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Nakata Y, Kitamura S, Terao K. Dual thermoresponsive polysaccharide derivative - water system. Partially substituted amylose butylcarbamate in water. Carbohydr Polym 2024; 325:121587. [PMID: 38008477 DOI: 10.1016/j.carbpol.2023.121587] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2023] [Revised: 10/27/2023] [Accepted: 11/10/2023] [Indexed: 11/28/2023]
Abstract
Partially substituted amylose n-butylcarbamate (ABC) samples were synthesized with weight-average molar mass Mw ranging between 40 kg mol-1 and 220 kg mol-1 with different degree of substitution DS. When DS was between 0.17 and 0.33, the ABC samples were soluble in water. Furthermore, both LCST and UCST type phase separations were observed for the ABC samples in water when DS is >0.26. The closed-loop phase diagrams for the dual thermoresponsive ABC samples in water were constructed by turbidity measurement. The UCST ranged from 70 °C to 77 °C and the LCST ranged from 13 °C to 17 °C. SAXS measurements were performed for dilute aqueous ABC solutions to determine the chain conformation of ABC at various temperatures. The resulting form factor at the polymer mass concentration of 3 mg mL-1 indicated that the chain conformation is almost independent of temperature, except for the chain diameter, which is influenced by the temperature-dependent hydration behavior. This result suggests that the attractive interactions between ABC chains are not very significant even between UCST and LCST, where higher concentrated polymer solutions show macroscopic phase separation.
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Affiliation(s)
- Yuma Nakata
- Department of Macromolecular Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama-cho, Toyonaka, Osaka 560-0043, Japan
| | - Shinichi Kitamura
- Center for Research and Development of Bioresources, Organization for Research Promotion, Osaka Prefecture University, 1-2, Gakuen-cho, Naka-ku, Sakai 599-8570, Japan
| | - Ken Terao
- Department of Macromolecular Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama-cho, Toyonaka, Osaka 560-0043, Japan.
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2
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Xie W, He S, Fang S, Yin B, Tian R, Wang Y, Wang D. Analysis of starch dissolved in ionic liquid by glass nanopore at single molecular level. Int J Biol Macromol 2023; 239:124271. [PMID: 37019197 DOI: 10.1016/j.ijbiomac.2023.124271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2023] [Revised: 03/06/2023] [Accepted: 03/27/2023] [Indexed: 04/05/2023]
Abstract
In this paper, the glass nanopore technology was proposed to detect a single molecule of starch dissolved in ionic liquid [1-butyl-3-methylimidazolium chloride (BmimCl)]. Firstly, the influence of BmimCl on nanopore detection is discussed. It is found that a certain amount of strong polar ionic liquids will disturb the charge distribution in nanopores and increase the detection noise. Then, by analysis of the characteristic current signal of the conical nanopore, the motion behaviour of starch near the entrance of the nanopore was studied and analysis the dominant ion of starch in the BmimCl dissolution process. Finally, based on nuclear magnetic resonance (NMR) and Fourier transform infrared (FTIR) spectroscopy simply discussed the mechanism of amylose and amylopectin dissolved in BmimCl. These results confirm that branched chain structure would affect the dissolution of polysaccharides in ionic liquids and the contribution of anions to the dissolution of polysaccharides are dominant. It is further proved that the current signal can be used to judge the charge and structure information of the analyte, and the dissolution mechanism can be assist analyzed at the single molecule level.
