Enzymatic depolymerization of highly crystalline polyethylene terephthalate enabled in moist-solid reaction mixtures.
| Autor: | Kaabel S; Department of Chemistry, McGill University, Montréal, QC H3A 0B8, Canada., Therien JPD; Department of Chemistry, McGill University, Montréal, QC H3A 0B8, Canada., Deschênes CE; Department of Chemistry, McGill University, Montréal, QC H3A 0B8, Canada., Duncan D; Department of Chemistry, McGill University, Montréal, QC H3A 0B8, Canada., Friščić T; Department of Chemistry, McGill University, Montréal, QC H3A 0B8, Canada karine.auclair@mcgill.ca tomislav.friscic@mcgill.ca., Auclair K; Department of Chemistry, McGill University, Montréal, QC H3A 0B8, Canada karine.auclair@mcgill.ca tomislav.friscic@mcgill.ca. |
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| Jazyk: | angličtina |
| Zdroj: | Proceedings of the National Academy of Sciences of the United States of America [Proc Natl Acad Sci U S A] 2021 Jul 20; Vol. 118 (29). |
| DOI: | 10.1073/pnas.2026452118 |
| Abstrakt: | Less than 9% of the plastic produced is recycled after use, contributing to the global plastic pollution problem. While polyethylene terephthalate (PET) is one of the most common plastics, its thermomechanical recycling generates a material of lesser quality. Enzymes are highly selective, renewable catalysts active at mild temperatures; however, they lack activity toward the more crystalline forms of PET commonly found in consumer plastics, requiring the energy-expensive melt-amorphization step of PET before enzymatic depolymerization. We report here that, when used in moist-solid reaction mixtures instead of the typical dilute aqueous solutions or slurries, the cutinase from Humicola insolens can directly depolymerize amorphous and crystalline regions of PET equally, without any pretreatment, with a 13-fold higher space-time yield and a 15-fold higher enzyme efficiency than reported in prior studies with high-crystallinity material. Further, this process shows a 26-fold selectivity for terephthalic acid over other hydrolysis products. Competing Interests: The authors declare no competing interest. |
| Databáze: | MEDLINE |
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