Researchers at the University of Edinburgh have developed a pioneering method to convert waste plastic bottles into L-DOPA, the primary drug used to treat Parkinson’s disease.
The breakthrough, published in Nature Sustainability and widely reported on March 16–17, 2026, is the first time a natural biological process has been engineered to transform plastic waste into a therapeutic for a neurological condition.
Parkinson’s disease affects millions worldwide, causing tremors, stiffness, and movement difficulties due to the loss of dopamine-producing brain cells.
L-DOPA (levodopa) is the frontline treatment because it crosses into the brain and converts to dopamine, helping restore normal movement.
Currently, L-DOPA is made from petroleum-based chemicals, contributing to carbon emissions and relying on finite fossil fuels.
The Edinburgh team, led by Professor Stephen Wallace from the School of Chemistry, used genetically modified E. coli bacteria to break down polyethylene terephthalate (PET; the plastic in most bottles and food packaging) into a chemical called terephthalic acid.
The engineered bacteria then carry out a series of biological reactions to turn that terephthalic acid into L-DOPA.
This process is more sustainable because it repurposes plastic waste (of which the world produces around 50 million tonnes of PET each year) into a valuable medicine.
It also reduces the need for new chemical synthesis from oil, cutting environmental impact and potentially lowering costs in the future.
The method is still in the laboratory stage, but the researchers say it demonstrates how engineering biology can solve two major problems at once: plastic pollution and the need for greener pharmaceutical production.
They hope to scale it up and adapt it for other medicines, showing that waste can become a resource rather than a burden.
For countries across Africa, Asia, Latin America, and beyond, where plastic pollution is a growing challenge and access to affordable Parkinson’s treatment can be limited, this kind of innovation offers long-term promise. It highlights how science can turn environmental problems into solutions for health.
