A Very Hungry Caterpillar Eats Plastic Bags, Researchers Say


In an interview Wednesday, Mr. Howe explained that it was important to determine whether the worms — which are the larval form of the greater wax moth and are commercially bred to be used by fishermen — were actually breaking chemical bonds in the plastic, and not just chewing the material down into smaller pieces.

To answer the question, the researchers employed what Mr. Howe delicately referred to as a “homogenated worm.” The scientists ground the larvae in a blender and spread the resulting paste on the plastic. That showed that it was some chemical or combination of chemicals within the insects that was causing the plastic to degrade.

“We think that it’s some enzyme that’s involved,” Mr. Howe said. “We don’t know if it’s actually produced by the worms or actually is produced by bacteria in the gut of the worms.”

That mystery enzyme or enzymes is breaking the long chain of carbon atoms at the center of the plastic into smaller containing molecules, Mr. Howe said. And while the researchers are not yet sure what those smaller molecules are, it is likely that they will be easier to recycle and reuse than the plastic from which they came.

Next, the scientists will begin to isolate individual elements within extracts from the worms, in an attempt to narrow down the chemical breaking the plastic’s bonds. If they are able to isolate that enzyme, then it might be possible to obtain the gene governing it and to insert that gene into a bacteria, which could be easier than cultivating the worms. Eventually, that bacteria could be used as the basis of a biotechnology process, Mr. Howe said.

He cautioned, however, that it would be at least several years before the initial discovery could lead to such a result.

“It’s certainly not going to be the case that within six months we’ve solved the world’s plastic problem,” he said. “I certainly wouldn’t want your readers to think that within a few months, they can start throwing away plastic bags without worrying about it.”

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