Influence of some reactional parameters on the substitution degree of biopolymeric Schiff bases prepared from chitosan and salicylaldehyde

Some reactional parameters as mol ratio (salicylaldehyde:free amino groups), reaction time and temperature were investigated in order to improve the substitution degree (DS) in the preparation of biopolymeric Schiff bases from chitosan. In this case, the reaction of chitosan and salicylaldehyde was...

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Bibliographic Details
Published inCarbohydrate polymers Vol. 65; no. 4; pp. 557 - 561
Main Authors Guinesi, Luciana Simionatto, Cavalheiro, Éder Tadeu Gomes
Format Journal Article
LanguageEnglish
Published Oxford Elsevier Ltd 13.09.2006
Elsevier Science
Subjects
Applied sciences
Chitosan
Degree of substitution
Exact sciences and technology
Natural polymers
Physicochemistry of polymers
Schiff bases
Starch and polysaccharides
Schiff bases
Chitosan
Degree of substitution
Condensation reaction
Molecular structure
Experimental study
Optimization
Operating conditions
Structure processing relationship
Chemical modification
Chitosan derivatives
Phenols
Oside polymer
Growth from solution
Benzaldehyde derivatives
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Summary:Some reactional parameters as mol ratio (salicylaldehyde:free amino groups), reaction time and temperature were investigated in order to improve the substitution degree (DS) in the preparation of biopolymeric Schiff bases from chitosan. In this case, the reaction of chitosan and salicylaldehyde was used as a probe system in order to produce the Schiff base. The use of 50% (mol/mol) salicylaldehyde excess, reaction time of 18 h and temperature of 55 °C permitted to obtain a DS of 60% without evidences of hydrolysis of the biopolymeric matrix or changes in its acetylation degree.
ISSN:0144-8617
1879-1344
DOI:10.1016/j.carbpol.2006.01.030