SIU Researchers Convert Plastic Waste and Biomass Into Edible Protein Cookies
Developed for the NASA Deep Space Food Challenge, the 'µBites' project uses engineered yeast to upcycle plastic-derived substrates into food additives.
Researchers at Southern Illinois University (SIU) Carbondale have developed a method to convert plastic waste and plant biomass into edible, protein-rich supplements. The project, known as 'µBites,' demonstrates a circular approach to nutrition by using engineered yeast to transform non-biodegradable waste into human-grade food additives.
Presented at an American Chemical Society (ACS) event, the process utilizes a consortium of three yeast strains: Saccharomyces boulardii, S. cerevisiae, and Rhodosporidium toruloides. To create specific additives, the team engineered S. cerevisiae to produce vanillin from ferulic acid, a compound derived from plant biomass. Simultaneously, R. toruloides underwent adaptive laboratory evolution to utilize ethylene glycol—a breakdown product of PET plastic—to produce beta-carotene. The researchers successfully integrated these microbially produced additives into protein-rich cookies that were then 3D-printed.
From Deep Space to Earth
The µBites project was originally developed for the NASA Deep Space Food Challenge. In the context of long-term space travel, resource efficiency is paramount, as astronauts must sustain themselves with limited supplies. By designing a system that can turn waste organic carbon into nutrition, the researchers aimed to solve the logistical hurdles of deep-space missions. This framework now provides a blueprint for addressing terrestrial crises, specifically the intersection of global food insecurity and the proliferation of plastic pollution.
The Impact of Waste Upcycling
This technology represents a shift from traditional waste management to 'upcycling,' where low-value or harmful pollutants are converted into high-value nutritional assets. If the process can be scaled, it offers a dual-purpose solution: mitigating the environmental footprint of PET plastics while providing a sustainable, low-cost source of essential vitamins and protein for food-insecure populations. By utilizing waste as a feedstock, the system reduces the reliance on traditional agricultural land and water resources to produce food additives.
Future Outlook
While the successful 3D-printing of protein cookies proves the concept, the transition from a laboratory setting to industrial-scale production remains the primary hurdle. Future efforts will likely focus on the efficiency of the yeast consortia and the safety of scaling plastic-derived substrates for mass human consumption. For now, the project serves as a proof of concept for a circular economy where plastic waste is no longer a pollutant, but a raw material for nutrition.