Poster Open Access

Enzymatic degradation of a commercial bio-based polyester and evaluation of the mechanism involved

Romano Angela; Rosato Antonella; Totaro Grazia; Celli Annamaria; Zanaroli Giulio; Sisti Laura


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    <subfield code="d">30 November - 03 December 2020</subfield>
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    <subfield code="a">15th European Bioplastics Conference</subfield>
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    <subfield code="u">University of Bologna</subfield>
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    <subfield code="a">Sisti Laura</subfield>
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    <subfield code="a">Romano Angela</subfield>
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    <subfield code="a">Enzymatic degradation of a commercial bio-based polyester and evaluation of the mechanism involved</subfield>
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    <subfield code="a">in-built Triggered Enzymes to Recycle Multi-layers: an INnovation for USes in plastic-packaging</subfield>
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    <subfield code="a">&lt;p&gt;Aliphatic polyesters are the most promising biodegradable plastics because of their high susceptibility to the attack of hydrolytic&lt;br&gt;
enzymes and of many microorganisms naturally occurring in the environment. Poly(butylene succinate-&lt;em&gt;co&lt;/em&gt;-adipate) (PBSA) is a biobased semicrystalline copolymer of poly(butylene succinate) (PBS), with adipic acid as co-monomer. It is highly biodegradable&lt;br&gt;
because of its lower crystallinity and higher flexibility of polymer chains compared to PBS. In the present study, the&amp;nbsp;biodegradability mechanism of PBSA was evaluated using cutinase from &lt;em&gt;Humicola insolens&lt;/em&gt;, which is a commercial hydrolytic enzyme presenting both lipase and esterase features. The polyester&amp;nbsp;degradation is based on weight loss measurements&amp;nbsp;combined to other analyses (i.e., GPC, &lt;sup&gt;1&lt;/sup&gt;H NMR, and DSC) performed on the residual solids of PBSA&amp;nbsp;films, in order to understand the molecular and chemical modifications induced at the surface and/or in the bulk of polymer materials over time. The results showed that the enzymatic degradation mechanism of cutinase proceed&amp;nbsp;by degrading the polymer from the surface of the film. An exo-type cleaving action mode was proposed based on the identification of the oligomers and monomers released as degradation products.&lt;/p&gt;</subfield>
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