Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Saccharide Effect on the Lower Critical Solution Temperature of Poly(organophosphazenes) with Methoxy-poly(ethylene glycol) and Amino Acid Esters as Side Groups

  • Lee, Sang-Beom (Division of Life Science, Korea Institute of Science and Technology) ;
  • Sohn, Youn-Soo (Department of Chemistry, Ewha Womans University) ;
  • Song, Soo-Chang (Division of Life Science, Korea Institute of Science and Technology)
  • Published : 2003.07.20
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Abstract

The lower critical solution temperature (LCST) of thermosensitive poly(organophosphazenes) with methoxypoly(ethylene glycol) (MPEG) and amino acid esters as side groups was studied as a function of saccharide concentration in aqueous solutions of mono-, di-, and polysaccharides. Most of the saccharides decreased the LCST of the polymers, and the LCST decrease was more prominently observed by saccharides containing a galactose ring, such as D-galactose, D-galactosamine and D-lactose, and also the polysacccharide, 1-6-linked D-dextran effectively decreased the LCST of the polymers. Such an effect was discussed in terms of intramolecular hydrogen bonding of saccharides in polymer aqueous solution. The saccharide effect was found to be almost independent on the kinds of the amino acid esters and MPEG length of the polymers. Such a result implies that the polymer-saccharide interaction in aqueous solution is clearly influenced by the structure of sacchardes rather than by that of the polymers. The acid saccharides such as D-glucuronic and D-lactobionic acid increased the LCST, which seems to be due to their pH effect.

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