Biodegradation of Microplastic Derived from Poly(ethylene terephthalate) with Bacterial Whole-Cell Biocatalysts

At present, the pollution of microplastic directly threatens ecology, food safety and even human health. Polyethylene terephthalate (PET) is one of the most common of microplastics. In this study, the micro-size PET particles were employed as analog of microplastic. The engineered strain, which can growth with PET as sole carbon source, was used as biocatalyst for biodegradation of PET particles. A combinatorial processing based on whole-cell biocatalysts was constructed for biodegradation of PET. Compared with enzymes, the products can be used by strain growth and do not accumulated in culture solution. Thus, feedback inhibition of products can be avoided. When PET was treated with the alkaline strain under high pH conditions, the product concentration was higher and the size of PET particles decreased dramatically than that of the biocatalyst under neutral conditions. This shows that the method of combined processing of alkali and organisms is more efficient for biodegradation of PET. The novel approach of combinatorial processing of PET based on whole-cell biocatalysis provides an attractive avenue for the biodegradation of micplastics.

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Depolymerization and Assimilation of Poly (Ethylene Terephthalate) By Whole-Cell Bioprocess

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/394/2/022047 ◽

2018 ◽

Vol 394 ◽

pp. 022047

Author(s):

Jixian Gong ◽

Yuqiang Li ◽

Hongyang Wang ◽

Huiqin Li ◽

Jianfei Zhang

Keyword(s):

Ethylene Terephthalate ◽

Whole Cell ◽

Poly Ethylene Terephthalate ◽

Poly Ethylene

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Synthesis of a Bio-based and Biodegradable Poly(ethylene-co-isosorbide [2,2'-bithiophene]-5,5'-dicarboxylate) with enhanced Thermal and Degradability Properties

10.21203/rs.3.rs-851845/v1 ◽

2021 ◽

Author(s):

Dasilva Wandji ◽

Naomie Beolle Songwe Selabi

Keyword(s):

Ethylene Terephthalate ◽

Tensile Modulus ◽

Barrier Properties ◽

The Novel ◽

Melt Polycondensation ◽

Poly Ethylene Terephthalate ◽

Ligand Free ◽

Biodegradable Poly ◽

Palladium Catalyzed ◽

Poly Ethylene

Abstract In this investigation, a synthetic biopolymer prepared from bithiophene monomer, isosorbide and ethylene glycol, was synthesized through melt polycondensation. The result showed the polyesters to possess promising thermal and mechanical properties. The bithiophene monomer, [2,2'-bithiophene]-5,5'-dicarboxylicacid acid, was synthesized from a palladium-catalyzed, phosphine ligand-free direct coupling protocol, using polyethylene glycol palladium (Pd/PEG) as catalyst. The procedure was found effective at polymerizing the bithiophene monomer with isosorbide and glycol. The bithiophene polyester displayed several intriguing properties among good thermal resistance, crystallinity and high tensile modulus. Additionally, the bithiophene monomer coupled to isosorbide enhanced the polyester with a comparatively high glass transition temperature. Films cast out these polyesters display excellent oxygen and water barrier properties, and were interestingly superior to those of poly(ethylene terephthalate). Moreover, the novel polyester also has good soil degradability properties.

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