Journal
REACTIVE & FUNCTIONAL POLYMERS
Volume 73, Issue 10, Pages 1335-1339Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.reactfunctpolym.2013.03.020
Keywords
Enzyme; Polyester coating; Hydrolysis
Funding
- Federal Ministry of Economy, Family and Youth (BMWFJ)
- Federal Ministry of Traffic, Innovation and Technology (bmvit)
- Styrian Business Promotion Agency SFG
- Standortagentur Tirol and ZIT - Technology Agency of the City of Vienna through the COMET-Funding Program
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The potential of two hydrolytic enzymes, namely a lipase from Thermomyces lanuginosus (TIL) and a cutinase from Humicola insolens (HiC) for hydrolysis of the phthalic acid backbone based polyester coatings was assessed. Two phthalic acid/trimethylolpropane based model substrates resembling the structure of the polyester backbone of coatings were synthesized. Out of both enzymes, only the cutinase was able to hydrolyze both model substrates while the larger substrate was hydrolyzed at a lower rate. The cutinase was also able to hydrolyze a coating (alkyd resin) both in suspension and as dried film. LC-MS analysis of the hydrolysis products released from the coating revealed the presence of oleic acid, its monoglyceride, phthalic acid and 24(34(2-((2,3-dihydroxypropoxy)carbonyl)benzoyl)oxy)-2-hydroxypropoxy)carbonyl)benzoic acid. These results indicate that the enzyme was able to hydrolyze the polyester backbone as well as to release fatty acid side chains. Consequently, enzymatic hydrolysis has a potential for the removal of coatings, their recycling or their functionalization. (C) 2013 Elsevier Ltd. All rights reserved.
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