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Annamraju A, Rajan K, Zuo X, Long BK, Pingali SV, Elder TJ, Labbé N. Atomic Level Interactions and Suprastructural Configuration of Plant Cell Wall Polymers in Dialkylimidazolium Ionic Liquids. Biomacromolecules 2023; 24:2164-2172. [PMID: 36977326 DOI: 10.1021/acs.biomac.3c00047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/30/2023]
Abstract
Ionic liquids (ILs) have been widely investigated for the pretreatment and deconstruction of lignocellulosic feedstocks. However, the modes of interaction between IL-anions and cations, and plant cell wall polymers, namely, cellulose, hemicellulose, and lignin, as well as the resulting ultrastructural changes are still unclear. In this study, we investigated the atomic level and suprastructural interactions of microcrystalline cellulose, birchwood xylan, and organosolv lignin with 1,3-dialkylimidazolium ILs having varying sizes of carboxylate anions. Analysis by 13C NMR spectroscopy indicated that cellulose and lignin exhibited stronger hydrogen bonding with acetate ions than with formate ions, as evidenced by greater chemical shift changes. Small-angle X-ray scattering analysis showed that while both cellulose and xylan adopted a single-stranded conformation in acetate-ILs, twice as many acetate ions were bound to one anhydroglucose unit than to an anhydroxylose unit. We also determined that a minimum of seven representative carbohydrate units must interact with an anion for that IL to effectively dissolve cellulose or xylan. Lignin is associated as groups of four polymer molecules in formate-ILs and dispersed as single molecules in acetate-ILs, which indicates that it is highly soluble in the latter. In summary, our study demonstrated that 1,3-dialkylimidazolium acetates displayed stronger binding interactions with cellulose and lignin, as compared to formates, and thus have superior potential to fractionate these polymers from lignocellulosic feedstocks.
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Affiliation(s)
| | | | - Xiaobing Zuo
- X-ray Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Brian K Long
- Department of Chemistry, The University of Tennessee, Knoxville, Tennessee 37996, United States
| | | | - Thomas J Elder
- USDA-Forest Service, Southern Research Station, Auburn, Alabama 36849, United States
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Molecular structure and chiral recognition ability of highly branched cyclic dextrin carbamate derivative. Carbohydr Polym 2022; 290:119491. [DOI: 10.1016/j.carbpol.2022.119491] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2022] [Revised: 03/17/2022] [Accepted: 04/12/2022] [Indexed: 11/20/2022]
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Aoki K, Sugawara-Narutaki A, Doi Y, Takahashi R. Structure and Rheology of Poly(vinylidene difluoride- co-hexafluoropropylene) in an Ionic Liquid: The Solvent Behaves as a Weak Cross-Linker through Ion–Dipole Interaction. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c00485] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Kota Aoki
- Department of Energy Engineering, Graduate School of Engineering, Furo-cho, Chikusa-ku, Nagoya 464-8603, Aichi, Japan
| | - Ayae Sugawara-Narutaki
- Department of Energy Engineering, Graduate School of Engineering, Furo-cho, Chikusa-ku, Nagoya 464-8603, Aichi, Japan
| | - Yuya Doi
- Department of Materials Physics, Graduate School of Engineering, Furo-cho, Chikusa-ku, Nagoya 464-8603, Aichi, Japan
| | - Rintaro Takahashi
- Department of Energy Engineering, Graduate School of Engineering, Furo-cho, Chikusa-ku, Nagoya 464-8603, Aichi, Japan
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Tomofuji Y, Matsuo K, Terao K. Kinetics of denaturation and renaturation processes of double-stranded helical polysaccharide, xanthan in aqueous sodium chloride. Carbohydr Polym 2022; 275:118681. [PMID: 34742411 DOI: 10.1016/j.carbpol.2021.118681] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Revised: 09/12/2021] [Accepted: 09/15/2021] [Indexed: 11/02/2022]
Abstract
Circular dichroism (CD) and small-angle X-ray scattering (SAXS) measurements were made for three xanthan samples, a double helical polysaccharide, in 5 or 10 mM aqueous NaCl after rapid temperature change to investigate the kinetics of the conformational change between the ordered and disordered states. After the rapid heating, the CD signal mainly reflecting the carbonyl groups on the side chains quickly changed (<150 s) while the scattering intensity from SAXS around q (magnitude of the scattering vector) = 1 nm-1 changed more gradually, reflecting the main-chain conformation. The difference between CD and SAXS implies us the intermediate conformation which can be regarded as a loose double helix. The SAXS profile in the rapid cooling process showed that the loose double helical structure was constructed within 150 s, but the CD signal slowly changed with around 2 days to recover the native tight double helix.
