Southern Illinois University Carbondale Scientists Create Edible Cookies from Plastic Waste for Astronauts
Scientists at Southern Illinois University Carbondale, led by microbiologist Lahiru Jayakody, have developed edible cookies, dubbed 'µBites,' from plastic waste as part of a NASA-led Deep Space Food Challenge. This innovative process involves breaking down waste plastics, such as polyethylene terephthalate (PET) from water bottles, and agricultural waste into smaller molecules. These molecules are then fed to genetically engineered microbes, which metabolize them into acids, fats, and proteins. After adding starch, fiber, and a sweetener, the resulting substance is 3D-printed into high-protein cookies. The team collaborated with microbiologist Sandhya Jayasekra to engineer microbes that produce vanillin for flavor and beta carotene for nutritional value, which the body converts into vitamin A. The process, called oxidative hydrothermal dissolution (OHD), uses water and oxygen under specific conditions to break down carbon-carbon bonds in plastics, producing minimal CO2 as a byproduct.