Plastic recycling has moved beyond producing new polymers: it can now directly feed humans. A team at Southern Illinois University Carbondale has developed a process that converts PET bottles and plant waste into edible cookies, merging waste management with food security. The project, named µBites (microbites), marks a qualitative leap from previous research like the conversion of PVC into engine oil, shifting the focus from industrial lubrication to direct nutrition.

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From agricultural waste to nutritious ingredients

The process begins with oxidative hydrothermal dissolution of used plastic bottles and corn stalks, breaking down the materials into components digestible by microorganisms. These nutrients are then fed to yeast genetically modified using CRISPR technology. The microorganism transforms waste carbon into proteins, fats, organic acids, and vanillin, along with beta-carotene that the body can convert into vitamin A. The addition of fibers and sweeteners completes the mixture, which is then extruded through a 3D printer to shape the cookies.

OF MICE AND raMEN: Microbe Cookies — https://ofmiceandramen.blogspot.com/2018/05/microbe-cookies.html

Institutional approval and sensory testing

The researchers will present their findings at the American Chemical Society's fall meeting in Chicago. The team, led by Sandhya Jayasekara, is now awaiting formal university approval to taste the product. Jayasekara describes the aroma as "pleasant and appealing," confirming both the safety and flavor of the compound. The initiative aims to demonstrate that plastic waste can serve as a carbon resource for producing functional foods, addressing both pollution and food scarcity simultaneously.