Article ? AI-assigned paper type based on the abstract. Classification may not be perfect — flag errors using the feedback button. Tier 2 ? Original research — experimental, observational, or case-control study. Direct primary evidence. Detection Methods Environmental Sources Human Health Effects Remediation Sign in to save

Dynamic formation characteristics and mechanism of molecular components of dissolved organic matter during photoaging of polyamide microplastic

Environmental Toxicology and Chemistry 2025 Score: 48 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.

Fanhao Song, Fanhao Song, Fanhao Song, Qi Zhang, Qi Zhang, Weiying Feng, Weiying Feng, Weiying Feng, Qi Zhang, Qi Zhang, Qi Zhang, Qi Zhang, Tingting Li, Qi Zhang, Tingting Li, Yongze Qi, Qi Zhang, Mingqi Ruan, Tingting Li, Weiying Feng, Mingqi Ruan, Weiying Feng, Weiying Feng, Tingting Li, Qi Zhang, Weiying Feng, Weiying Feng, Qi Zhang, Qi Zhang, Qi Zhang, Qi Zhang, Qi Zhang, Weiying Feng, Tingting Li, Weiying Feng, Qi Zhang, Fengchang Wu Qi Zhang, Fengchang Wu Yuhan Cao, Yuhan Cao, Weiying Feng, Qi Zhang, Weiying Feng, Qi Zhang, Fengchang Wu Qi Zhang, Qi Zhang, Weiying Feng, Fengchang Wu Fengchang Wu Fanhao Song, Fengchang Wu, Fengchang Wu, Yao Zhao, Fengchang Wu Qi Zhang, Fengchang Wu Fengchang Wu Fanhao Song, Qi Zhang, Fengchang Wu Weiying Feng, Fengchang Wu Fanhao Song, Weiying Feng, Fengchang Wu Fengchang Wu Fengchang Wu, Fengchang Wu Fengchang Wu, Fengchang Wu Mingqi Ruan, Mingqi Ruan, Mingqi Ruan, Fengchang Wu Mingqi Ruan, Fengchang Wu Fengchang Wu Fengchang Wu

Summary

Researchers used fluorescence spectroscopy and high-resolution mass spectrometry to track the molecular evolution of dissolved organic matter released from photoaging polyamide microplastics over time, finding a dominant increase in tyrosine-like compounds with progressive irradiation.

Polymers

Microplastic-derived dissolved organic matter (MP-DOM) has attracted widespread attention due to its adverse effects on ecological health. However, the dynamic formation of MP-DOM at the molecular level is not yet fully understood. Herein, the molecular level formation characteristics and mechanism of polyamide-MP-derived DOM (MPPA-DOM) during irradiation were explored using fluorescence spectroscopy. Fourier transform-ion cyclotron resonance mass spectrometry, and parallel factor analysis. The results showed that the time-dependent fluorescence signatures revealed a dominant tyrosine-like component, whose relative abundance increased from 49.63% to 89.62% during irradiation, suggesting a gradual accumulation of protein-related substances. Molecular element analyses of MPPA-DOM revealed the predominance of CHON molecules (78.82%-89.30%), which was attributed to the degradation of the C-N backbone structure. In contrast, CHO molecules exhibited a lower proportion (9.45%) under prolonged irradiation. Aliphatic/peptide-like compounds in MPPA-DOM remained the dominant component with a percentage range of 66.4% to 68.7%, whereas lignin-like compounds slightly increased with the increase of irradiation time. The reduced molecules were dominated in MPPA-DOM with a percentage range of 96.4% to 99.1%. As irradiation increased, the saturated compounds decreased from 91.53% to 82.45% and the unsaturated compounds increased from 7.6% to 14.1%. This study proposed a molecular-level formation mechanism of MPPA-DOM under irradiation. Nitrogen-rich molecules were persistent and highly stable during irradiation, indicating that they could play a more important role in the migration and transformation of MPPA-DOM. The findings in this study will provide support for assessing the potential ecological risks of MP-DOM in water systems.

Read via DOI PubMed

Share this paper

Post Share Share Pin Email