News summary produced by Claude AI
Scientists have created a biodegradable plastic material embedded with dormant microorganisms capable of breaking down the polymer on command. Published in ACS Applied Polymer Materials, the research addresses the mismatch between the short-term utility of many plastic products and their centuries-long persistence in the environment.
The innovation involves embedding dormant spores of Bacillus subtilis bacteria into polycaprolactone, a polymer commonly used in 3D printing and medical applications. The bacteria were engineered to produce two complementary polymer-degrading enzymes that work sequentially. The first enzyme breaks long polymer chains into shorter segments at random intervals, while the second enzyme processes the fragments from their ends, ultimately reducing them to basic monomer building blocks. This two-enzyme approach prevents the material from simply fragmenting into microplastics.
When activated by adding a nutrient solution heated to 122 degrees Fahrenheit, the dormant spores became metabolically active and initiated the degradation process. Complete decomposition occurred within six days, with testing confirming no microplastics remained. The researchers noted that the finished material maintained mechanical properties comparable to conventional polycaprolactone films under normal storage conditions, indicating that incorporating the bacterial spores did not significantly compromise durability or functionality.
Researchers demonstrated practical applicability by manufacturing a wearable plastic electrode from the living material. The device functioned normally and fully degraded within two weeks of activation, suggesting potential use cases for products requiring temporary durability. The team’s next objective involves developing activation methods compatible with aquatic environments, where substantial plastic accumulation occurs.
The researchers believe the underlying strategy could be adapted for various polymer types, potentially extending the technology to widely used disposable plastics. The work received funding from multiple Chinese research and development programs.