Insect-mediated polystyrene (PS) degradation: Mechanisms, efficiency, ecological impacts, and application prospects

Area of Science:

• Environmental Science
• Microbiology
• Biotechnology

Background:

• Polystyrene (PS) pollution poses significant ecological and health risks due to its slow degradation.
• Insects and their gut microbiota offer a promising biological solution for PS biodegradation.
• Understanding the mechanisms and limitations is crucial for developing effective remediation strategies.

Purpose of the Study:

• To systematically review insect species capable of PS degradation.
• To elucidate the roles of gut microbiota and enzyme systems in PS breakdown.
• To analyze influencing factors, ecotoxicological effects, and application potential of insect-mediated PS remediation.

Main Methods:

• Literature review of studies on insect-mediated PS biodegradation.
• Analysis of multi-stage degradation mechanisms: physical activation, enzymatic oxidation, depolymerization-mineralization, and bioassimilation.
• Examination of influencing factors (PS properties, insect stage) and ecotoxicological impacts.

Main Results:

• Insects like Tenebrio molitor, Zophobas atratus, and Galleria mellonella degrade PS via gut microbial symbiosis.
• PS degradation involves surface modification, molecular weight reduction, and carbon mineralization or assimilation.
• Significant methodological heterogeneity and lack of standardized validation hinder comparability of current research.

Conclusions:

• Insect-gut microbiota systems present a viable green approach for polystyrene remediation.
• Standardized experimental protocols and validated methods (e.g., isotope tracing) are essential for reliable PS degradation assessment.
• Further research is needed to optimize and apply this biodegradation process effectively.