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Biosourced Disposable Trays Made of Brewer’s Spent Grain and Potato Starch

Single-use plastic items made of non-biodegradable and fossil-based materials have been identified as a major environmental problem in modern society. Food packaging materials represent an important fraction of these, and replacement with biosourced, sustainable and low-cost alternatives, is a key p...

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Autores principales: Ferreira, Ana M., Martins, Jorge, Carvalho, Luísa H., Magalhães, Fernão D.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6572608/
https://www.ncbi.nlm.nih.gov/pubmed/31130700
http://dx.doi.org/10.3390/polym11050923
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author Ferreira, Ana M.
Martins, Jorge
Carvalho, Luísa H.
Magalhães, Fernão D.
author_facet Ferreira, Ana M.
Martins, Jorge
Carvalho, Luísa H.
Magalhães, Fernão D.
author_sort Ferreira, Ana M.
collection PubMed
description Single-use plastic items made of non-biodegradable and fossil-based materials have been identified as a major environmental problem in modern society. Food packaging materials represent an important fraction of these, and replacement with biosourced, sustainable and low-cost alternatives, is a key priority. In the present work, and for the first time, trays suitable for some food packaging applications were produced by the hot-pressing of brewer’s spent grains (BSG, a low added-value byproduct of the beer industry), bound with potato starch. Expanded polystyrene (EPS) trays were used as reference, since this material has been widely used in food packaging trays. The results demonstrated that all trays produced with varying proportions of BSG and potato starch have appropriate flexural strength, with values ranging between 1.51 ± 0.32 MPa, for 80% BSG content, and 2.62 ± 0.46 MPa, for 40% BSG content, which is higher than for EPS, 0.64 ± 0.50 MPa. Regardless of BSG content, flexural strength and modulus decreased significantly after contact with water, due to starch plasticization, attaining values below EPS. Trays produced with 60% BSG, and also with the addition of chitosan and glyoxal presented the highest flexural strength, both before and after contact with water, 3.75 ± 0.52 MPa and 0.44 ± 0.11 MPa, respectively. The latter is reasonably close to the reference value obtained for EPS.
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spelling pubmed-65726082019-06-18 Biosourced Disposable Trays Made of Brewer’s Spent Grain and Potato Starch Ferreira, Ana M. Martins, Jorge Carvalho, Luísa H. Magalhães, Fernão D. Polymers (Basel) Article Single-use plastic items made of non-biodegradable and fossil-based materials have been identified as a major environmental problem in modern society. Food packaging materials represent an important fraction of these, and replacement with biosourced, sustainable and low-cost alternatives, is a key priority. In the present work, and for the first time, trays suitable for some food packaging applications were produced by the hot-pressing of brewer’s spent grains (BSG, a low added-value byproduct of the beer industry), bound with potato starch. Expanded polystyrene (EPS) trays were used as reference, since this material has been widely used in food packaging trays. The results demonstrated that all trays produced with varying proportions of BSG and potato starch have appropriate flexural strength, with values ranging between 1.51 ± 0.32 MPa, for 80% BSG content, and 2.62 ± 0.46 MPa, for 40% BSG content, which is higher than for EPS, 0.64 ± 0.50 MPa. Regardless of BSG content, flexural strength and modulus decreased significantly after contact with water, due to starch plasticization, attaining values below EPS. Trays produced with 60% BSG, and also with the addition of chitosan and glyoxal presented the highest flexural strength, both before and after contact with water, 3.75 ± 0.52 MPa and 0.44 ± 0.11 MPa, respectively. The latter is reasonably close to the reference value obtained for EPS. MDPI 2019-05-26 /pmc/articles/PMC6572608/ /pubmed/31130700 http://dx.doi.org/10.3390/polym11050923 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Ferreira, Ana M.
Martins, Jorge
Carvalho, Luísa H.
Magalhães, Fernão D.
Biosourced Disposable Trays Made of Brewer’s Spent Grain and Potato Starch
title Biosourced Disposable Trays Made of Brewer’s Spent Grain and Potato Starch
title_full Biosourced Disposable Trays Made of Brewer’s Spent Grain and Potato Starch
title_fullStr Biosourced Disposable Trays Made of Brewer’s Spent Grain and Potato Starch
title_full_unstemmed Biosourced Disposable Trays Made of Brewer’s Spent Grain and Potato Starch
title_short Biosourced Disposable Trays Made of Brewer’s Spent Grain and Potato Starch
title_sort biosourced disposable trays made of brewer’s spent grain and potato starch
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6572608/
https://www.ncbi.nlm.nih.gov/pubmed/31130700
http://dx.doi.org/10.3390/polym11050923
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