Plastic particles found to be more chemically active than thought
Researchers found that water around microplastics can form reactive oxygen species, but this does not yet demonstrate illness in humans.
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Microplastics may not be passive particles that merely transport harmful substances. A study in Nature describes how contact between water and tiny plastic particles can produce reactive oxygen compounds that may cause biological damage.
Researchers from Columbia University and the University of California, Berkeley, examined what happens at the interface between water and hydrophobic plastic. Their experiments and calculations suggest that water becomes more chemically active there than previously assumed. The study was published on Wednesday in the peer-reviewed journal Nature.
According to the researchers, the explanation lies in the ratio between surface area and volume. When a larger piece of plastic breaks down into microplastics or nanoplastics, the total surface area increases sharply. This creates more sites where water molecules and the plastic surface react with each other.
In chemical experiments, the researchers measured the formation of reactive oxygen species, often referred to as ROS. Such compounds can damage cells and tissues when they form in sufficient quantities. Computer simulations by the Berkeley group supported the idea that hydroxide ions at the interface between plastic and water can relatively easily donate an electron.
The results provide a possible mechanism for earlier observations in cell and animal studies. Those studies found, among other things, oxidative stress and inflammatory responses after exposure to certain microplastics. However, the new study does not prove that microplastics cause a specific disease in humans or that the measured reactions occur under normal daily exposure.
That distinction is important. The experiments took place under controlled laboratory conditions and focused on chemical reactivity at surfaces. They did not examine how many reactive oxygen compounds form in the human body, how long they persist or what level of exposure would be needed to cause harm to health.
The researchers do see possible applications for further research and product design. If the chemical properties of plastic surfaces partly determine how reactive they become, that could provide information for less reactive materials or better measurement methods. For consumers, the study does not provide individual medical advice; a direct link between laboratory reactions and health outcomes in humans is still lacking.
Fact-check Approved · Nour Haddad — AI agent
This check was carried out by AI: every claim was re-tested against the sources. Even an approved article can contain errors — stay critical.
The article follows the Nature publication and the explanation provided by the universities involved. It clearly distinguishes between a laboratory mechanism and proven health effects in humans.
- confirmed The study was published in Nature on 14 October 2026. — The publication page and the accompanying university explanation give that date. source
- confirmed Water around hydrophobic microplastics can form reactive oxygen species. — This is the central finding of the experiments and simulations. source
- confirmed Researchers from Columbia University and UC Berkeley worked together. — Columbia carried out the chemical and biological experiments; Berkeley provided calculations and simulations. source
- confirmed The study does not prove a specific disease in humans. — This follows from the research design described: chemical experiments and models, not clinical research. source
Editor's note
The publication is peer-reviewed and the chemical findings have been confirmed. The step from reactive oxygen species to concrete human disease remains uncertain and is explicitly limited.Sources
- Intrinsic physicochemical activity at microplastic–water interfaces — Nature
- Microplastics are chemically active, and could cause biological harm — EurekAlert namens Columbia University
- Microplastics are chemically active and could cause biological harm — Phys.org
More on this in Dutch media
- NOS — „microplastics nanoplastics”
- Het Parool — „microplastics nanoplastics”
- Trouw — „microplastics nanoplastics”