SIU Carbondale Team Engineers Yeast to Turn PET Waste into 3D-Printed Protein Cookies

The team first applied a proprietary high-temperature, high-pressure water-and-oxygen process developed by SIU geologist Ken Anderson to depolymerize PET bottles and corn stover into small organic molecules. These feedstocks were then supplied to genetically modified baker’s yeast and other strains programmed to reassemble the carbon into amino acids, lipids, and flavor compounds. The resulting biomass was combined with fiber and starch and extruded into cookies whose safety data remain limited to preliminary microbial and chemical assays.

Presented as an ACS abstract rather than a peer-reviewed paper, the work directly addresses two concrete problems: terrestrial plastic accumulation and the logistical impossibility of resupplying deep-space crews. By coupling waste upcycling with microbial food synthesis, the approach could reduce both landfill volumes and the mass of provisions launched from Earth, yet the absence of published nutritional profiles or toxicology screens leaves open questions about long-term human consumption.

Next steps hinge on institutional review board approval for human sensory panels and scaled bioreactor trials. If those milestones are cleared within two years, pilot systems could be tested in Antarctic stations or simulated Mars habitats; failure to secure regulatory clearance would confine the technology to non-food polymer recycling.