Enzymatic hydrolysis of polyester based coatings |
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Authors: | Katrin Greimel Annemarie Marold Christian Sohar Roland Feola Armin Temel Thomas Schoenbacher Enrique Herrero Acero Georg M. Guebitz |
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Affiliation: | 1. ACIB GmbH, Petersgasse 14, A-8010 Graz, Austria;2. Cytec Austria GmbH, Lechgasse 21, A-8010 Graz, Austria;3. Institute of Environmental Biotechnology, Graz University of Technology, Petersgasse 12, A-8010 Graz, Austria |
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Abstract: | The potential of two hydrolytic enzymes, namely a lipase from Thermomyces lanuginosus (TlL) 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 2-((3-((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. |
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Keywords: | Enzyme Polyester coating Hydrolysis |
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