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Lipid artificial tears at a mimetic ocular interface.

Juan Torrent-Burgués1, Javier Hoyo1, Tzanko Tzanov1

  • 1Grup de Biotecnologia Molecular i Industrial, Department of Chemical Engineering, Universitat Politècnica de Catalunya, Rambla Sant Nebridi 22, 08222, Terrassa, Spain.

Chemistry and Physics of Lipids
|May 8, 2021
PubMed
Summary

This study examined lipid tear products at the air/liquid interface, simulating the ocular environment. Albumin and lysozyme proteins significantly influenced lipid film behavior, offering insights for artificial tear formulation.

Keywords:
Elastic modulusLangmuir filmLipid artificial tearOptrex©Subphase influence

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Area of Science:

  • Ocular surface science
  • Materials science
  • Biophysics

Background:

  • Artificial tears often contain lipids to mimic natural tear film.
  • Understanding lipid behavior at the air/liquid interface is crucial for ocular product development.
  • Commercial lipid tear products require characterization for efficacy.

Purpose of the Study:

  • To investigate the surface behavior of commercial lipid tear products.
  • To assess the interaction of tear components with lipid films.
  • To inform the development of improved artificial tear formulations.

Main Methods:

  • Langmuir film balance technique to study lipid films at the air/liquid interface.
  • Surface pressure-area (Pi-A) isotherms and elastic modulus (E) plots were employed.
  • Experiments were conducted with various subphases (NaCl, glucose, albumin, lysozyme) at different temperatures.

Main Results:

  • Two lipid tear products with identical composition showed similar surface behavior.
  • Sodium chloride, albumin, and lysozyme significantly influenced the lipid Langmuir films' surface pressure-area isotherms.
  • Albumin caused a shift to lower areas, while lysozyme induced a shift to higher areas on the isotherm.

Conclusions:

  • The interaction of tear fluid components, particularly proteins, affects lipid film properties.
  • Findings provide valuable data for formulating advanced lipid-based artificial tears.
  • This research can enhance consumer confidence in eye care products.