Scientists Unveil Enzyme That Converts Ocean Plastic Into Clean Fuel

When you think of plastic pollution, the image of endless floating debris often comes to mind. Now, imagine that same mess being turned into something useful – like fuel for a car. That’s exactly what a team of chemists and biologists at the Coastal Institute of Technology announced this week.

After years of trial‑and‑error, the group managed to tweak a naturally occurring enzyme, called PETase, so it could tackle the tougher, more ubiquitous plastics found in the ocean, such as polyethylene (PE) and polypropylene (PP). The result is a super‑enzyme they’ve nicknamed “PlastiClean”. In laboratory tests, PlastiClean reduced a kilogram of mixed marine plastic to a clear, oily liquid – essentially a crude hydrocarbon mixture – within eight hours.

"It’s not magic, it’s biology," laughed Dr. Lina Morales, lead author of the study. "We’ve just given the enzyme a better set of hands to grab and cut the polymer chains. The process is fast, and the by‑products are exactly the kind of hydrocarbons we can refine into diesel or jet fuel."

The team’s breakthrough rests on two key innovations. First, they used directed evolution – a method that mimics natural selection in a test tube – to repeatedly mutate the enzyme and pick out the versions that worked best on PE and PP. Second, they paired the enzyme with a mild chemical pretreatment that swells the plastic, making it easier for the enzyme to get a foothold.

Beyond the lab, the researchers are already looking at scale‑up possibilities. They envision floating treatment pods that could be anchored near high‑traffic dumping zones, where seawater and a small dose of the enzyme would do the heavy lifting. The pods would periodically pump out the resulting hydrocarbon slurry, which could then be shipped to refineries.

Of course, challenges remain. The enzyme’s activity drops off after several cycles, and the pretreatment chemicals, while relatively benign, still need to be optimized for large‑scale use. Yet the authors are optimistic. "We’re not claiming this solves the whole plastic crisis overnight," Dr. Morales cautioned, "but it offers a tangible, science‑based tool that turns waste into resource – something we desperately need."

The findings were published in the journal Nature Sustainability and have already sparked interest from several renewable‑energy startups. If the technology lives up to its promise, the future might just see a world where the phrase ‘plastic waste’ becomes a relic of the past.