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Phenol Red Thread-based Sampling Procedure for Untargeted Tear Fluid Lipidomics in Biomarker Discovery
Published on: December 12, 2025
Spectroscopic evaluation of human tear lipids
Douglas Borchman1, Gary N Foulks, Marta C Yappert
1Department of Ophthalmology and Visual Science, University of Louisville, 301 E. Muhammad Ali Blvd., Louisville, KY 40202, USA. Borchman@louisville.edu
Chemistry and Physics of Lipids
|May 8, 2007
Summary
Human meibum (ML) and tear lipids (SSL) molecular structures were analyzed. Findings suggest tear components interacting with lipids may reduce tear evaporation, offering insights for dry eye conditions.
Area of Science:
- Ophthalmology
- Biophysics
- Biochemistry
Background:
- Human meibum (ML) and tear lipids (SSL) are crucial for maintaining ocular surface health.
- Understanding their molecular structure and dynamics is key to addressing dry eye disease.
Purpose of the Study:
- To characterize the molecular structure and dynamics of human meibum (ML) and tear lipids (SSL) using spectroscopic methods.
- To investigate the role of lipid interactions in tear film stability and evaporation.
Main Methods:
- Infrared and fluorescence spectroscopies were employed to analyze ML and SSL.
- Spectra were examined for molecular moieties, hydrogen bonding, and temperature-dependent changes.
Main Results:
- ML lipids showed higher concentrations of CC and CH3 groups compared to SSL.
- SSL contained OH groups absent in ML; CO groups in both were not hydrogen-bonded.
- Polar moieties (CO, PO2-) showed minimal temperature-dependent changes, suggesting limited thermodynamic role in phase transitions.
- Tear components bind to SSL, excluding water at the lipid-aqueous interface.
Conclusions:
- Interactions between tear components and SSL at the tear film interface may reduce water evaporation.
- These findings provide a basis for future research into age- and sex-related differences in tear lipids and dry eye.
- The study offers insights into the biophysical mechanisms underlying tear film function.
