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A Contribution to the Investigation of Enzyme-Catalysed Hydrolysis of Poly(ethylene terephthalate) Oligomers

✍ Scribed by Axel Nechwatal; Axel Blokesch; Monika Nicolai; Marcus Krieg; Axel Kolbe; Monika Wolf; Matthias Gerhardt

Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
322 KB
Volume
291
Category
Article
ISSN
1438-7492

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✦ Synopsis

Abstract

Summary: One strategy to solve the problem of unwanted PET oligomer deposits in textile production is their enzymatic cleavage. In this work a selection of different enzymes (esterases, lipases) were tested for this purpose. The capacity to hydrolyse PET oligomers of some of the tested enzymes has been previously described in the literature. In order to imitate practical conditions both dry and precipitated PET oligomers were used. The decrease in the amount of cyclic trimer, the main component of the PET oligomers, was monitored by HPLC. After treatment with the lipase from Triticum aestivum a decrease of 80 wt.‐% was found. However, the effect of this lipase seems to have less to do with catalysing hydrolytic cleavages of ester groups than with the absorption of the oligomer on the enzyme protein.

Cyclic PET trimer (cyclo‐tris[ethyleneglycolterephthalate]).

magnified imageCyclic PET trimer (cyclo‐tris[ethyleneglycolterephthalate]).

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A kinetic study of the depolymerisation
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✍ R. LΓ³pez-Fonseca; M. P. GonzΓ‘lez-Marcos; J. R. GonzΓ‘lez-Velasco; J. I. GutiΓ©rrez πŸ“‚ Article πŸ“… 2009 πŸ› Wiley (John Wiley & Sons) 🌐 English βš– 181 KB

## Abstract **BACKGROUND:** Chemical or tertiary recycling of waste polymers including PET, poly(ethylene terephthalate), leads to the formation of raw starting monomers by different depolymerisation routes. This work was focused on the identification of the catalytic behaviour, if any, of a series