期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 -, 期 -, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202216220
关键词
Aromatic Diamine; Glycolysis; Polyether Polyol; Polyurethane; Urethanase
Enzymatic degradation and recycling are effective ways to reduce the environmental impact of plastics. However, there has been no efficient enzyme reported for the hydrolysis of polyurethanes. In this study, researchers discovered urethanases from a metagenome library constructed from soil exposed to polyurethane waste. They then developed a chemoenzymatic process using urethanase for polyurethane foam recycling.
Enzymatic degradation and recycling can reduce the environmental impact of plastics. Despite decades of research, no enzymes for the efficient hydrolysis of polyurethanes have been reported. Whereas the hydrolysis of the ester bonds in polyester-polyurethanes by cutinases is known, the urethane bonds in polyether-polyurethanes have remained inaccessible to biocatalytic hydrolysis. Here we report the discovery of urethanases from a metagenome library constructed from soil that had been exposed to polyurethane waste for many years. We then demonstrate the use of a urethanase in a chemoenzymatic process for polyurethane foam recycling. The urethanase hydrolyses low molecular weight dicarbamates resulting from chemical glycolysis of polyether-polyurethane foam, making this strategy broadly applicable to diverse polyether-polyurethane wastes.
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