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Mucin-electrolyte interactions at the solid-liquid interface probed by QCM-D.

Zsombor Feldötö1, Torbjörn Pettersson, Andra Dedinaite

  • 1Department of Chemistry, Surface Chemistry, Royal Institute of Technology, Drottning Kristinas väg 51, SE-10044 Stockholm, Sweden.

Langmuir : the ACS Journal of Surfaces and Colloids
|February 13, 2008
PubMed
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Mucin adsorption varies by surface chemistry, with high affinity on hydrophobic and charged surfaces. Electrolytes induce reversible and irreversible conformational changes in mucin layers, influencing their structure and interactions.

Area of Science:

  • Biomaterials Science
  • Surface Chemistry
  • Biophysics

Background:

  • Mucin adsorption is crucial for understanding biomaterial interactions.
  • Surface properties significantly influence mucin behavior.
  • Electrolyte effects on mucin conformation are not fully understood.

Purpose of the Study:

  • Investigate mucin adsorption on surfaces with varying functional groups (COOH, OH, CH3).
  • Elucidate electrolyte-induced conformational changes in adsorbed mucin layers.
  • Evaluate mucin interaction with cationic surfactants in the presence of electrolytes.

Main Methods:

  • Quartz crystal microbalance with energy dissipation measurements.
  • Surface functionalization of gold substrates.
  • Turbidimetry for mucin-surfactant interactions.

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Main Results:

  • Mucin adsorbed with high affinity to hydrophobic and COOH surfaces, but poorly to OH surfaces.
  • NaCl induced reversible swelling and compaction of mucin layers.
  • CaCl2 and LaCl3 caused irreversible compaction, with LaCl3 effects being more pronounced.
  • Electrolytes screened mucin-DTAB surfactant interactions, with higher cation valency showing a greater effect.

Conclusions:

  • Surface chemistry dictates mucin adsorption affinity.
  • Electrolytes modulate mucin layer conformation and stability based on cation valency.
  • Electrolytes play a role in screening mucin-surfactant associations.