9857501 DOI: 10.3390/gels9010024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Revised: 12/16/2022] [Accepted: 12/20/2022] [Indexed: 12/31/2022] Open
Abstract
Oxidative stress is considered as a major factor causing retinal pigment epithelium (RPE) dysfunction and finally leading to retinal diseases such as age-related macular degeneration (AMD). Developing hydrogels for RPE cell delivery, especially those with antioxidant feature, is emerging as a promising approach for AMD treatment. Herein, a readily prepared antioxidant alginate-based hydrogel was developed to serve as a cytoprotective agent for RPE cells against oxidative damage. Alg-BOB was synthesized via conjugation of benzoxaborole (BOB) to the polysaccharide backbone. Hydrogels were formed through self-crosslinking of Alg-BOB based on benzoxaborole-diol complexation. The resulting hydrogel showed porous micro-structure, pH dependent mechanical strength and excellent self-healing, remolding, and injectable properties. Moreover, the hydrogel exhibited excellent cytocompatibility and could efficiently scavenge reactive oxygen species (ROS) to achieve an enhanced viability of ARPE-19 cells under oxidative condition. Altogether, our study reveals that the antioxidant Alg-BOB hydrogel represents an eligible candidate for RPE delivery and AMD treatment.
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Affiliation(s)
- Minhua Liu
- State Key Laboratory of Ophthalmology, Optometry and Vision Science, School of Ophthalmology & Optometry, Wenzhou Medical University, Wenzhou 325027, China
| | - Yate Huang
- State Key Laboratory of Ophthalmology, Optometry and Vision Science, School of Ophthalmology & Optometry, Wenzhou Medical University, Wenzhou 325027, China
| | - Chunwen Tao
- State Key Laboratory of Ophthalmology, Optometry and Vision Science, School of Ophthalmology & Optometry, Wenzhou Medical University, Wenzhou 325027, China
| | - Weijia Yang
- State Key Laboratory of Ophthalmology, Optometry and Vision Science, School of Ophthalmology & Optometry, Wenzhou Medical University, Wenzhou 325027, China
| | - Junrong Chen
- State Key Laboratory of Ophthalmology, Optometry and Vision Science, School of Ophthalmology & Optometry, Wenzhou Medical University, Wenzhou 325027, China
| | - Li Zhu
- State Key Laboratory of Ophthalmology, Optometry and Vision Science, School of Ophthalmology & Optometry, Wenzhou Medical University, Wenzhou 325027, China
| | - Tonghe Pan
- State Key Laboratory of Ophthalmology, Optometry and Vision Science, School of Ophthalmology & Optometry, Wenzhou Medical University, Wenzhou 325027, China
| | - Ravin Narain
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 2G6, Canada
- Correspondence: (R.N.); (K.N.); (Y.C.)
| | - Kaihui Nan
- State Key Laboratory of Ophthalmology, Optometry and Vision Science, School of Ophthalmology & Optometry, Wenzhou Medical University, Wenzhou 325027, China
- National Engineering Research Center of Ophthalmology and Optometry, School of Biomedical Engineering, Wenzhou Medical University, Wenzhou 325027, China
- National Clinical Research Center for Ocular Diseases, Affiliated Eye Hospital of Wenzhou Medical University, Wenzhou 325027, China
- Correspondence: (R.N.); (K.N.); (Y.C.)
| | - Yangjun Chen
- State Key Laboratory of Ophthalmology, Optometry and Vision Science, School of Ophthalmology & Optometry, Wenzhou Medical University, Wenzhou 325027, China
- National Engineering Research Center of Ophthalmology and Optometry, School of Biomedical Engineering, Wenzhou Medical University, Wenzhou 325027, China
- National Clinical Research Center for Ocular Diseases, Affiliated Eye Hospital of Wenzhou Medical University, Wenzhou 325027, China
- Correspondence: (R.N.); (K.N.); (Y.C.)
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Kobayashi D, Uchida H, Ishibane M, Kurita E, Kirihara M, Kotsuchibashi Y. Fabrication of thermally cross-linked poly(methacrylic acid)-based sponges with nanolayered structures and their degradation. Polym J 2022. [DOI: 10.1038/s41428-022-00721-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Fujimoto K, Saito A, Kotsuchibashi Y. Cicada-Wing-Inspired Nanopillar Hydrogels Consisting of Poly(vinyl alcohol) and Poly(methacrylic acid) for Capturing Bacteria through Their Flexibility and Wide Range of Motion. ACS Macro Lett 2022; 11:727-732. [PMID: 35579174 DOI: 10.1021/acsmacrolett.2c00126] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The human race has learned about countering bacterial infection from other living organisms. In this study, cicada-wing-inspired hydrophilic nanopillars were prepared using commercially available porous alumina templates without the use of specialized equipment and additional materials. Hydrophilic polymers of poly(vinyl alcohol) (PVA) and poly(methacrylic acid) (poly(MAAc)) were used to construct these nanopillars. The water-insoluble nanopillars formed by thermal cross-linking between the hydroxy and carboxy groups were highly flexible, with no significant structural disruption being observed on tilting them. The nanopillars captured Gram-negative and Gram-positive bacteria, despite their negatively charged surface leading an electrostatic repulsion with bacteria. The wing of the cicada has evolved to remain dry and maintain its lightweight. The water-containing cicada-wing structure may be an unknown encounter for bacteria and, thus, may become a countermeasure against the ever-changing bacteria.
