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Updated: Jun 28, 2026

Measuring Membrane Lipid Turnover with the pH-sensitive Fluorescent Lipid Analog ND6

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Towards a fluorescent chemoreceptive lipid membrane-based optode.

U J Krull¹, R S Brown, R F Debono

¹Chemical Sensors Group, Department of Chemistry, Erindale College, University of Toronto, Mississauga Road, Mississauga, Ontario, Canada.

|February 1, 1988

Summary

This study details creating optical chemical sensors using lipid membranes on glass and quartz. These sensors use fluorescence to detect environmental changes, showing promise for sensitive detection applications.

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Area of Science:

Biomolecular engineering
Chemical sensing technology
Materials science

Background:

Lipid membranes exhibit fluorescence sensitive to environmental changes.
Optical chemical sensors require stable, well-defined membrane structures.
Existing sensor technologies can be enhanced by incorporating lipid matrices.

Purpose of the Study:

To establish criteria for depositing ordered lipid monolayers using Langmuir-Blodgett techniques.
To investigate the use of fluorescent probes within lipid membranes for sensing.
To develop an evanescent-wave intrinsic fiber-optic sensor based on lipid membranes.

Main Methods:

Langmuir-Blodgett deposition of phosphatidylcholine-steroid mixtures and stearic acid.
Incorporation of fluorophores (1-anilinonaphthalene-8-sulphonate and 12-(9-anthroyloxy)stearic acid) into lipid monolayers.
Exposure of lipid membranes to aqueous solutions (phloretin, valinomycin) and gas phases (chloroform, n-hexane, N,N-dimethylaniline).
Utilizing evanescent-wave excitation for fiber-optic sensing.

Main Results:

Successful deposition of stable lipid monolayers on glass slides and quartz fibers.
Demonstrated sensitivity of incorporated fluorophores to physical and electrostatic membrane alterations.
Characterized interactions of lipid membranes with various perturbing chemical species.
Reported the development of a functional evanescent-wave intrinsic fiber-optic sensor.

Conclusions:

Langmuir-Blodgett technique provides a reliable method for creating ordered lipid monolayers for sensor applications.
Fluorescence-based monitoring of lipid membranes offers a sensitive approach for detecting chemical and physical changes.
The developed fiber-optic sensor demonstrates the potential of lipid membranes in advanced chemical sensing.