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A fluorescence study of the ternary system lecithin-sodium deoxycholate-water showing structural transformations

Authors
Journal
FEBS Letters
0014-5793
Publisher
Wiley Blackwell (John Wiley & Sons)
Publication Date
Volume
187
Issue
2
Identifiers
DOI: 10.1016/0014-5793(85)81269-2
Keywords
  • Ternary System
  • Structural Transformation
  • Fluorescence Method
  • Rhodamine-B

Abstract

Abstract A fluorescence method was applied to study structural transitions occurring in the ternary system lecithinsodium deoxycholate-water. The method is based on binding of the hydrophilic probe rhodamine-B to the structures at molar ratios of lecithin and deoxycholate ( L/D) ranging from 0.16 to 10.7. The relationship between the fluorescence intensity and L/D ratio was sharply altered at molar ratios of 0.9 and 4.5. Thus three L/D regions could be distinguished and inflection points were estimated for each one. It is suggested that the L/D values of the sharp transitions (0.9 and 4.5) and the inflection points (0.5, 1.5 and 5.5) indicate generation of new types of molecular arrangements in the ternary system.

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