By Fatma Younis
Researchers at the University of Waterloo have developed a plant-based coating for disposable coffee cups that prevents microplastics and hormone-disrupting chemicals from leaching into hot beverages. The innovation addresses growing health concerns as studies reveal microplastics accumulating in human organs.
Health Concerns Over Microplastics
About two-thirds of Americans drink coffee daily, often from disposable cups lined with petroleum-based plastic. These liners shed microplastics and phthalates into the coffee. Recent research has found microplastics in human brains, hearts, reproductive organs, and lungs. Scientists now say that as plastic fragments, its surface area increases, generating reactive oxygen species that likely cause biological damage.
Plant-Based Coating Shows Promise
The new coating uses cellulose acetate, a bioplastic derived from plants, reinforced with cellulose nanocrystals for durability. Testing showed the coating did not degrade after prolonged exposure to boiling water, food oil, and various solvents. Dr. Shirley Tang, a chemistry professor who led the team, said learning how easily plastic liners shed particles was eye-opening.
Cost and Environmental Benefits
The coating also maintains protective properties when applied to lightweight paper such as brown paper towels, potentially reducing material use and manufacturing costs. Dr. Sayan Ganguly, a research associate in Tang's lab, noted savings could be passed to consumers. Unlike fossil fuel-based cups that persist for centuries, the bioplastic coating is biodegradable and could be adapted for other food packaging.
