| Title | β-Ketoadipic acid production from poly(ethylene terephthalate) waste via chemobiological upcycling |
|---|---|
| ID_Doc | 10042 |
| Authors | You, SM; Lee, SS; Ryu, MH; Song, HM; Kang, MS; Jung, YJ; Song, EC; Sung, BH; Park, SJ; Joo, JC; Kim, HT; Cha, HG |
| Title | β-Ketoadipic acid production from poly(ethylene terephthalate) waste via chemobiological upcycling |
| Year | 2023 |
| Published | Rsc Advances, 13.0, 21 |
| Abstract | The upcycling of poly(ethylene terephthalate) (PET) waste can simultaneously produce value-added chemicals and reduce the growing environmental impact of plastic waste. In this study, we designed a chemobiological system to convert terephthalic acid (TPA), an aromatic monomer of PET, to beta-ketoadipic acid (beta KA), a C6 keto-diacid that functions as a building block for nylon-6,6 analogs. Using microwave-assisted hydrolysis in a neutral aqueous system, PET was converted to TPA with Amberlyst-15, a conventional catalyst with high conversion efficiency and reusability. The bioconversion process of TPA into beta KA used a recombinant Escherichia coli beta KA expressing two conversion modules for TPA degradation (tphAabc and tphB) and beta KA synthesis (aroY, catABC, and pcaD). To improve bioconversion, the formation of acetic acid, a deleterious factor for TPA conversion in flask cultivation, was efficiently regulated by deleting the poxB gene along with operating the bioreactor to supply oxygen. By applying two-stage fermentation consisting of the growth phase in pH 7 followed by the production phase in pH 5.5, a total of 13.61 mM beta KA was successfully produced with 96% conversion efficiency. This efficient chemobiological PET upcycling system provides a promising approach for the circular economy to acquire various chemicals from PET waste. |
| https://pubs.rsc.org/en/content/articlepdf/2023/ra/d3ra02072j |
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