Quantifying microplastic ingestion, degradation and excretion in insects using fluorescent plastics.

Area of Science:

• Environmental Science
• Ecotoxicology
• Analytical Chemistry

Background:

• Plastic pollution, particularly microplastics (MPs), poses a significant threat to ecosystems and biota.
• Existing methods for quantifying MPs in animal samples are limited, especially for controlled laboratory studies.
• Accurate quantification is crucial for understanding plastic ingestion, degradation, and elimination in organisms.

Purpose of the Study:

• To propose and validate a comprehensive method for isolating and quantifying fluorescent microplastics (MPs) in animal samples.
• To establish a reliable workflow for laboratory settings to study MP-organism interactions.
• To enable quantification of plastic ingestion, degradation, and elimination in relation to organismal traits.

Main Methods:

• Developed a workflow combining tissue dissection, organic material digestion, and sample filtration.
• Utilized automated imaging techniques for the identification and quantification of fluorescent MPs.
• Applied the method to insects (crickets, *Gryllodes sigillatus*) fed a diet containing fluorescently labeled plastics.

Main Results:

• Successfully isolated and quantified fluorescent MPs from the gut and frass of crickets.
• Demonstrated the efficacy of the combined method for tracking ingested MPs in a model organism.
• Provided a proof of concept for a standardized laboratory approach to microplastic analysis.

Conclusions:

• The proposed method offers a robust and comprehensive workflow for accurate microplastic quantification in laboratory settings.
• This technique facilitates detailed studies on the biological impacts of microplastic pollution.
• The method is adaptable for various animal models and research questions concerning plastic exposure.