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An NMR Self-Diffusion Study of the Interaction between Sodium Hyaluronate and Tetradecyltrimethylammonium Bromide
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- Björling, Mikael (author)
- Physical Chemistry, Department of Chemistry, Royal Institute of Technology, Sweden; Physical Pharmaceutical Chemistry, Uppsala University, Biomedical Center, Uppsala, Sweden; Royal Institute of Technology, Sweden
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- Herslöf-Björling, A. (author)
- Physical Chemistry, Department of Chemistry, Royal Institute of Technology, Sweden; Physical Pharmaceutical Chemistry, Uppsala University, Biomedical Center, Uppsala, Sweden; Uppsala University, Sweden
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- Stilbs, P. (author)
- Physical Chemistry, Department of Chemistry, Royal Institute of Technology, Sweden; Physical Pharmaceutical Chemistry, Uppsala University, Biomedical Center, Uppsala, Sweden; Royal Institute of Technology, Sweden
- (creator_code:org_t)
- 2002-05-01
- 1995
- English.
- In: Macromolecules. - : American Chemical Society (ACS). - 0024-9297 .- 1520-5835. ; 28:20, s. 6970-6975
- Journal article (peer-reviewed)
Abstract
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- A decrease of the NMR self-diffusion coefficient of sodium hyaluronate (NaHy) upon increasing tetradecyltrimethylammonium bromide (TTAB) concentration in 202 mM NaCl (just enough to attain single phase conditions irrespective of the TTAB concentration) is interpreted in terms of the formation of NaHy–TTAB complexes containing several NaHy chains. The complexes are judged to be induced by multiple-site electrostatic condensation of TTAB micelles onto the Hy chains. Thus, the TTAB micelles may act as bridging points between, and within, the NaHy chains. For a 1% wt NaHy solution, at 202 mM NaCl, the fraction of adsorbed TTAB has a maximum at 10 mM TTAB where an estimated 54% of all the added TTAB is bound. At 70 mM TTAB, the fraction of bound TTAB has decreased to 42%. The decrease of the binding constant with increasing TTAB concentration is attributed to a more efficient electrostatic screening; i.e., the ionic strength (due to uncondensed species) increases. The observed NaHy–TTAB complexes are likely to be precursors of the precipitated phase formed at lower salt concentrations.
Subject headings
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
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