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Koyakkat M, Ishida T, Fujita K, Shirota H. Low-Frequency Spectra of Hydrated Ionic Liquids with Kosmotropic and Chaotropic Anions. J Phys Chem B 2024; 128:4171-4182. [PMID: 38640467 DOI: 10.1021/acs.jpcb.4c01255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/21/2024]
Abstract
In this study, we investigated the water concentration dependence of the intermolecular vibrations of two hydrated ionic liquids (ILs), cholinium dihydrogen phosphate ([ch][dhp]) and cholinium bromide ([ch]Br), using femtosecond Raman-induced Kerr effect spectroscopy (fs-RIKES). The anions of the former and latter hydrated ILs are kosmotropic and chaotropic, respectively. We found that the spectral peak of ∼50 cm-1 shifted to the low-frequency side in hydrated [ch][dhp], indicating the weakening of its intermolecular interactions. In contrast, no change in the peak frequency of the low-frequency band at ∼50 cm-1 was observed with increasing water concentration in hydrated [ch]Br. The vibrational density of states (VDOS) spectra generated from molecular dynamics (MD) simulations were in qualitative agreement with the experimental results. Decomposition analysis of the VDOS spectra for each component revealed that the red shift of the low-frequency band in the hydrated [ch][dhp] upon water addition was essentially due to the contributions of anions and water rather than that of the cholinium cation. We also found from the low-frequency spectra of the two hydrated ILs that they differed in the concentration dependence of the 180 cm-1 band, which is assigned as a hindered translational motion of water molecules combined to form O···O stretching motions. From the relationship between the peak frequency of the low-frequency band and the bulk parameter, which is the square root of the surface tension divided by the density, we found that the peak frequency in the hydrated IL with kosmotropic [dhp]- depends on the bulk parameter, similar to the case for an aqueous solution of the typical deep eutectic solvent reline. However, the peak frequency of the hydrated IL with chaotropic Br- is constant with the bulk parameter.
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Affiliation(s)
- Maharoof Koyakkat
- Department of Chemistry, Chiba University, 1-33 Yayoi, Inage-ku, Chiba 263-8522, Japan
| | - Tateki Ishida
- Institute for Molecular Science and Research Center for Computational Science, 38 Nishigo-Naka, Myodaiji, Okazaki 444-8585, Japan
| | - Kyoko Fujita
- Department of Pathophysiology, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan
| | - Hideaki Shirota
- Department of Chemistry, Chiba University, 1-33 Yayoi, Inage-ku, Chiba 263-8522, Japan
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2
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Fujita K, Ohno H. Hydrated Ionic Liquids: Perspective for Bioscience. CHEM REC 2023; 23:e202200282. [PMID: 36744600 DOI: 10.1002/tcr.202200282] [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: 12/05/2022] [Revised: 01/20/2023] [Indexed: 02/07/2023]
Abstract
Hydrated ionic liquid (IL) is a simple mixture of IL and water. Unique aqueous electrolyte solution can be designed by mixing IL with limited amount of water. In most hydrated ILs, there are no free water and all are strongly interacted with ions. The properties of hydrated ILs, such as polarity, viscosity, ion mobility, and hydrogen bonding ability, can therefore be controlled simply by water content. This mixture is expected to provide similar environment to that of living cell, and is desired to be effective solvents for biomolecules. In this account, we would like to survey the basic properties, recent results, and future aspects of the hydrated ILs.
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Affiliation(s)
- Kyoko Fujita
- Department of Pathophysiology, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo, 192-0392, Japan
| | - Hiroyuki Ohno
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo, 184-8588, Japan
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3
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Rajapriya Inbaraj N, Song S, Chang R, Fujita K, Hayashi T. Investigation of Hydration States of Ionic Liquids by Fourier Transform Infrared Absorption Spectroscopy: Relevance to Stabilization of Protein Molecules. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:2558-2568. [PMID: 36753569 PMCID: PMC9948542 DOI: 10.1021/acs.langmuir.2c02851] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Revised: 12/22/2022] [Indexed: 06/18/2023]
Abstract
Among many kinds of ionic liquids, some hydrated ionic liquids (Hy ILs) have shown an exceptional capability to stabilize protein molecules and maintain their structure and functions over a long period. However, the complex IL-water interaction among these protein-stabilizing Hy ILs has yet to be elucidated clearly. In this work, we investigate the origin of the compatibility of ionic liquid with proteins from the viewpoint of hydration structure. We systematically analyzed the hydrogen-bonding state of water molecules around ionic liquid using Fourier transform infrared absorption (FT-IR) spectroscopy. We found that the native hydrogen-bonding network of water remained relatively unperturbed in the protein-stabilizing ILs. We also observed that the protein-stabilizing ILs have a strong electric field interaction with the surrounding water molecules and this water-IL interaction did not disrupt the water-water hydrogen-bonding interaction. On the other hand, protein-denaturing ILs perturb the hydrogen-bonding network of the water molecules to a greater extent. Furthermore, the protein-denaturing ILs were found to have a weak electric field effect on the water molecules. We speculate that the direct hydrogen bonding of the ILs with water molecules and the strong electric field of the ions lasting several hydration shells while maintaining the relatively unperturbed hydrogen-bonding network of the water molecules play an essential role in protein stabilization.