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Affiliation(s)
- Yu Tomofuji
- Department of Macromolecular Science, Graduate School of Science, Osaka University, 1-1, Machikaneyama-cho, Toyonaka, Osaka 560-0043, Japan.
| | - Koichi Matsuo
- Hiroshiema Synchrotron Radiation Center, Hiroshima University, Kagamiyama, Higashi-hiroshima, Hiroshima 739-0046, Japan.
| | - Ken Terao
- Department of Macromolecular Science, Graduate School of Science, Osaka University, 1-1, Machikaneyama-cho, Toyonaka, Osaka 560-0043, Japan.
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Kinose Y, Sakakibara K, Ogawa H, Tsujii Y. Main-Chain Stiffness of Cellulosic Bottlebrushes with Polystyrene Side Chains Introduced Regioselectively at the O-6 Position. Macromolecules 2019. [DOI: 10.1021/acs.macromol.9b01628] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yuji Kinose
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Keita Sakakibara
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Hiroki Ogawa
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Yoshinobu Tsujii
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
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Wang J, Ren F, Yu J, Copeland L, Wang S, Wang S. Toward a Better Understanding of Different Dissolution Behavior of Starches in Aqueous Ionic Liquids at Room Temperature. ACS OMEGA 2019; 4:11312-11319. [PMID: 31460234 PMCID: PMC6648505 DOI: 10.1021/acsomega.9b00962] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Accepted: 06/12/2019] [Indexed: 05/27/2023]
Abstract
The purpose of this study was to understand the dissolution behavior of maize and potato starches in 1-ethyl-3-methylimidazolium acetate ([Emim][OAc]):water mixtures at room temperature. With an increasing ratio of ionic liquid (IL):water, the long- and short-range ordered structures and granule morphology of both starches were disrupted progressively. The multiscale structure of maize starch was disrupted completely after treatment with the [Emim][OAc]:water mixture of 6:4, indicating good dissolution performance of this mixture for maize starch. This mixture seemed to provide a balance between the viscosity of the solvent and availability of ions to disrupt starch H-bonds. The different dissolution behaviors of maize and potato starches in [Emim][OAc]:water mixtures were attributed to structural differences of the granule surfaces. Our results showed that the dissolution behavior of starches was affected by both starch sources and properties of [Emim][OAc]:water mixtures, which may provide guidance for the development of green technology for processing of biopolymers with low energy consumption.
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Affiliation(s)
- Jinwei Wang
- State
Key Laboratory of Food Nutrition and Safety and School of Food Engineering and
Biotechnology, Tianjin University of Science
& Technology, Tianjin 300457, China
| | - Fei Ren
- State
Key Laboratory of Food Nutrition and Safety and School of Food Engineering and
Biotechnology, Tianjin University of Science
& Technology, Tianjin 300457, China
| | - Jinglin Yu
- State
Key Laboratory of Food Nutrition and Safety and School of Food Engineering and
Biotechnology, Tianjin University of Science
& Technology, Tianjin 300457, China
| | - Les Copeland
- Sydney
Institute of Agriculture, School of Life and Environmental Sciences, The University of Sydney, Sydney, NSW 2006, Australia
| | - Shuo Wang
- Tianjin
Key Laboratory of Food Science and Health, School of Medicine, Nankai University, Tianjin 300071, China
| | - Shujun Wang
- State
Key Laboratory of Food Nutrition and Safety and School of Food Engineering and
Biotechnology, Tianjin University of Science
& Technology, Tianjin 300457, China
