51
|
Ramella D, Polito L, Mazzini S, Ronchi S, Scaglioni L, Marelli M, Lay L. A Strategy for Multivalent Presentation of Carba Analogues fromN. meningitidisA Capsular Polysaccharide. European J Org Chem 2014. [DOI: 10.1002/ejoc.201402701] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
52
|
Kawasaki S, Muraoka T, Obara H, Ishii T, Hamada T, Kinbara K. Thermodriven Micrometer-Scale Aqueous-Phase Separation of Amphiphilic Oligoethylene Glycol Analogues. Chem Asian J 2014; 9:2778-88. [DOI: 10.1002/asia.201402134] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2014] [Revised: 04/15/2014] [Indexed: 11/08/2022]
|
53
|
Sadhukhan N, Muraoka T, Abe D, Sasanuma Y, Subekti DRG, Kinbara K. Thermoresponsive Self-assembly and Conformational Changes of Amphiphilic Monodisperse Short Poly(ethylene glycol)s in Water. CHEM LETT 2014. [DOI: 10.1246/cl.140241] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Nabanita Sadhukhan
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
| | - Takahiro Muraoka
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
| | - Daisuke Abe
- Department of Applied Chemistry and Biotechnology, Graduate School and Faculty of Engineering, Chiba University
| | - Yuji Sasanuma
- Department of Applied Chemistry and Biotechnology, Graduate School and Faculty of Engineering, Chiba University
| | | | - Kazushi Kinbara
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
| |
Collapse
|
54
|
Shima T, Muraoka T, Hoshino N, Akutagawa T, Kobayashi Y, Kinbara K. Thermally Driven Polymorphic Transition Prompting a Naked‐Eye‐Detectable Bending and Straightening Motion of Single Crystals. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201402560] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Tatsuya Shima
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2‐1‐1, Katahira, Aoba‐ku, Sendai 980‐8577 (Japan) http://www.tagen.tohoku.ac.jp/labo/kinbara/index.html
| | - Takahiro Muraoka
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2‐1‐1, Katahira, Aoba‐ku, Sendai 980‐8577 (Japan) http://www.tagen.tohoku.ac.jp/labo/kinbara/index.html
- Precursory Research for Embryonic Science and Technology, Japan Science and Technology Agency, 4‐1‐8, Honcho, Kawaguchi, Saitama 332‐0012 (Japan)
| | - Norihisa Hoshino
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2‐1‐1, Katahira, Aoba‐ku, Sendai 980‐8577 (Japan) http://www.tagen.tohoku.ac.jp/labo/kinbara/index.html
| | - Tomoyuki Akutagawa
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2‐1‐1, Katahira, Aoba‐ku, Sendai 980‐8577 (Japan) http://www.tagen.tohoku.ac.jp/labo/kinbara/index.html
| | - Yuka Kobayashi
- Advanced Key Technologies Division, National Institute for Materials Science, 1‐2‐1 Sengen, Tsukuba, Ibaraki 305‐0047 (Japan)
| | - Kazushi Kinbara
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2‐1‐1, Katahira, Aoba‐ku, Sendai 980‐8577 (Japan) http://www.tagen.tohoku.ac.jp/labo/kinbara/index.html
| |
Collapse
|
55
|
Shima T, Muraoka T, Hoshino N, Akutagawa T, Kobayashi Y, Kinbara K. Thermally driven polymorphic transition prompting a naked-eye-detectable bending and straightening motion of single crystals. Angew Chem Int Ed Engl 2014; 53:7173-8. [PMID: 24890277 DOI: 10.1002/anie.201402560] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2014] [Indexed: 11/09/2022]
Abstract
The amplification of molecular motions so that they can be detected by the naked eye (10(7) -fold amplification from the ångström to the millimeter scale) is a challenging issue in the development of mechanical molecular devices. In this context, the perfectly ordered molecular alignment of the crystalline phase has advantages, as demonstrated by the macroscale mechanical motions of single crystals upon the photochemical transformation of molecules. In the course of our studies on thermoresponsive amphiphiles containing tetra(ethylene glycol) (TEG) moieties, we serendipitously found that thermal conformational changes of TEG units trigger a single-crystal-to-single-crystal polymorphic phase transition. The single crystal of the amphiphile undergoes bending and straightening motion during both heating and cooling processes at the phase-transition temperatures. Thus, the thermally triggered conformational change of PEG units may have the advantage of inducing mechanical motion in bulk materials.