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Affiliation(s)
- Navin Rajapriya Inbaraj
- Department
of Materials Science and Engineering, School of Materials Science
and Chemical Technology, Tokyo Institute
of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama-shi, Kanagawa-ken 226-8502, Japan
| | - Subin Song
- Department
of Materials Science and Engineering, School of Materials Science
and Chemical Technology, Tokyo Institute
of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama-shi, Kanagawa-ken 226-8502, Japan
| | - Ryongsok Chang
- Department
of Materials Science and Engineering, School of Materials Science
and Chemical Technology, Tokyo Institute
of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama-shi, Kanagawa-ken 226-8502, Japan
| | - Kyoko Fujita
- Department
of Pathophysiology, Tokyo University of
Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan
| | - Tomohiro Hayashi
- Department
of Materials Science and Engineering, School of Materials Science
and Chemical Technology, Tokyo Institute
of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama-shi, Kanagawa-ken 226-8502, Japan
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4
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Hirata T, Takekiyo T, Yoshimura Y, Tokoro Y, Ishizaki T, Kizuka Y, Kuroda K. Cryostorage of unstable N-acetylglucosaminyltransferase-V by synthetic zwitterions. RSC Adv 2022; 12:11628-11631. [PMID: 35481097 PMCID: PMC9016413 DOI: 10.1039/d2ra01575g] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2022] [Accepted: 04/07/2022] [Indexed: 11/21/2022] Open
Abstract
We report biocompatible materials for cryostorage of unstable proteins such as cancer-related enzyme, N-acetylglucosaminyltransferase-V (GnT-V). GnT-V activity and the amount of protein after freezing were better retained in synthetic zwitterion solutions than in the glycerol solution. This study highlights the potential utility of synthetic zwitterions as novel cryoprotectants.
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Affiliation(s)
- Tetsuya Hirata
- Institute for Glyco-core Research (iGCORE), Gifu University Gifu Gifu 501-1193 Japan
| | - Takahiro Takekiyo
- Department of Applied Chemistry, National Defense Academy Yokosuka Kanagawa 239-8686 Japan
| | - Yukihiro Yoshimura
- Department of Applied Chemistry, National Defense Academy Yokosuka Kanagawa 239-8686 Japan
| | - Yuko Tokoro
- Institute for Glyco-core Research (iGCORE), Gifu University Gifu Gifu 501-1193 Japan
| | - Takeru Ishizaki
- Faculty of Biological Science and Technology, Institute of Science and Engineering, Kanazawa University Kakuma-machi Kanazawa 920-1192 Japan
| | - Yasuhiko Kizuka
- Institute for Glyco-core Research (iGCORE), Gifu University Gifu Gifu 501-1193 Japan
| | - Kosuke Kuroda
- Faculty of Biological Science and Technology, Institute of Science and Engineering, Kanazawa University Kakuma-machi Kanazawa 920-1192 Japan
- NanoMaterials Research Institute, Kanazawa University Kakuma-machi Kanazawa 920-1192 Japan
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Matsuda N, Okabe H, Nagamura T, Nakano K. Direct Electron Transfer Reaction of Cytochrome c Immobilized on a Bare ITO Electrode. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2021. [DOI: 10.1246/bcsj.20200192] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Naoki Matsuda
- Sensing System Research Center, AIST, 807-1 Shukumachi, Tosu, Saga 841-0052, Japan
| | - Hirotaka Okabe
- Sensing System Research Center, AIST, 807-1 Shukumachi, Tosu, Saga 841-0052, Japan
| | - Toshihiko Nagamura
- Sensing System Research Center, AIST, 807-1 Shukumachi, Tosu, Saga 841-0052, Japan
| | - Koji Nakano
- Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
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Tanaka M, Morita S, Hayashi T. Role of interfacial water in determining the interactions of proteins and cells with hydrated materials. Colloids Surf B Biointerfaces 2020; 198:111449. [PMID: 33310639 DOI: 10.1016/j.colsurfb.2020.111449] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Revised: 10/09/2020] [Accepted: 11/01/2020] [Indexed: 01/27/2023]
Abstract
Water molecules play a crucial role in biointerfacial interactions, including protein adsorption and desorption. To understand the role of water in the interaction of proteins and cells at biological interfaces, it is important to compare particular states of hydration water with various physicochemical properties of hydrated biomaterials. In this review, we discuss the fundamental concepts for determining the interactions of proteins and cells with hydrated materials along with selected examples corresponding to our recent studies, including poly(2-methoxyethyl acrylate) (PMEA), PMEA derivatives, and other biomaterials. The states of water were analyzed by differential scanning calorimetry, in situ attenuated total reflection infrared spectroscopy, and surface force measurements. We found that intermediate water which is loosely bound to a biomaterial, is a useful indicator of the bioinertness of material surfaces. This finding on intermediate water provides novel insights and helps develop novel experimental models for understanding protein adsorption in a wide range of materials, such as those used in biomedical applications.
