Generally speaking, plastic is incredibly resistant to breaking down, and that's certainly true of the trillion polyethylene plastic bags that people use each and every year.
But researchers may now be on track to find a solution for plastic waste; and the key is a caterpillar commonly known as a wax worm.Federica Bertocchini and her colleagues at the Institute of Biomedicine and Biotechnology of Cantabria made the discovery quite by accident, after noticing that plastic bags containing wax worms quickly became riddled with holes. Further study showed that the worms can do damage to a plastic bag in less than an hour.
After 12 hours, all that munching of plastic leads to an obvious reduction in plastic mass. The researchers showed that the wax worms were not only ingesting the plastic, they were also chemically transforming the polyethylene into ethylene glycol.
Although wax worms wouldn't normally eat plastic, the researchers suspect that their ability is a byproduct of their natural habits. Wax moths lay their eggs inside beehives. The worms hatch and grow on beeswax, which is composed of a highly diverse mixture of lipid compounds. The researchers say the molecular details of wax biodegradation require further investigation, but it's likely that digesting beeswax and polyethylene involves breaking down similar types of chemical bonds.
"Wax is a polymer, a sort of ‘natural plastic,' and has a chemical structure not dissimilar to polyethylene," Bertocchini says. "We are planning to implement this finding into a viable way to get rid of plastic waste, working towards a solution to save our oceans, rivers, and all the environment from the unavoidable consequences of plastic accumulation.
"However," she adds, "we should not feel justified to dump polyethylene deliberately in our environment just because we now know how to bio-degrade it."
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