Low Carbon Footprint Recycling of Post‐Consumer PET Plastic with a Metagenomic Polyester Hydrolase

Earth is flooded with plastics and the need for sustainable recycling strategies for polymers has become increasingly urgent. Enzyme‐based hydrolysis of post‐consumer plastic is an emerging strategy for closed‐loop recycling of polyethylene terephthalate (PET). The polyester hydrolase PHL7, isolated...

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Vydáno v:ChemSusChem Ročník 15; číslo 9; s. e202101062 - n/a
Hlavní autoři: Sonnendecker, Christian, Oeser, Juliane, Richter, P. Konstantin, Hille, Patrick, Zhao, Ziyue, Fischer, Cornelius, Lippold, Holger, Blázquez‐Sánchez, Paula, Engelberger, Felipe, Ramírez‐Sarmiento, César A., Oeser, Thorsten, Lihanova, Yuliia, Frank, Ronny, Jahnke, Heinz‐Georg, Billig, Susan, Abel, Bernd, Sträter, Norbert, Matysik, Jörg, Zimmermann, Wolfgang
Médium: Journal Article
Jazyk:angličtina
Vydáno: Germany Wiley Subscription Services, Inc 06.05.2022
John Wiley and Sons Inc
Témata:
biocatalysis
Carbon
Carbon Footprint
Enzymes
Footprint analysis
hydrolases
Hydrolases - metabolism
Hydrolysates
Leucine
Metagenome
Plastics - chemistry
Polyesters
Polyethylene terephthalate
Polyethylene Terephthalates - chemistry
polymer degradation
Recycling
Structural analysis
Terephthalic acid
hydrolases
recycling
polymer degradation
metagenome
biocatalysis
ISSN:1864-5631, 1864-564X, 1864-564X
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Shrnutí:Earth is flooded with plastics and the need for sustainable recycling strategies for polymers has become increasingly urgent. Enzyme‐based hydrolysis of post‐consumer plastic is an emerging strategy for closed‐loop recycling of polyethylene terephthalate (PET). The polyester hydrolase PHL7, isolated from a compost metagenome, completely hydrolyzes amorphous PET films, releasing 91 mg of terephthalic acid per hour and mg of enzyme. Vertical scanning interferometry shows degradation rates of the PET film of 6.8 μm h−1. Structural analysis indicates the importance of leucine at position 210 for the extraordinarily high PET‐hydrolyzing activity of PHL7. Within 24 h, 0.6 mgenzyme gPET−1 completely degrades post‐consumer thermoform PET packaging in an aqueous buffer at 70 °C without any energy‐intensive pretreatments. Terephthalic acid recovered from the enzymatic hydrolysate is then used to synthesize virgin PET, demonstrating the potential of polyester hydrolases as catalysts in sustainable PET recycling processes with a low carbon footprint. Tread lightly: A highly efficient polyester hydrolase derived from plant compost metagenomes rapidly degrades amorphous polyethylene terephthalate (PET) at 70 °C. The direct hydrolysis of thermoform PET packaging flakes and the conversion of the recovered terephthalic acid into virgin PET demonstrate the potential of biocatalysis in plastic recycling processes with a low carbon footprint.
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ISSN:1864-5631
1864-564X
1864-564X
DOI:10.1002/cssc.202101062