Aggregation behavior of sodium deoxycholate and its interaction with cetyltrimethylammonium bromide in aqueous solution studied by NMR spectroscopy
| Autor: | You-Ru Du, Ai-hong Liu, Maili Liu, Shizhen Mao |
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| Rok vydání: | 2008 |
| Předmět: |
Chromatography
Aqueous solution Polymers and Plastics Proton Chemistry Hydrogen bond Chemical shift Nuclear magnetic resonance spectroscopy chemistry.chemical_compound Colloid and Surface Chemistry Bromide Materials Chemistry Physical chemistry Molecule Physical and Theoretical Chemistry Spectroscopy |
| Zdroj: | Colloid and Polymer Science. 286:1629-1636 |
| ISSN: | 1435-1536 0303-402X |
| Popis: | In pure sodium deoxycholate (NaDC) dilute solution, the transverse relaxation times (T (2)) of nearly all proton signals of NaDC obey single-exponential decay, with exception for proton at 3-position (H3) that decays in a two-exponential manner. The two components with different mobility of H3 of NaDC indicate that the molecules are probably associated in head-to-tail pairs via hydrogen bonds in dilute solution. In the mixed NaDC/cetyltrimethylammonium bromide (CTAB) solutions, the T (2) values of interested NaDC protons are far less than those in pure NaDC solution, especially when the concentrations of the two components are close to equal-molar. The results of self-diffusion coefficients and the chemical shifts confirm further that the strong interaction occurs between the two components in mixed solutions, especially for equal-molar condition. The arrangement of the mixed aggregates can be speculated for the cross-peaks of proton pairs occurring between NaDC and CTAB molecules in two-dimensional and rotating frame nuclear Overhauser enhancement spectroscopy spectra. |
| Databáze: | OpenAIRE |
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