| Origin of the commonly observed secondary relaxation process in saccharides. | |
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MedLine Citation:
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PMID: 20695497 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Broadband dielectric relaxation studies were performed on D-glucose and 1,6-anhydro-D-glucose. In the liquid phase of both systems, one can observe the cluster relaxation and structural relaxation. In the glassy state of D-glucose two secondary relaxations were recorded. The slower one, hardly detectable in the loss spectra, was identified as the Johari-Goldstein type (JG) relaxation. The faster one, the gamma-relaxation, is visible as a well pronounced peak. For the past few years the origin of this process has been a subject of hot debate. Different authors have speculated about the source of this relaxation, but no consensus was reached. Moreover, application of more sophisticated method, such as NMR and MD simulations have not resolved this problem yet. Comparison of the dielectric loss spectra measured for D-glucose and 1,6-anhydro-D-glucose, combined with other experimental findings described in detail in this paper, enabled us to certify unquestionably, that the rotation of hydroxymethyl group is the origin of gamma-relaxation in D-glucose as well as in the whole family of saccharides. Additionally, calculations of conformational changes with use of density functional theory (DFT) were performed to support our identification. |
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Authors:
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K Kaminski; P Wlodarczyk; K Adrjanowicz; E Kaminska; Z Wojnarowska; M Paluch |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: The journal of physical chemistry. B Volume: 114 ISSN: 1520-5207 ISO Abbreviation: J Phys Chem B Publication Date: 2010 Sep |
Date Detail:
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Created Date: 2010-08-26 Completed Date: 2010-12-21 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101157530 Medline TA: J Phys Chem B Country: United States |
Other Details:
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Languages: eng Pagination: 11272-81 Citation Subset: IM |
Affiliation:
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Institute of Physics, Silesian University, ul. Uniwersytecka 4, 40-007 Katowice, Poland. kaminski@us.edu.pl |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Glucose
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analogs & derivatives*,
chemistry* Magnetic Resonance Spectroscopy Molecular Dynamics Simulation |
| Chemical | |
Reg. No./Substance:
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498-07-7/1,6-anhydro-beta-glucopyranose; 50-99-7/Glucose |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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