Fluorescent nanoplastics: What steps are needed towards a representative toolkit?

Area of Science:

• Environmental Science
• Analytical Chemistry
• Materials Science

Background:

• Plastic degradation yields microplastics (MPs) and nanoplastics (NPs), posing environmental and health risks.
• Accurate detection and identification of NPs are challenging, hindering risk assessment.
• Fluorescence-based methods are crucial for toxicological, exposure, and environmental studies of NPs.

Purpose of the Study:

• To critically review strategies for using or synthesizing fluorescent NPs for exposure and imaging studies.
• To identify current knowledge gaps and methodological limitations in fluorescent NP research.
• To provide recommendations for creating representative fluorescent model NP particles.

Main Methods:

• Literature review of fluorescent microplastic and nanoplastic research.
• Analysis of current strategies for synthesizing and utilizing fluorescent NPs.
• Identification of limitations in commercially available fluorescent polystyrene beads and dye-loading methods.

Main Results:

• Prevailing strategies for fluorescent NP synthesis (e.g., using polystyrene beads and dye loading) are often inadequate and not environmentally representative.
• Promising alternative methods for creating fluorescent NPs have emerged in recent years.
• Significant knowledge and methodological gaps exist in the field of fluorescent NP research.

Conclusions:

• Researchers need improved methods for generating fluorescent NPs that accurately mimic environmental particles.
• The review offers a roadmap to guide researchers in selecting or developing appropriate fluorescent NP models for their specific applications.
• Addressing detection and synthesis challenges is crucial for advancing NP research and risk assessment.