Collapse
Affiliation(s)
- Tatsuya Shima
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1, Katahira, Aoba-ku, Sendai 980-8577 (Japan) http://www.tagen.tohoku.ac.jp/labo/kinbara/index.html
| | | | | | | | | | | |
Collapse
|
56
|
Muraoka T, Sadhukhan N, Ui M, Kawasaki S, Hazemi E, Adachi K, Kinbara K. Thermal-aggregation suppression of proteins by a structured PEG analogue: Importance of denaturation temperature for effective aggregation suppression. Biochem Eng J 2014. [DOI: 10.1016/j.bej.2014.03.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
57
|
Muraoka T, Adachi K, Chowdhury R, Kinbara K. Transetherification on polyols by intra- and intermolecular nucleophilic substitutions. PLoS One 2014; 9:e91912. [PMID: 24663293 PMCID: PMC3963852 DOI: 10.1371/journal.pone.0091912] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2013] [Accepted: 02/16/2014] [Indexed: 11/19/2022] Open
Abstract
Transetherification on polyols involving intra- and intermolecular nucleophilic substitutions is reported. Di- or trialkoxide formation of propane-1,3-diol or 2-(hydroxymethyl)propane-1,3-diol derivatives by NaH triggers the reaction via oxetanes formation, where the order to add NaH and a polyol significantly influences the yields of products. It was demonstrated that the protective group on the pentaerythritol skeleton is apparently transferred to the hydrophilic and hydrophobic chain molecules bearing a leaving group in one-step, and a protective group conversion from tosyl to benzyl was successful using a benzyl-appending triol to afford a desired product in 67% yield.
Collapse
Affiliation(s)
- Takahiro Muraoka
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Aoba-ku, Sendai, Japan
- PRESTO, Japan Science and Technology Agency, Kawaguchi, Saitama, Japan
| | - Kota Adachi
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Aoba-ku, Sendai, Japan
| | - Rainy Chowdhury
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Aoba-ku, Sendai, Japan
| | - Kazushi Kinbara
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Aoba-ku, Sendai, Japan
| |
Collapse
|
58
|
Beecham MP, Clarkson GJ, Hall G, Marsh A. Nanostructures from self-assembling triazine tertiary amine N-oxide amphiphiles. Chemphyschem 2013; 14:3909-15. [PMID: 24203796 DOI: 10.1002/cphc.201300775] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2013] [Indexed: 11/08/2022]
Abstract
A new set of amphiphilic tertiary amine N-oxides has been prepared and their self-assembly properties observed in aqueous solution by tensiometry, dynamic and static light scattering. X-ray crystallographic analysis of parent amines and sulfoxide congeners indicates the formation of hydrogen-bonded dimers as the primary assembly unit for formation of vesicles in preference to the compact micelles typical of lauryl dimethylamine N-oxide (LDAO). 6-Benzyloxy-N,N'-bis(5-diethylaminopentylamine oxide)[1,3,5]triazine-2,4-diamine forms a 1 μm vesicle observed to entrap fluorescein. The [1,3,5]triazine core thus allows variation of the new self-assembled structures from nano- to micrometre length scales.
Collapse
Affiliation(s)
- Matthew P Beecham
- Department of Chemistry, University of Warwick, Coventry, CV4 7AL (UK), Fax: (+44) 24 7652 4112
| | | | | | | |
Collapse
|
59
|
Tomita S, Tanabe Y, Shiraki K. Oligoethylene glycols prevent thermal aggregation of α-chymotrypsin in a temperature-dependent manner: implications for design guidelines. Biotechnol Prog 2013; 29:1325-30. [PMID: 23804413 DOI: 10.1002/btpr.1762] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2013] [Revised: 05/07/2013] [Indexed: 12/29/2022]
Abstract
Protein aggregation is problematic in various fields, where aggregation can frequently occur during routine experiments. This study showed that tetraethylene glycol (TEG) and tetraethylene glycol dimethyl ether (TEGDE) act as aggregation suppressors that have different unique properties from typical additives to prevent protein aggregation, such as arginine (Arg) and NaCl. Thermal aggregation of α-chymotrypsin was well suppressed with the addition of both TEG and TEGDE. Interestingly, the suppressive effects of Arg and NaCl on thermal aggregation were almost unchanged when temperature was shifted from 65°C to 85°C, whereas both TEG and TEGDE significantly decreased the aggregation rate with increasing temperature. Note that the effects of TEG and TEGDE were higher than Arg above 75°C. This temperature-dependent behavior of TEG and TEGDE provides a novel design guideline to develop aggregation suppressors for use at high temperature, i.e., the importance of the ethylene oxide group.
Collapse
Affiliation(s)
- Shunsuke Tomita
- Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Tokyo, Japan
| | | | | |
Collapse
|
60
|
Yang D, Hou M, Ning H, Zhang J, Ma J, Han B. Efficient SO2 capture by amine functionalized PEG. Phys Chem Chem Phys 2013; 15:18123-7. [DOI: 10.1039/c3cp52911h] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|