期刊
PROCESS BIOCHEMISTRY
卷 59, 期 -, 页码 58-64出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.procbio.2017.01.004
关键词
Enzymatic polymer recycling; Cutinase; Poly (ethylene terephthalate); Thermobifida cellulosilytica; Polymer blends
资金
- CARBIOS company (Saint-Beauzire, France)
- Federal Ministry of Science, Research and Economy (BMWFW)
- Federal Ministry of Traffic, Innovation and Technology (bmvit)
- Styrian Business Promotion Agency SFG
- Standortagentur Tirol
- ZIT - Technology Agency of the City of Vienna through the COMET-Funding Program
In this study we investigated the ability of a cutinase from Thermobifida cellulosilytica (Thc_Cut1) to hydrolyze poly (ethylene terephthalate) (PET) moieties in different polymer blends. The composition of various materials including commercial available bottles and packaging was determined using Fourier Transform InfraRed spectroscopy (FT-IR) and Differential Scanning Calorimetry (DSC). When incubated with PET blended with polyethylene (PE) or polyamide (PA) from packaging and bottles without prior separation, Thc_Cut1 selectively hydrolyzed the PET moieties releasing terephthalic acid (TPA) and mono(2-hydroxyethyl) terephthalate (MHET). Polymer blends were hydrolyzed in an up to 9 times higher extent compared to higher crystalline pure PET. The influence of various parameters like temperature, particle size, crystallinity and product inhibition on hydrolysis of PET moieties by Thc_Cut1 was investigated. The amount of products released was up to 10 times higher when the incubation temperature was increased from 40 degrees C to 60 degrees C. The smaller the particle size the higher the hydrolysis rates were. Interestingly, semi-crystalline (24%) PET from bottles was hydrolyzed faster than powder from amorphous PET films (12%). An inhibitory effect of bis(2-hydroxyethyl) terephthalate (BHET) on hydrolysis of PET by Thc_Cutl was observed. (C) 2017 Elsevier Ltd. All rights reserved.
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