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Article Abstract
Poly-(lactic acid) (PLA) is the most widely produced biopolymer globally, with 920,000 tons reaching the market in 2024. Although it is a biobased polymer and biodegradable, it currently poses a threat by generating a considerable waste stream in the environment unless its end-of-life options are further developed. Biorecycling of PLA is a promising solution and is critical for PLA to be a truly sustainable alternative to conventional plastics, further enabling the (bio)-plastics circular economy. This work investigates the repurposing of commercial Savinase 12T preparation, already produced on a large scale for the detergent industry, for the degradation of consumer-grade PLA. Savinase-degraded postconsumer PLA single-use cups at a rate of 166 mg·day·mg enzyme for the lid part (crystallinity ( ) 22.9%) and 40 mg·day·mg enzyme for the body part ( 42.0%). The average degradation rate of PLA 3D printer filaments was determined to be 56 mg·day·mg enzyme under optimized conditions of pH 8.5 and 42 °C. Lactic acid was identified as the main PLA degradation product of Savinase depolymerizing activity. Molecular modeling revealed Asn155 and Ser125 as key residues involved in PLA tetramer binding.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC12188634 | PMC |
| http://dx.doi.org/10.1021/acssuschemeng.5c03378 | DOI Listing |
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