From PET Bottles to Protein: The Science of Edible Plastic

The process begins by subjecting plastic and agricultural biomass to oxidative hydrothermal dissolution, an environmentally friendly technique that breaks down solid materials into water-soluble fragments. These fragments serve as a carbon-rich feedstock for specialized yeast strains. Through metabolic engineering, these microorganisms convert the liquid mixture into essential food components, including fats and proteins. To ensure palatability, researchers introduced specific yeast strains capable of producing vanillin for flavor and beta-carotene for color and nutritional value. The resulting biomass is combined with fiber, starch, and sweeteners before being shaped by a 3D printer and microwaved into its final form.

While the team behind the project, led by associate professor Lahiru Jayakody, reports that the cookies have performed well in aroma tests, human consumption remains pending official safety approvals. Beyond the technical hurdles, the researchers acknowledge a significant psychological barrier: convincing the public to consume food derived from synthetic polymers. Initially developed for the NASA Deep Space Food Challenge, the project aims to provide sustainable nutrition for astronauts and populations in extreme environments. The team is currently refining the product to improve consumer appeal, with hopes of commercial viability within a few years.