Journal
CARBOHYDRATE POLYMERS
Volume 71, Issue 4, Pages 672-681Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2007.07.019
Keywords
alginate; chitosan; multilayers; layer interpenetration; DW-RICM
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Polyelectrolyte multilayers of alginate and either poly-L-lysine or chitosan have been studied with dual wavelength reflection interference contrast microscopy (DW-RICM). Alginates with different ratios of the two monomer residues, P-D-mannuronic acid (M) and alpha-L-guluronic acid (G) were included to study possible effects of specific divalent ions selected from their ability to influence gelation of alginate. Measurements of multilayer thickness revealed the importance of the preparation conditions. The multilayer thickness was reduced with increasing ionic strength following preparation, suggesting a dominance of an ordinary screening of the alginate component. The results indicate that the interaction between alginate and chitosan are different from that between alginate and poly-L-lysine, with the latter appearing to be more of a hit-and-stick reaction while rearrangements during the adsorption process is occurring to a larger extent in the preparation of the chitosan-alginate multilayers. (c) 2007 Elsevier Ltd. All rights reserved.
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