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Affiliation(s)
- Kazuma Fujimoto
- Department of Materials and Life Science, Shizuoka Institute of Science and Technology, 2200-2 Toyosawa, Fukuroi, Shizuoka 437-8555, Japan
| | - Akihiro Saito
- Department of Materials and Life Science, Shizuoka Institute of Science and Technology, 2200-2 Toyosawa, Fukuroi, Shizuoka 437-8555, Japan
| | - Yohei Kotsuchibashi
- Department of Materials and Life Science, Shizuoka Institute of Science and Technology, 2200-2 Toyosawa, Fukuroi, Shizuoka 437-8555, Japan
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Dhawan B, Akhter G, Hamid H, Kesharwani P, Alam MS. Benzoxaboroles: New emerging and versatile scaffold with a plethora of pharmacological activities. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2021.132057] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Dikmen Z, Bütün V. Thiazolo thiazole based cross-linker to prepare highly fluorescent smart films with tunable emission wavelength and their multi-responsive usage. Eur Polym J 2021. [DOI: 10.1016/j.eurpolymj.2021.110759] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Fujimoto K, Yamawaki-Ogata A, Narita Y, Kotsuchibashi Y. Fabrication of Cationic Poly(vinyl alcohol) Films Cross-Linked Using Copolymers Containing Quaternary Ammonium Cations, Benzoxaborole, and Carboxy Groups. ACS OMEGA 2021; 6:17531-17544. [PMID: 34278139 PMCID: PMC8280637 DOI: 10.1021/acsomega.1c02013] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Accepted: 06/16/2021] [Indexed: 05/26/2023]
Abstract
Water-insoluble cationic poly(vinyl alcohol) (PVA) films were fabricated using a mixed aqueous solution of PVA and poly([2-(methacryloyloxy)ethyl]trimethylammonium chloride (METAC)-co-methacrylic acid (MAAc)-co-5-methacrylamido-1,2-benzoxaborole (MAAmBO)) copolymer (3D). The surface of the PVA film is typically negatively charged, and simple fabrication methods for water-insoluble PVA films with cationic surface charges are required to expand their application fields. METAC, which has a permanent positive charge owing to the presence of a quaternary ammonium cation, was selected as the cationic unit. The MAAc and MAAmBO units were used as two types of cross-linking structures for the thermal cross-linking of the hydroxy and carboxy groups of the MAAc unit (covalent bonding) as well as the diol and benzoxaborole groups of the MAAmBO unit (dynamic covalent bonding). The films were thermally cross-linked at 135 °C for 4 h without the addition of materials. After immersion in surplus water at 80 °C for 3 h, the cross-linked PVA/3D films retained almost 100% of their weights. The ζ-potential of the water-insoluble PVA/3D film was 9.4 ± 0.8 mV. The PVA/3D film was strongly dyed using anionic acid red 1 (AR1) because of its positively charged surface. Interestingly, it could also be slightly dyed using cationic methylene blue (MB) and became transparent (original state) after immersion in water for 2 days. These results suggested that positive and negative charges coexisted in the PVA/3D film, and the surface properties were positively inclined. Moreover, the degree of hemolysis of the PVA/3D films was similar to that of the negative control, which showed high blood compatibility. To our knowledge, this is the first report on the fabrication of water-insoluble cationic PVA films using two types of cross-linking structures containing carboxy and benzoxaborole groups. The cross-linked PVA films were analyzed using Fourier transform infrared (FT-IR) spectroscopy, differential scanning calorimetry (DSC), and contact angle (CA) and ζ-potential measurement, as well as by determining the mechanical properties, adsorption of charged molecules, and biocompatibility. These readily fabricated water-insoluble PVA films with positive charges can show potential applications in sensors, adsorption systems, and antimicrobial materials.
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Affiliation(s)
- Kazuma Fujimoto
- Department
of Materials and Life Science, Shizuoka
Institute of Science and Technology, 2200-2 Toyosawa, Fukuroi, Shizuoka 437-8555, Japan
| | - Aika Yamawaki-Ogata
- Department
of Cardiac Surgery, Nagoya University Graduate
School of Medicine, 65
Tsurumai-cho, Showa-ku, Nagoya, Aichi 466-8550, Japan
| | - Yuji Narita
- Department
of Cardiac Surgery, Nagoya University Graduate
School of Medicine, 65
Tsurumai-cho, Showa-ku, Nagoya, Aichi 466-8550, Japan
| | - Yohei Kotsuchibashi
- Department
of Materials and Life Science, Shizuoka
Institute of Science and Technology, 2200-2 Toyosawa, Fukuroi, Shizuoka 437-8555, Japan
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Kirihara M, Suzuki K, Nakakura K, Saito K, Nakamura R, Tujimoto K, Sakamoto Y, Kikkawa Y, Shimazu H, Kimura Y. Oxidation of fluoroalkyl alcohols using sodium hypochlorite pentahydrate [1]. J Fluor Chem 2021. [DOI: 10.1016/j.jfluchem.2020.109719] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Takizawa S, Kirihara M, Adachi K, Sakamoto Y, Tujimoto K, Yamahara S, Matsushima R, Namba Y, Kimura Y, Sato K, Kamada T. Chloroamidation of Alkenes Using Sodium Hypochlorite Pentahydrate and Its Application to Synthesis of Aziridines. HETEROCYCLES 2021. [DOI: 10.3987/com-20-s(k)68] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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