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Ultrafast Bulk Degradation of Polylactic Acid by Artificially Cultured Diatom Frustules
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Researchers found that adding diatom frustules (tiny silica shells from algae) to polylactic acid (PLA) bioplastic accelerates its degradation by more than eightfold. This discovery could help address the problem of slow breakdown of PLA products in natural environments.
Abstract In the field of governing our “Plastic Planet”, polylactic acid (PLA) has been considered to be a promising and ecologically friendlier alternative to traditional petroleum-based plastics. However, PLA-based products degrade slowly in the natural environment, likely resulting in a large accumulation of PLA waste worldwide in the near future. Herein, we have incorporated artificially cultured diatom frustules (DFs) into PLA, and found an improvement of more than eightfold on the degradation rate, from more than 24 months to 3 months or even less, as compared with the pure PLA. Mechanistic investigations illustrate that DFs change the degradation behavior of PLA from surface erosion to bulk erosion by the induced microfibril crystals. Simulation analysis verifies that the unstable crack propagation inside the PLA matrix greatly accelerates the degradation. The method developed in this work provides an efficient way to achieve rapid and controllable degradation of biodegradable polymers for the urgent and widespread usage of green plastic productions.
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Polylactic acid synthesis, biodegradability, conversion to microplastics and toxicity: a review
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Researchers reviewed polylactic acid (PLA), a popular plant-based "biodegradable" plastic used in packaging and agriculture, finding that while it breaks down inside the body, it does not fully degrade under natural outdoor or aquatic conditions — and in fact fragments into microplastics faster than conventional petroleum-based plastics. This challenges the assumption that bioplastics are a straightforward environmental solution.
Microbial Degradation of Polylactic Acid Bioplastic
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This review covers how microorganisms degrade polylactic acid (PLA) bioplastic under different environmental conditions. Understanding PLA biodegradation is important for assessing whether PLA products actually break down as intended in real-world environments rather than persisting as microplastics.
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Researchers tested whether planktonic protists such as nanoflagellates and ciliates could enhance the degradation of biodegradable PLGA microplastics in seawater from the Baltic Sea. The study found that microbial plankton actively ingested PLGA particles and accelerated their degradation compared to sterile water controls, suggesting that biological activity plays a meaningful role in breaking down biodegradable plastics in marine ecosystems.
State of the art on biodegradability of bio-based plastics containing polylactic acid
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This review examines whether bio-based plastics made from polylactic acid (PLA) actually break down in the environment as intended. While certain microorganisms can degrade PLA, the process is slow and depends heavily on conditions like temperature and moisture. The findings matter because if bio-based plastics do not fully break down, they can still fragment into microplastics, posing many of the same environmental and health risks as conventional plastics.
Unraveling the role of natural and pyrogenic dissolved organic matter in photodegradation of biodegradable microplastics in freshwater
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Researchers investigated how dissolved organic matter from natural sources versus biochar affects the breakdown of biodegradable polylactic acid (PLA) microplastics in sunlight. Naturally sourced organic matter accelerated PLA degradation nearly twice as much as biochar-derived matter by generating more reactive oxygen species, suggesting that the type of organic matter in a waterway significantly influences whether biodegradable plastics actually break down.
Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.