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Prolonged survival time of Daphnia magna exposed to polylactic acid breakdown nanoplastics

PLoS ONE 2023 12 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count. Score: 50 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.

Mikael T. Ekvall, Mikael T. Ekvall, Mikael T. Ekvall, Egle Kelpsiene Egle Kelpsiene Egle Kelpsiene Mikael T. Ekvall, Egle Kelpsiene Mikael T. Ekvall, Mikael T. Ekvall, Egle Kelpsiene Mikael T. Ekvall, Mikael T. Ekvall, Mikael T. Ekvall, Martin Lundqvist, Melinda Rydberg, Tommy Cedervall, Tommy Cedervall, Tommy Cedervall, Melinda Rydberg, Martin Lundqvist, Egle Kelpsiene Mikael T. Ekvall, Tommy Cedervall, Egle Kelpsiene Egle Kelpsiene Martin Lundqvist, Martin Lundqvist, Tommy Cedervall, Mikael T. Ekvall, Mikael T. Ekvall, Martin Lundqvist, Egle Kelpsiene Mikael T. Ekvall, Tommy Cedervall, Tommy Cedervall, Mikael T. Ekvall, Martin Lundqvist, Egle Kelpsiene Martin Lundqvist, Mikael T. Ekvall, Tommy Cedervall, Tommy Cedervall, Tommy Cedervall, Tommy Cedervall, Tommy Cedervall, Martin Lundqvist, Tommy Cedervall, Tommy Cedervall, Martin Lundqvist, Tommy Cedervall, Tommy Cedervall, Tommy Cedervall, Martin Lundqvist, Tommy Cedervall, Tommy Cedervall, Tommy Cedervall, Egle Kelpsiene

Summary

Researchers examined the effects of nanoplastics from degraded polylactic acid (PLA) products on Daphnia magna water fleas and found that the breakdown particles actually extended the organisms' survival time rather than causing harm. Chemical analysis revealed that PLA breakdown products were oxidized and contained aldehydes or ketones. The study suggests that while PLA is marketed as biodegradable, its breakdown into nanoplastics may have unexpected biological effects that warrant further investigation.

Polymers

PLA

Models

Daphnia

Polylactic acid nanoparticles (PLA NPs) according to food and drug administration are biodegradable and biocompatible polymers that have received a lot of attention due to their natural degradation mechanism. Although there is already available information concerning the effects of PLA microplastic to aquatic organisms, the knowledge about PLA NPs is still vague. In the present study, we analyzed the chemical composition of engineered PLA NPs, daily used PLA items and their breakdown products. We show that PLA breakdown products are oxidized and may contain aldehydes and/or ketones. The breakdown produces nanosized particles, nanoplastics, and possibly other small molecules as lactide or cyclic oligomers. Further, we show that all PLA breakdown nanoplastics extended the survival rate in Daphnia magna in an acute toxicity assay, however, only PLA plastic cup breakdown nanoplastics showed a significant difference compared to a control group.

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