Upcycling Biodegradable PVA/Starch Film to a Bacterial Biopigment and Biopolymer

Meeting the challenge of circularity for plastics requires amenability to repurposing post-use, as equivalent or upcycled products. In a compelling advancement, complete circularity for a biodegradable polyvinyl alcohol/thermoplastic starch (PVA/TPS) food packaging film was demonstrated by bioconver...

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Autores principales:	Brana Pantelic, Marijana Ponjavic, Vukasin Jankovic, Ivana Aleksic, Sanja Stevanovic, James Murray, Margaret Brennan Fournet, Jasmina Nikodinovic-Runic
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	biopolymers thermoplastic starch mechanical properties PVA biodegradation upcycling Organic chemistry QD241-441
Acceso en línea:	https://doaj.org/article/d1619a03c1ef473c84b1009bf2e8b428
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spelling	oai:doaj.org-article:d1619a03c1ef473c84b1009bf2e8b4282021-11-11T18:44:05ZUpcycling Biodegradable PVA/Starch Film to a Bacterial Biopigment and Biopolymer10.3390/polym132136922073-4360https://doaj.org/article/d1619a03c1ef473c84b1009bf2e8b4282021-10-01T00:00:00Zhttps://www.mdpi.com/2073-4360/13/21/3692https://doaj.org/toc/2073-4360Meeting the challenge of circularity for plastics requires amenability to repurposing post-use, as equivalent or upcycled products. In a compelling advancement, complete circularity for a biodegradable polyvinyl alcohol/thermoplastic starch (PVA/TPS) food packaging film was demonstrated by bioconversion to high-market-value biopigments and polyhydroxybutyrate (PHB) polyesters. The PVA/TPS film mechanical properties (tensile strength (<i>σ</i><sub>u</sub>), 22.2 ± 4.3 MPa; strain at break (<i>ε</i><sub>u</sub>), 325 ± 73%; and Young’s modulus (<i>E</i>), 53–250 MPa) compared closely with low-density polyethylene (LDPE) grades used for food packaging. Strong solubility of the PVA/TPS film in water was a pertinent feature, facilitating suitability as a carbon source for bioprocessing and microbial degradation. Biodegradability of the film with greater than 50% weight loss occurred within 30 days of incubation at 37 °C in a model compost. Up to 22% of the PVA/TPS film substrate conversion to biomass was achieved using three bacterial strains, <i>Ralstonia eutropha</i> H16 (<i>Cupriavidus necator</i> ATCC 17699), <i>Streptomyces</i> sp. JS520, and <i>Bacillus subtilis</i> ATCC6633. For the first time, production of the valuable biopigment (undecylprodigiosin) by <i>Streptomyces</i> sp. JS520 of 5.3 mg/mL and the production of PHB biopolymer at 7.8% of cell dry weight by <i>Ralstonia eutropha</i> H16 from this substrate were reported. This low-energy, low-carbon post-use PVA/TPS film upcycling model approach to plastic circularity demonstrates marked progress in the quest for sustainable and circular plastic solutions.Brana PantelicMarijana PonjavicVukasin JankovicIvana AleksicSanja StevanovicJames MurrayMargaret Brennan FournetJasmina Nikodinovic-RunicMDPI AGarticlebiopolymersthermoplastic starchmechanical propertiesPVAbiodegradationupcyclingOrganic chemistryQD241-441ENPolymers, Vol 13, Iss 3692, p 3692 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	biopolymers thermoplastic starch mechanical properties PVA biodegradation upcycling Organic chemistry QD241-441
spellingShingle	biopolymers thermoplastic starch mechanical properties PVA biodegradation upcycling Organic chemistry QD241-441 Brana Pantelic Marijana Ponjavic Vukasin Jankovic Ivana Aleksic Sanja Stevanovic James Murray Margaret Brennan Fournet Jasmina Nikodinovic-Runic Upcycling Biodegradable PVA/Starch Film to a Bacterial Biopigment and Biopolymer
description	Meeting the challenge of circularity for plastics requires amenability to repurposing post-use, as equivalent or upcycled products. In a compelling advancement, complete circularity for a biodegradable polyvinyl alcohol/thermoplastic starch (PVA/TPS) food packaging film was demonstrated by bioconversion to high-market-value biopigments and polyhydroxybutyrate (PHB) polyesters. The PVA/TPS film mechanical properties (tensile strength (<i>σ</i><sub>u</sub>), 22.2 ± 4.3 MPa; strain at break (<i>ε</i><sub>u</sub>), 325 ± 73%; and Young’s modulus (<i>E</i>), 53–250 MPa) compared closely with low-density polyethylene (LDPE) grades used for food packaging. Strong solubility of the PVA/TPS film in water was a pertinent feature, facilitating suitability as a carbon source for bioprocessing and microbial degradation. Biodegradability of the film with greater than 50% weight loss occurred within 30 days of incubation at 37 °C in a model compost. Up to 22% of the PVA/TPS film substrate conversion to biomass was achieved using three bacterial strains, <i>Ralstonia eutropha</i> H16 (<i>Cupriavidus necator</i> ATCC 17699), <i>Streptomyces</i> sp. JS520, and <i>Bacillus subtilis</i> ATCC6633. For the first time, production of the valuable biopigment (undecylprodigiosin) by <i>Streptomyces</i> sp. JS520 of 5.3 mg/mL and the production of PHB biopolymer at 7.8% of cell dry weight by <i>Ralstonia eutropha</i> H16 from this substrate were reported. This low-energy, low-carbon post-use PVA/TPS film upcycling model approach to plastic circularity demonstrates marked progress in the quest for sustainable and circular plastic solutions.
format	article
author	Brana Pantelic Marijana Ponjavic Vukasin Jankovic Ivana Aleksic Sanja Stevanovic James Murray Margaret Brennan Fournet Jasmina Nikodinovic-Runic
author_facet	Brana Pantelic Marijana Ponjavic Vukasin Jankovic Ivana Aleksic Sanja Stevanovic James Murray Margaret Brennan Fournet Jasmina Nikodinovic-Runic
author_sort	Brana Pantelic
title	Upcycling Biodegradable PVA/Starch Film to a Bacterial Biopigment and Biopolymer
title_short	Upcycling Biodegradable PVA/Starch Film to a Bacterial Biopigment and Biopolymer
title_full	Upcycling Biodegradable PVA/Starch Film to a Bacterial Biopigment and Biopolymer
title_fullStr	Upcycling Biodegradable PVA/Starch Film to a Bacterial Biopigment and Biopolymer
title_full_unstemmed	Upcycling Biodegradable PVA/Starch Film to a Bacterial Biopigment and Biopolymer
title_sort	upcycling biodegradable pva/starch film to a bacterial biopigment and biopolymer
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/d1619a03c1ef473c84b1009bf2e8b428
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Upcycling Biodegradable PVA/Starch Film to a Bacterial Biopigment and Biopolymer

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