Aggregation and Adsorption Behaviors of Sodium Deoxycholate in Water–Ethylene Glycol Medium

Critical micelle concentrations (cmcs) of sodium deoxycholate (SDC) were determined at 25 °C in water + ethylene glycol (EG) medium (mass fraction of EG, wEG × 102 = 0, 10, 20, 30, 40, 50, and 60) by measuring surface tension, fluorescence emission intensities of pyrene probe, and conductance. Cmc w...

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Bibliographic Details
Published in:Bulletin of the Chemical Society of Japan 2010-01, Vol.83 (11), p.1352-1358
Main Authors: Das, Sujit, Thapa, Uttam, Ismail, Kochi
Format: Article
Language:English
Subjects:
Agglomeration
Conductance
Constants
Ethylene glycol
Isotherms
Mathematical analysis
Sodium
Surface chemistry
Surface tension
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Summary:Critical micelle concentrations (cmcs) of sodium deoxycholate (SDC) were determined at 25 °C in water + ethylene glycol (EG) medium (mass fraction of EG, wEG × 102 = 0, 10, 20, 30, 40, 50, and 60) by measuring surface tension, fluorescence emission intensities of pyrene probe, and conductance. Cmc was also determined in the presence of NaCl from the surface tension isotherms, and counter ion binding constants (β) of SDC were evaluated by applying the Corrin–Harkins equation and slope-ratio method. The value of β in water is about 0.18 and becomes almost half of this value in water + EG. Surface excess at the cmc decreases as the EG amount increases, but increases on adding NaCl. Gordon parameter and ratio of surface tension of the medium to that of the surfactant solution at the cmc are used to represent solvophobicity.
ISSN:0009-2673
1348-0634
1348-0634
DOI:10.1246/bcsj.20100152