Scientists Turn Plastic Waste Into Edible Protein Cookies for Mars Missions

Researchers at Southern Illinois University Carbondale showed for the first time that PET plastic can be broken down and fed to engineered yeast to produce proteins, fats and vitamins. The mix was 3D-printed into a protein-rich "µBite" cookie; the team is refining the process for NASA's Deep Space Food Challenge and awaiting FDA clearance for human taste trials.

• PET is broken down at 250–280 °C and about 2000 psi without catalysts or toxic byproducts
• Engineered yeast convert plastic-derived carbon into proteins, lipids, acids and vitamins
• A compact bioreactor and 3D printer could supply three astronauts' daily protein needs
• The team is awaiting FDA clearance for human taste trials