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Affiliation(s)
- Masaru Tanaka
- Institute for Materials Chemistry and Engineering, Kyushu University, CE41 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan.
| | - Shigeaki Morita
- Department of Engineering Science, Osaka Electro-Communication University, 18-8 Hatsucho, Neyagawa, 572-8530, Japan
| | - Tomohiro Hayashi
- Department of Materials Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa, 226-8502, Japan; JST-PRESTO, 4-1-8 Hon-cho, Kawaguchi, Saitama, 332-0012, Japan
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7
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Thermoresponsive ionic liquid/water mixtures for separation and purification technologies. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2020.117286] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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8
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Mason TG, Seeger ZL, Nguyen ALP, Fujita K, Izgorodina EI. Predicting Entropic Effects of Water Mixing with Ionic Liquids Containing Anions of Strong Hydrogen Bonding Ability: Role of the Cation. J Phys Chem B 2020; 124:9182-9194. [PMID: 33007160 DOI: 10.1021/acs.jpcb.0c07732] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Ionic liquids (ILs) such as choline dihydrogen phosphate exhibit an extraordinary solubilizing ability for proteins such as cytochrome C when mixed with 20 wt % water. Most widely used imidazolium-based ionic liquids coupled with dihydrogen phosphate do not exhibit the same solubilizing properties, suggesting that a multifunctional cation such as choline might play a key role in enhancing these properties of ionic liquid mixtures with water. In this theoretical work, we compare intermolecular interactions between the water molecule and ionic liquid ions in two ion-paired clusters of choline- and 1-butyl-3-methyl-imidazolium-based ionic liquids coupled with acetate, dihydrogen phosphate, and mesylate. Gibbs free energy (GFE) of solvation of water in these ionic liquids was calculated. Incorporation of a water molecule into ionic liquid clusters was accompanied by negative GFEs of solvation in both types of cations. These results were in good agreement with previously reported experimental GFEs of solvation of water in ILs. Compared to imidazolium-based clusters, strong interionic interactions of choline ionic liquids resulted in more negative GFEs due to their smaller deformation upon the addition of a water molecule, with dihydrogen phosphate and mesylate predicting the lowest GFEs of -30.1 and -43.5 kJ/mol-1, respectively. Lower GFEs of solvation of water in choline-based clusters were also accompanied with smaller entropic penalties, suggesting that water easily incorporates itself into the existing ionic network. Analysis of the intramolecular bonds within the water molecule showed that the choline hydroxyl group donates electron density to the neighboring water molecule, leading to additional polarization. The predicted infrared spectra of clusters of ionic liquids with water showed a pronounced red shift due to strongly polarized O-H bonds, in excellent agreement with the experimentally measured infrared spectra of ionic liquid mixtures with water. Increased polarization of water in choline-based ionic liquids undoubtedly creates more effective solvents for stabilizing biological molecules such as proteins.
