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Fluorescence Recovery after Merging a Droplet to Measure the Two-dimensional Diffusion of a Phospholipid Monolayer

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Surfactant-induced fluorescence changes in fluorescein dye.

A K Mathur¹, C Agarwal, B S Pangtey

¹Industrial Toxicology Research Centre, P.B. No. 80, M. G. Marg, Lucknow-226001, India.

International Journal of Cosmetic Science

|May 22, 2009

Summary

Surfactants alter fluorescein dye properties. Non-ionic and anionic surfactants cause distinct spectral shifts and intensity changes, while cationic surfactants show complex concentration-dependent effects due to micelle interactions.

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Area of Science:

Photochemistry
Physical Chemistry
Colloid and Surface Chemistry

Background:

Fluorescein dyes are widely used as fluorescent probes.
Surfactants form micelles that can interact with dye molecules.
The spectral properties of dyes can be sensitive to their microenvironment.

Purpose of the Study:

To investigate the effect of different types of surfactants (non-ionic, anionic, cationic) on the spectral characteristics (absorbance and fluorescence) of fluorescein dyes.
To understand the interaction mechanisms between surfactant micelles and fluorescein dye molecules.

Main Methods:

Spectrophotometric analysis of fluorescein dye solutions with varying concentrations of non-ionic, anionic, and cationic surfactants.
Fluorometric analysis to measure fluorescence intensity and spectral shifts.
Analysis of absorbance maxima (Δmax) and intensity changes.

Main Results:

Non-ionic surfactants caused a hypsochromic shift (shorter wavelengths) and decreased absorbance.
Anionic surfactants induced a bathochromic shift (longer wavelengths) with enhanced absorbance and fluorescence.
Cationic surfactants exhibited concentration-dependent effects: initial decrease then increase in absorbance, and initial increase then decrease in fluorescence.

Conclusions:

Surfactant micelles significantly alter the spectral properties of fluorescein dyes.
The observed changes are attributed to the interaction between surfactant micelles and dye molecules, influencing the equilibrium between the colored quinoid and colorless lactone forms of the dye.