Breaking plastic down first helps enzymes finish the job
Todorović O, Golubović L, Katnić Đ, Milenković M, Gupta RK
Biodegradation
The foam cushions, spray insulation, and synthetic mulch covers many gardeners use are made from polyurethane, a plastic that barely breaks down on its own and currently has no good recycling path once it ends up in landfills or garden waste.
Polyurethane is a tough plastic used in everything from couch cushions to car parts, and it barely breaks down in nature. Scientists have been trying to use enzymes, nature's molecular scissors, to chew it apart for recycling, but the plastic's tangled structure blocks them. This review found that giving the plastic a head start, through heat, chemicals, or other pretreatments, makes it far easier for enzymes to finish the breakdown afterward.
Key Findings
Most known polyurethane-degrading enzymes only work well on polyester-based polyurethanes, leaving polyether-based types largely resistant to enzymatic breakdown
Pretreatments that alter crystallinity and cross-linking significantly improve enzyme accessibility to polyurethane surfaces
Combining chemical depolymerization with enzymatic hydrolysis currently stands out as the most effective recycling strategy identified
chevron_right Technical Summary
Scientists reviewed ways to pre-treat plastic polyurethanes, like heating them or breaking them down chemically first, so that enzymes can more easily digest and recycle them afterward.
Abstract Preview
Original paper
Pretreatment technologies to enhance enzymatic biodegradation of polyurethanes.
Polyurethanes represent one of the most widely produced synthetic polymers, with applications in construction, automotive, consumer goods, and biomedical sectors. Their extensive use, combined with...
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