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Kameyama Y, Kitamura S, Sato T, Terao K. Self-Assembly of Amphiphilic Amylose Derivatives in Aqueous Media. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:6719-6726. [PMID: 31038315 DOI: 10.1021/acs.langmuir.9b00985] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Six amylose derivative (C12CMA) samples with hydrophobic dodecyl ether groups and hydrophilic sodium carboxymethyl groups were synthesized from an enzymatically synthesized amylose for which the weight-average molar mass is 50 kg mol-1 to realize amylose-based amphiphilic polymer micelles. The degree of substitution of hydrophobic (DSC12) and hydrophilic (DSCM) groups ranges between 0.076 and 0.39 and between 0.35 and 1.83, respectively. Static and dynamic light scattering, small-angle X-ray scattering (SAXS), and fluorescence measurements with pyrene as a probe were carried out for the samples in 150 mM aqueous NaCl to characterize the higher-order structure in solution. The fluorescence from pyrene showed that all six samples have hydrophobic environment, while the hydrophobicity tends to increase with rising DSC12. All six samples have high scattering intensity owing to the relatively large concentrated droplets ranging in the hydrodynamic radius from 50 to 110 nm, whereas the weight fraction of such large particles is substantially small except for the highest DSC12 sample. Most polymer chains for relatively low DSC12 of 0.076 were molecularly dispersed with a very small amount of large droplets. The dispersed chain has a slightly smaller helix pitch per residue and a more rigid main chain than those for amylose in dimethyl sulfoxide, suggesting that the amylosic main chain of C12CMA has a helical structure with dodecyl groups at least locally. On the other hand, an anisotropic shaped micelle-like structure is only found for relatively high DSC12 (0.23 and 0.39) samples, which was detected by the SAXS profile at a high scattering vector range. The micelle structure for high DSC12 samples is consistent with the high chain stiffness.
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Affiliation(s)
- Yuki Kameyama
- Department of Macromolecular Science, Graduate School of Science , Osaka University , 1-1, Machikaneyama-cho , Toyonaka , Osaka 560-0043 , Japan
| | - Shinichi Kitamura
- Graduate School of Life and Environmental Sciences , Osaka Prefecture University , 1-1, Gakuencho , Nakaku, Sakai , Osaka 599-8531 , Japan
| | - Takahiro Sato
- Department of Macromolecular Science, Graduate School of Science , Osaka University , 1-1, Machikaneyama-cho , Toyonaka , Osaka 560-0043 , Japan
| | - Ken Terao
- Department of Macromolecular Science, Graduate School of Science , Osaka University , 1-1, Machikaneyama-cho , Toyonaka , Osaka 560-0043 , Japan
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TERAO K, JIANG X, RYOKI A, HASEGAWA H. Molecular Conformation and Intermolecular Interactions of Linear, Cyclic, and Branched Polymers in Solution by Means of Synchrotron-Radiation Small-Angle X-ray Scattering. KOBUNSHI RONBUNSHU 2018. [DOI: 10.1295/koron.2017-0088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Ken TERAO
- Department of Macromolecular Science, Osaka University
| | - XinYue JIANG
- Department of Macromolecular Science, Osaka University
| | - Akiyuki RYOKI
- Department of Macromolecular Science, Osaka University
| | - Hirokazu HASEGAWA
- Department of Macromolecular Science, Osaka University
- Materials Characterization Laboratories, Toray Research Center, Inc
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Hirosawa K, Fujii K, Hashimoto K, Shibayama M. Solvated Structure of Cellulose in a Phosphonate-Based Ionic Liquid. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b01138] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Kazu Hirosawa
- Institute
for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - Kenta Fujii
- Graduate
School of Sciences and Technology for Innovation, Yamaguchi University, 2-16-1 Tokiwadai,
Ube, Yamaguchi 755-8611, Japan
| | - Kei Hashimoto
- Department
of Chemistry and Biotechnology, Yokohama National University, 79-5 Tokiwadai,
Hodogaya-ku, Yokohama 240-8501, Japan
| | - Mitsuhiro Shibayama
- Institute
for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
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Jiang X, Sato T, Terao K. Chain stiffness of cellulose tris(phenylcarbamate) in tricresyl phosphate (TCP). Polym Bull (Berl) 2017. [DOI: 10.1007/s00289-017-2094-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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