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Affiliation(s)
- Thomas G Mason
- School of Chemistry, Monash University, 17 Rainforest Walk, Clayton, VIC 3800, Australia
| | - Zoe L Seeger
- School of Chemistry, Monash University, 17 Rainforest Walk, Clayton, VIC 3800, Australia
| | - Anh L P Nguyen
- School of Chemistry, Monash University, 17 Rainforest Walk, Clayton, VIC 3800, Australia
| | - Kyoko Fujita
- Department of Pathophysiology, School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan
| | - Ekaterina I Izgorodina
- School of Chemistry, Monash University, 17 Rainforest Walk, Clayton, VIC 3800, Australia
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9
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Tanaka M, Kobayashi S, Murakami D, Aratsu F, Kashiwazaki A, Hoshiba T, Fukushima K. Design of Polymeric Biomaterials: The “Intermediate Water Concept”. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2019. [DOI: 10.1246/bcsj.20190274] [Citation(s) in RCA: 54] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Masaru Tanaka
- Soft Materials Chemistry, Institute for Materials Chemistry and Engineering, Kyushu University, Build. CE41, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Shingo Kobayashi
- Soft Materials Chemistry, Institute for Materials Chemistry and Engineering, Kyushu University, Build. CE41, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Daiki Murakami
- Soft Materials Chemistry, Institute for Materials Chemistry and Engineering, Kyushu University, Build. CE41, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Fumihiro Aratsu
- Soft Materials Chemistry, Institute for Materials Chemistry and Engineering, Kyushu University, Build. CE41, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Aki Kashiwazaki
- Soft Materials Chemistry, Institute for Materials Chemistry and Engineering, Kyushu University, Build. CE41, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Takashi Hoshiba
- Frontier Center for Organic Materials, Yamagata University, 4-3-16 Yonezawa, Yamagata 992-8510, Japan
| | - Kazuki Fukushima
- Graduate School of Organic Materials Science, Yamagata University, 4-3-16 Yonezawa, Yamagata 992-8510, Japan
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10
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Ohno H, Yoshizawa-Fujita M, Kohno Y. Functional Design of Ionic Liquids: Unprecedented Liquids that Contribute to Energy Technology, Bioscience, and Materials Sciences. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2019. [DOI: 10.1246/bcsj.20180401] [Citation(s) in RCA: 56] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Hiroyuki Ohno
- Tokyo University of Agriculture and Technology, 3-8-1 Harumi-cho, Fuchu, Tokyo 183-8538, Japan
| | - Masahiro Yoshizawa-Fujita
- Department of Materials and Life Sciences, Sophia University, 7-1 Kioi-cho, Chiyoda-ku, Tokyo 102-8554, Japan
| | - Yuki Kohno
- National Institute of Advanced Industrial Science and Technology (AIST), 4-2-1 Nigatake, Miyagino-ku, Sendai, Miyagi 983-8551, Japan
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11
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Nikawa Y, Tsuzuki S, Ohno H, Fujita K. Hydration States of Cholinium Phosphate-Type Ionic Liquids as a Function of Water Content. Aust J Chem 2019. [DOI: 10.1071/ch18381] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
We investigated the hydration states of cholinium phosphate-type ionic liquids (ILs) in relation to ion structure, focusing on the influence of the hydroxyl group of the cation and the alkyl chain length of the anion. Water activity measurements provided information on the macroscopic hydration states of the hydrated ILs, while NMR measurements and molecular dynamics simulations clearly showed the microscopic interactions and coordination of the water molecules. The hydrogen bonding networks in these ILs were influenced by the anion structure and water content, and the mobility of water molecules was influenced by the number of hydroxyl groups in the cation and anion.
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12
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Kuroda K, Kodo C, Ninomiya K, Takahashi K. A Polar Liquid Zwitterion Does Not Critically Destroy Cytochrome c at High Concentration: An Initial Comparative Study with a Polar Ionic Liquid. Aust J Chem 2019. [DOI: 10.1071/ch18533] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
A polar carboxylate-type zwitterion with a small volume of water can dissolve cytochrome c without significant disruption, compared with the case of a popular polar carboxylate-type ionic liquid, 1-ethyl-3-methylimidazolium acetate. A change in the Soret, Q, and 615nm bands was not observed in the 80 wt-% polar zwitterion solution, whereas a shift in the Soret band, diminishing Q band, and appearance of the 615nm band was found in the 80 wt-% polar ionic liquid solution. It suggests that concentrated polar ionic liquid solutions critically disrupt the structure of cytochrome c, and the polar zwitterion solution used in this study was better than a 1-ethyl-3-methylimidazolium acetate solution in a high concentration range.
