Document Detail


Inhibitory effects of multicomponent, phosphonate-grafted, zwitterionic chitosan biomacromolecules on silicic acid condensation.
MedLine Citation:
PMID:  18947251     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
This article reports the inhibitory effects of phosphonated chitosan (PCH, synthesized from chitosan (CHS) by a Mannich-type reaction) on the in vitro silicic acid condensation. In particular, the ability of PCH to retard silicic acid condensation in aqueous supersaturated solutions at circumneutral pH is studied. Furthermore, the effect of anionic carboxymethyl inulin (CMI) polyelectrolyte on the inhibitory activity of PCH is systematically studied. It was discovered that when PCH is added in dosages up to 150 ppm, it can inhibit silicic acid condensation, thereby maintaining soluble silicic acid up to 300 ppm (for 8 h, from a 500 ppm initial stock solution). The addition of CMI to working solutions that already contain PCH can further enhance the inhibitory action of PCH. A combination of 150 ppm PCH and 100 ppm CMI maintains 400 ppm soluble silicic acid for 8 h. PCH and CMI combinations also affect colloidal silica particle morphology.
Authors:
Konstantinos D Demadis; Antonia Ketsetzi; Konstantinos Pachis; Viviana M Ramos
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-10-24
Journal Detail:
Title:  Biomacromolecules     Volume:  9     ISSN:  1526-4602     ISO Abbreviation:  Biomacromolecules     Publication Date:  2008 Nov 
Date Detail:
Created Date:  2008-11-12     Completed Date:  2008-12-24     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100892849     Medline TA:  Biomacromolecules     Country:  United States    
Other Details:
Languages:  eng     Pagination:  3288-93     Citation Subset:  IM    
Affiliation:
Crystal Engineering, Growth and Design Laboratory, Department of Chemistry, University of Crete, Voutes Campus, Heraklion, Crete GR-71003, Greece. demadis@chemistry.uoc.gr
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MeSH Terms
Descriptor/Qualifier:
Chitosan / chemical synthesis,  chemistry*
Phosphonic Acids / chemistry*
Silicic Acid / chemistry*
Silicon Dioxide
Solutions
Chemical
Reg. No./Substance:
0/Phosphonic Acids; 0/Solutions; 1343-98-2/Silicic Acid; 7631-86-9/Silicon Dioxide; 9012-76-4/Chitosan

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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