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Bile salt-phospholipid aggregation at submicellar concentrations.

Rebekah Baskin1, Laura D Frost

  • 1Department of Chemistry, Georgia Southern University, Statesboro, GA 30460, United States.

Colloids and Surfaces. B, Biointerfaces
|November 24, 2007
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Summary

Bile salts like sodium cholate and taurodeoxycholate form aggregates with phospholipids even below their critical micelle concentrations. This study reveals small, primary micellar aggregates in these solutions.

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Area of Science:

  • Biochemistry
  • Physical Chemistry
  • Materials Science

Background:

  • Bile salts are crucial for lipid digestion and absorption.
  • Understanding bile salt-phospholipid interactions is key to biological processes.
  • Previous studies focused on concentrations above critical micelle concentrations (CMCs).

Purpose of the Study:

  • To investigate bile salt aggregation with phospholipids below CMCs.
  • To characterize the nature of these sub-CMC aggregates.
  • To determine the aggregation number of bile salt-phospholipid complexes.

Main Methods:

  • Utilized a fluorescently labeled phospholipid, NBD-C(6)-HPC, to monitor aggregation.
  • Titrated NBD-C(6)-HPC solutions with sodium cholate (NaC) and taurodeoxycholate (NaTDC).
  • Analyzed fluorescence changes and applied the Hill equation for cooperative aggregation modeling.

Main Results:

  • Both NaC and NaTDC induced significant fluorescence changes below their CMCs.
  • Evidence suggests bile salts interact with the phospholipid's hydrocarbon tail, not the fluorescent probe.
  • The Hill equation analysis indicated a minimum aggregation number of approximately 2 for both bile salts.

Conclusions:

  • Bile salt-phospholipid aggregates form at sub-micellar concentrations.
  • These findings support the existence of primary micellar aggregates in these systems.
  • The small aggregation number suggests specific, low-stoichiometry interactions below CMCs.