| Influence of anomeric configuration on mechanochemical degradation of polysaccharides: cellulose versus amylose. | |
| | |
MedLine Citation:
|
PMID: 18030997 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
Cellulose and amylose are (1-->4)-linked polysaccharides that are used extensively in the textiles, paper, and food and feed industries and are finding increasing use as alternative fuels and so forth. At the molecular level, cellulose and amylose differ only in their anomeric configuration: beta in cellulose, alpha in amylose. During processing and end use, these polymers experience a variety of mechanochemical stresses, many through contact with transient elongational flow fields. Here, we subject solutions of both polysaccharides to extended periods of ultrasonic irradiation, as the cavitational bubble collapse characteristic of ultrasound experiments creates flow fields strictly analogous to those encountered in other transient elongational flow scenarios. With the use of multidetector size-exclusion chromatography, the effects of anomeric configuration on both the limiting molar mass, beyond which polymers do not degrade in transient elongation flow ( M lim), and the rate of degradation have been isolated in these (1-->4)-linked polysaccharides. This effect was found to be pronounced; for example, M lim (cellulose) = 5( M lim (amylose)). Also, while extensive change was observed in molar mass averages, distribution, polydispersity, and size of the analytes during degradation, their structure was found to remain invariant. A modified "path theory" of transient elongational flow degradation was proposed, with the persistence length identified as a parameter which embodies the minimum continuous path length and flexibility requirements of the theory. |
| | |
Authors:
|
André M Striegel |
Related Documents
:
|
669877 - Clinical localization of tubular transport of exogenous substances exhibiting urine flo... 18871877 - Immunochemical studies on blood groups; the methylpentose contents of hog and human blo... 2341967 - A model to account for the blood-to-plasma distribution of cyclosporin a in human blood. 2815097 - Influence of goat colchicine specific antibodies on murine colchicine disposition. 2689017 - Antipsoriatic effect of local corticosteroids--o2-consumption and blood flow measuremen... 7815637 - Hemodynamics of penile erection: iii. measurement of deep intracavernosal and subtunica... |
Publication Detail:
|
Type: Comparative Study; Journal Article Date: 2007-11-20 |
Journal Detail:
|
Title: Biomacromolecules Volume: 8 ISSN: 1526-4602 ISO Abbreviation: Biomacromolecules Publication Date: 2007 Dec |
Date Detail:
|
Created Date: 2007-12-11 Completed Date: 2008-02-28 Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 100892849 Medline TA: Biomacromolecules Country: United States |
Other Details:
|
Languages: eng Pagination: 3944-9 Citation Subset: IM |
Affiliation:
|
Department of Chemistry & Biochemistry, Florida State University, Tallahassee, Florida 32306-4390, USA. striegel@chem.fsu.edu |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Amylose
/
chemistry*,
metabolism Cellulose / chemistry*, metabolism Molecular Conformation Polysaccharides / chemistry*, metabolism |
| Chemical | |
Reg. No./Substance:
|
0/Polysaccharides; 9004-34-6/Cellulose; 9005-82-7/Amylose |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Metallo-phthalocyanine near-IR fluorophores: oligonucleotide conjugates and their applications in PC...
Next Document: A high strength nanocomposite based on microcrystalline cellulose and polyurethane.