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Fluorescent labelling as a tool for identifying and quantifying nanoplastics.

P Merdy1, A Bonneau1, F Delpy1

  • 1Université de Toulon, Aix Marseille Univ., CNRS, IM2NP Toulon France patricia.merdy@univ-tln.fr.

RSC Advances
|November 26, 2024
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Summary
This summary is machine-generated.

Researchers developed a fluorescent labeling method to detect and identify nanoplastics in natural samples. Fluorescein proved most effective, distinguishing five common plastic types by analyzing fluorescence spectra.

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Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Materials Science

Background:

  • Microplastic research is advancing, but nanoplastic detection in natural environments remains difficult.
  • Nanoplastics pose environmental risks due to their small size and widespread presence.

Purpose of the Study:

  • To develop a specific method for detecting and identifying nanoplastics using fluorescent labeling.
  • To evaluate the effectiveness of different fluorescent molecules for nanoplastic discrimination.

Main Methods:

  • Six common plastic types (polypropylene, low-density polyethylene, high-density polyethylene, polystyrene, polyethylene terephthalate, and polyvinyl chloride) were used as nanoparticles.
  • Nanoparticles were stained with four fluorescent molecules: cyanine-3, rhodamine-6G, fluorescein, and Vat Red 15.
  • Detection was achieved by analyzing 3D fluorescence spectra to identify spectral shifts caused by fluorophore adsorption.

Main Results:

  • Adsorption of fluorescent molecules induced peak shifts in fluorescence spectra, enabling nanoplastic identification.
  • Fluorescein effectively discriminated polypropylene, polyvinyl chloride, high-density polyethylene, low-density polyethylene, and polystyrene.
  • Rhodamine-6G, cyanine-3, and Vat Red 15 showed varying degrees of success in discriminating specific plastic types.

Conclusions:

  • Fluorescent labeling combined with 3D fluorescence spectral analysis offers a promising approach for nanoplastic detection.
  • Fluorescein demonstrates high potential for identifying multiple nanoplastic types in environmental samples.
  • Further research can optimize this method for comprehensive nanoplastic monitoring.