Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/194435
Type: Artigo de periódico
Title: Some Studies Of Crosslinking Chitosan-glutaraldehyde Interaction In A Homogeneous System.
Author: Monteiro, O A
Airoldi, C
Abstract: Chitosan dissolved in acetic acid reacted with glutaraldehyde solution, ranging in concentration from 0.10 to 25.0 x 10(-2) mol dm3. The modified polymers were characterized by means of carbon, hydrogen and nitrogen elemental analysis, scanning electron microscopy, X-ray diffractometry, 13C nuclear magnetic resonance (NMR), infrared and Raman spectroscopies. The uptake of metallic cations in aqueous medium was checked through copper. The obtained data from 13C NMR, infrared and Raman spectroscopies evidenced the formation of an ethylenic double bond in the chitosan glutaraldehyde interaction. These data suggest that free pendant amine groups of chitosan polymer interact with the aldehydic group of the glutaraldehyde to form stable imine bonds, due to the resonance established with adjacent double ethylenic bonds. The crosslinking is formed by the nonuniform length of chains and by terminal unities. The crosslinking formation can involve two chitosan unities belonging, or not, to the same polymeric chain. The sequence of reactions was established for a chitosan:glutaraldehyde molar proportion of 1:20. The degree of crystallinity and particle size decreased as the amount of glutaraldehyde was increased in the polymer. Physical and chemical properties are not just affected for the chitosan glutaraldehyde reaction, but are also affected strongly by the dissolution of the natural chitosan.
Subject: Acetic Acid
Acetylation
Adsorption
Carbon
Carbon Isotopes
Chitin
Chitosan
Cross-linking Reagents
Glutaral
Hydrogen
Magnetic Resonance Spectroscopy
Microscopy, Electron, Scanning
Nitrogen
Spectrometry, X-ray Emission
Spectrum Analysis
Vibration
Rights: fechado
Identifier DOI: 
Address: http://www.ncbi.nlm.nih.gov/pubmed/10517518
Date Issue: 1999
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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