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Labeling of Amine-Modified Material Surfaces with PFB-Fluorescein.

Kaja Jaskot1, Angelika Maria Mielcarek2, Łukasz Popenda1

  • 1NanoBioMedical Centre, Adam Mickiewicz University, Poznań, Poland.

Nanotechnology, Science and Applications
|March 31, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a new method for fluorescently labeling surfaces using 5-(Pentafluorobenzoylamino) fluorescein (PFB-F). The PFB-F dye can be easily attached to amine-modified materials at room temperature for stable surface visualization.

Keywords:
C. elegansPFB-Fconjugate chemistryfluoresceinmaterial surfacenanoparticles

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Biotechnology

Background:

  • Fluorescent labeling is crucial for visualizing and tracking materials.
  • 5-(Pentafluorobenzoylamino) fluorescein (PFB-F) is a fluorescent dye with a reactive linker.
  • Previous applications of PFB-F focused on biomolecules, not surface labeling.

Purpose of the Study:

  • To develop a straightforward method for attaching PFB-F to amine-modified surfaces.
  • To explore the potential of PFB-F for stable surface labeling applications.
  • To demonstrate the versatility of PFB-F in material science.

Main Methods:

  • Utilized nuclear magnetic resonance (NMR) and thin layer chromatography (TLC) to analyze the reaction mechanism.
  • Conjugated PFB-F with poly-L-lysine to assess reactivity with polymers.
  • Labeled silica nanoparticles (SiNPs) with PFB-F for in vivo tracking in nematode worms.

Main Results:

  • Confirmed covalent bonding of PFB-F to primary amines via nucleophilic aromatic substitution (SNAr).
  • Successfully achieved stable fluorescent labeling of amine-modified surfaces and polymers.
  • Demonstrated successful in vivo tracking of PFB-F labeled SiNPs in nematode worms.

Conclusions:

  • PFB-F is a versatile and effective reagent for stable surface labeling.
  • The developed method offers a simple and efficient way to functionalize materials.
  • This work opens new avenues for PFB-F applications in material design and bioimaging.