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Fluorescence Recovery after Merging a Droplet to Measure the Two-dimensional Diffusion of a Phospholipid Monolayer
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Published on: October 15, 2015

Dye diffusion at surfaces: charge matters.

Charlisa R Daniels1, Carmen Reznik, Christy F Landes

  • 1Department of Chemistry, Rice University, Houston, Texas 77251, USA.

Langmuir : the ACS Journal of Surfaces and Colloids
|February 19, 2010
PubMed
Summary
This summary is machine-generated.

Cationic dyes interacting with glass surfaces skew diffusion measurements. Anionic dyes are unaffected, offering more reliable surface proximity studies for researchers.

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Published on: January 25, 2020

Area of Science:

  • Physical Chemistry
  • Surface Science
  • Analytical Chemistry

Background:

  • Fluorescent dye diffusion near surfaces is crucial for understanding molecular interactions.
  • Surface charge and dye charge can significantly influence diffusion behavior.
  • Accurate measurement of diffusion requires minimizing or accounting for surface effects.

Purpose of the Study:

  • To quantify the impact of glass surface interactions on fluorescent dye diffusion.
  • To compare the behavior of cationic and anionic fluorescent dyes near a glass surface.
  • To identify strategies for mitigating surface-induced diffusion artifacts.

Main Methods:

  • Utilized fluorescence correlation spectroscopy (FCS) and single molecule burst analysis.
  • Employed a three-axis piezo stage for precise control of distance from the surface.
  • Conducted experiments with cationic and anionic dyes in various electrolyte concentrations.

Main Results:

  • Cationic dyes exhibited attractive interactions with the glass surface, altering diffusion up to 1.0 micrometer.
  • Coulombic attraction led to rare, long-lived association events, causing irreproducible diffusion values for cationic dyes.
  • Anionic dyes showed no depth-dependent diffusion, indicating minimal surface interaction.

Conclusions:

  • Cationic dye-surface interactions significantly affect diffusion measurements and require careful consideration.
  • Adding electrolytes can mitigate detrimental surface interactions for cationic probes.
  • Anionic dyes are preferable for accurate diffusion studies near glass surfaces due to their lack of interaction.