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13
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Kuroda K, Kohno Y, Ohno H. Renaturation of Cytochrome c Dissolved in Polar Phosphonate-type Ionic Liquids Using Highly Polar Zwitterions. CHEM LETT 2017. [DOI: 10.1246/cl.170153] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Kosuke Kuroda
- Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588
- Functional Ionic Liquid Laboratories, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588
| | - Yuki Kohno
- Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588
- Functional Ionic Liquid Laboratories, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588
| | - Hiroyuki Ohno
- Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588
- Functional Ionic Liquid Laboratories, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588
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14
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Kumar A, Bisht M, Venkatesu P. Biocompatibility of ionic liquids towards protein stability: A comprehensive overview on the current understanding and their implications. Int J Biol Macromol 2017; 96:611-651. [DOI: 10.1016/j.ijbiomac.2016.12.005] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Revised: 12/02/2016] [Accepted: 12/04/2016] [Indexed: 10/20/2022]
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15
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Nikawa Y, Fujita K, Ohno H. Quantitative assessment of kosmotropicity of hydrated ionic liquids by nuclear magnetic resonance. Phys Chem Chem Phys 2017; 19:8148-8151. [DOI: 10.1039/c6cp07463d] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The NMR chemical shift variation of H2O varied with the component ion and reflected the kosmotropicity quantitatively in hydrated ionic liquids.
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Affiliation(s)
- Yohsuke Nikawa
- Department of Biotechnology
- Tokyo University of Agriculture and Technology
- Koganei
- Japan
- Functional Ionic Liquid Laboratories (FILL)
| | - Kyoko Fujita
- Department of Biotechnology
- Tokyo University of Agriculture and Technology
- Koganei
- Japan
- Functional Ionic Liquid Laboratories (FILL)
| | - Hiroyuki Ohno
- Department of Biotechnology
- Tokyo University of Agriculture and Technology
- Koganei
- Japan
- Functional Ionic Liquid Laboratories (FILL)
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16
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Yoshimura Y, Takekiyo T, Mori T. Structural study of lysozyme in two ionic liquids at cryogenic temperature. Chem Phys Lett 2016. [DOI: 10.1016/j.cplett.2016.10.013] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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17
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Ohno H, Fujita K, Kohno Y. Is seven the minimum number of water molecules per ion pair for assured biological activity in ionic liquid-water mixtures? Phys Chem Chem Phys 2016; 17:14454-60. [PMID: 25968477 DOI: 10.1039/c5cp00768b] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ionic liquids (ILs) containing small amounts of water are called hydrated ILs and they show diverse physico-chemical properties that are strongly dependent on their water content. Some properties of hydrated ILs, such as biological activity and phase transition behaviour, were found to change non-linearly, with an inflection at a water molecule to ion pair ratio of around 7:1. This critical hydration number of ILs has been discussed in this paper with respect to the state of solvated water molecules.
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Affiliation(s)
- Hiroyuki Ohno
- Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan.
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18
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Neise C, Rautenberg C, Bentrup U, Beck M, Ahrenberg M, Schick C, Keßler O, Kragl U. Stability studies of ionic liquid [EMIm][NTf2] under short-term thermal exposure. RSC Adv 2016. [DOI: 10.1039/c6ra06129j] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Mass spectrometer coupled TG analysis was used to identify decomposition products of thermally highly stressed ionic liquids.
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Affiliation(s)
- Christin Neise
- Institute of Chemistry
- University of Rostock
- 18059 Rostock
- Germany
| | | | - Ursula Bentrup
- Leibniz Institute for Catalysis (LIKAT Rostock)
- 18059 Rostock
- Germany
| | - Martin Beck
- Faculty of Mechanical Engineering and Marine Technology
- Chair of Materials Science
- University of Rostock
- 18059 Rostock
- Germany
| | | | | | - Olaf Keßler
- Faculty of Mechanical Engineering and Marine Technology
- Chair of Materials Science
- University of Rostock
- 18059 Rostock
- Germany
| | - Udo Kragl
- Institute of Chemistry
- University of Rostock
- 18059 Rostock
- Germany
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19
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El Sayed Moussa M, Guillois K, Shen W, Réau R, Crassous J, Lescop C. Dissymmetrical U-Shaped π-Stacked Supramolecular Assemblies by Using a Dinuclear CuIClip with Organophosphorus Ligands and Monotopic Fully π-Conjugated Ligands. Chemistry 2014; 20:14853-67. [DOI: 10.1002/chem.201403758] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2014] [Indexed: 11/12/2022]
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