A new super-enzyme that degrades plastic bottles six times faster than before has been developed by scientists and could be used for recycling within a year or two.
The super-enzyme, made from bacteria that naturally evolved the ability to eat plastic, enables the full recycling of the bottles. Scientists believe combining it with enzymes that break down cotton could also allow mixed-fabric clothing to be recycled. Millions of tonnes of such clothing is either dumped in landfill or incinerated. Plastic pollution has contaminated the whole planet, from the Arctic to the deepest oceans, and people are now known to consume and breathe microplastic particles. It is currently very difficult to break down plastic bottles into their chemical constituents in order to make new ones from old, meaning more new plastic is being created from oil each year.
The super-enzyme was engineered by linking two separate enzymes, both of which were found in the plastic-eating bug discovered at a Japanese waste site in 2016. The researchers revealed an engineered version of the first enzyme in 2018, which started breaking down the plastic in a few days. But the super-enzyme gets to work six times faster. Researchers have also been successful in finding bugs that eat other plastics such as polyurethane, which is widely used but rarely recycled. When polyurethane breaks down it can release toxic chemicals that would kill most bacteria, but the bug identified actually uses the material as food to power the process.
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