HomeIndustry InsightsScientists Turn PET Bottles into Programmable Microbial Assembly Line for Plastic Upcycling

Scientists Turn PET Bottles into Programmable Microbial Assembly Line for Plastic Upcycling

2026-03-06

Researchers at the University of Illinois Urbana-Champaign have developed a groundbreaking method to transform plastic waste into a versatile resource using engineered microbes. The study, published in Nature Sustainability, presents a microbial assembly line that converts polyethylene terephthalate (PET) —commonly used in water and soda bottles—into a variety of valuable products on demand.

A New Approach to Plastic Waste

Each year, the world generates over 400 million tons of plastic waste, yet only about 9% is recycled. Most existing recycling methods are limited to producing a single, fixed product, regardless of changing needs. This new approach offers a flexible alternative by treating plastic waste as an adaptable resource.

How It Works

The research team, led by bioengineering professor Ting Lu and senior research scientist Yuanchao Qian, engineered the bacterium Pseudomonas putida to break down PET into pyruvate —a molecule essential for cellular energy and growth in most organisms.

In parallel, they developed a series of specialized microbes, each designed to consume pyruvate and produce a unique end-product. This modular system allows for the creation of virtually unlimited products by simply swapping the final microbe in the chain.

Proof of Concept

In a real-world demonstration, the team collected plastic bottles from their own recycling bins, shredded and hydrolyzed them, and fed the resulting material to their engineered P. putida. In the same container, they grew a strain of E. coli engineered to produce indigoidine, a natural blue dye. The E. coli successfully converted the pyruvate into the desired pigment.

Endless Possibilities

The flexibility of this system opens the door to producing a wide range of outputs, including:

- Biopolymers and enzymes for medical applications

- Chemicals and fuels for industrial use

- Electricity for powering electronic devices

"Plastic pollution is a global challenge, yet most recycling or upcycling approaches today are narrow—they convert plastic into a single, fixed product, regardless of changing or diverse needs," said Lu. "Our study takes a fundamentally different approach. We show that plastic waste can be treated as a versatile resource, capable of being converted into many different valuable products on demand."

Future Implications

The researchers believe this concept could transform plastic pollution from an environmental burden into a viable resource, addressing both sustainability and public health concerns.

Reference

Qian, Y. et al. (2026). A programmable microbial assembly line for plastic upcycling. Nature Sustainability. DOI: 10.1038/s41893-025-01765-9

Source: Adapted from materials provided by the University of Illinois at Urbana-Champaign