Document Detail


(13)C nuclear magnetic relaxation study of segmental dynamics of the heteropolysaccharide pullulan in dilute solutions.
MedLine Citation:
PMID:  11777385     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
(13)C spin-lattice relaxation times (T(1)) and nuclear Overhauser enhancements (NOE) were measured as a function of temperature and magnetic field strength for the heteropolysaccharide pullulan in two solvents, water and dimethyl sulfoxide. The relaxation data of the endocyclic ring carbons were successfully interpreted in terms of chain segmental motions by using the bimodal time-correlation function of Dejean de la Batie, Laupretre, and Monnerie. On the basis of the calculated correlation times for segmental motion, the flexibilities of the pullulan chain at a repeat-unit level have been studied and compared with the segmental mobility of the homopolysaccharides amylose and dextran in the same solvents. The internal rotation of the free hydroxymethyl groups about the exocyclic C-5 [bond] C-6 bonds superimposed on segmental motion has been described as a diffusion process of restricted amplitude. The rate and amplitude of the internal rotation of the free hydroxymethyl groups were not affected by the local geometry of the pullulan chain.
Authors:
P Dais; S Vlachou; F R Taravel
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Biomacromolecules     Volume:  2     ISSN:  1525-7797     ISO Abbreviation:  Biomacromolecules     Publication Date:  2001  
Date Detail:
Created Date:  2002-01-04     Completed Date:  2003-05-09     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  100892849     Medline TA:  Biomacromolecules     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1137-47     Citation Subset:  IM    
Affiliation:
NMR Laboratory, Department of Chemistry, University of Crete, Iraklion, Crete, Greece. dias@chemistry.uch.gr
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MeSH Terms
Descriptor/Qualifier:
Carbohydrate Conformation
Carbon Isotopes
Glucans / chemistry*
Half-Life
Magnetics
Models, Molecular
Nuclear Magnetic Resonance, Biomolecular / methods*
Solutions
Temperature
Viscosity
Chemical
Reg. No./Substance:
0/Carbon Isotopes; 0/Glucans; 0/Solutions; 9057-02-7/pullulan

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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