Specific modifications of galactomannans

A sample of galactomannan extracted from the seeds of Leucaema leucocephala is modified on a specific position using the reactant 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO). This method allows oxidation at the C-6 position of galactose and free mannose (not connected to a side group). The kinetics...

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Bibliographic Details
Published in:Carbohydrate polymers 2000, Vol.42 (1), p.51-57
Main Authors: Sierakowski, M.R., Milas, M., Desbrières, J., Rinaudo, M.
Format: Article
Language:English
Subjects:
Agents
Alkylation
Applied sciences
Characterization
Chemical Sciences
Exact sciences and technology
Extraction
Galactomannan
Natural polymers
New polyelectrolyte
Nuclear magnetic resonance
Nuclear magnetic resonance spectroscopy
Oxidation
Physicochemistry of polymers
Plants (botany)
Polyelectrolytes
Polymers
Reaction kinetics
Specific oxidation
Starch and polysaccharides
Sugars
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Summary:A sample of galactomannan extracted from the seeds of Leucaema leucocephala is modified on a specific position using the reactant 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO). This method allows oxidation at the C-6 position of galactose and free mannose (not connected to a side group). The kinetics of oxidation is followed under well-defined conditions. Different methods are proposed for the characterization of the modified polysaccharides and NMR spectroscopy is shown to give useful information. New polyelectrolytes are produced with different degrees of oxidation. Successive alkylations on the C-6 sites are investigated. The degree of alkylation obtained remains low but it can be increased easily to reinforce the amphiphilic character.
ISSN:0144-8617
1879-1344
DOI:10.1016/S0144-8617(99)00137-X