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Solubility and structure of N-carboxymethylchitosan
R A Muzzarelli1, P Ilari, M Petrarulo
1Institute of Biochemistry, Faculty of Medicine, University, Ancona, Italy.
International Journal of Biological Macromolecules
|August 1, 1994
Summary
Water-soluble N-carboxymethylchitosan was synthesized from crab and shrimp using specific reactant ratios. Enzymatic treatment prevents gelation and precipitation, enhancing stability for various applications.
Area of Science:
- Biochemistry
- Polymer Chemistry
- Materials Science
Background:
- Chitosan, a biopolymer derived from chitin, exhibits poor water solubility, limiting its applications.
- Chemical modification of chitosan can improve its physicochemical properties, such as solubility and biocompatibility.
Purpose of the Study:
- To synthesize water-soluble N-carboxymethylchitosan (NCMC) from crab and shrimp chitosans.
- To characterize the structure and properties of the synthesized NCMC.
- To investigate methods for improving the stability of NCMC solutions.
Main Methods:
- Synthesis of NCMC using crab and shrimp chitosans and glyoxylic acid.
- High-performance liquid chromatography (HPLC) for quantifying glyoxylic and glycolic acids.
- Nuclear Magnetic Resonance (NMR) spectroscopy for structural identification.
- Enzymatic hydrolysis of high-molecular-weight fractions.
Main Results:
- Water-soluble NCMC was successfully obtained by controlling the molar ratio of glyoxylic acid to chitosan amino groups.
- Structural analysis revealed partial N-mono-carboxymethylation (0.3), N,N-dicarboxymethylation (0.3), and N-acetylation, influenced by the chitosan's deacetylation degree.
- The synthesis was effective even with high glycolic acid concentrations.
- Enzymatic treatment prevented gel formation during storage and precipitation upon addition of antimicrobial agents.
Conclusions:
- Optimized reaction conditions yield water-soluble NCMC with controlled carboxymethylation.
- Enzymatic modification enhances the stability and processability of NCMC solutions.
- This water-soluble derivative holds potential for biomedical and other industrial applications.