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New Poly(lactic acid) Active Packaging Composite Films Incorporated with Fungal Melanin

In this work, fungal melanin was used for the first time to prepare poly(lactic acid)-based composites. The films of various melanin concentrations (0.025%, 0.05% and 0.2% w/w) were prepared using an extrusion method. The mechanical, antioxidant, antimicrobial, water vapor and UV-Vis barrier propert...

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Autores principales: Łopusiewicz, Łukasz, Jędra, Filip, Mizielińska, Małgorzata
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6415272/
https://www.ncbi.nlm.nih.gov/pubmed/30966422
http://dx.doi.org/10.3390/polym10040386
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author Łopusiewicz, Łukasz
Jędra, Filip
Mizielińska, Małgorzata
author_facet Łopusiewicz, Łukasz
Jędra, Filip
Mizielińska, Małgorzata
author_sort Łopusiewicz, Łukasz
collection PubMed
description In this work, fungal melanin was used for the first time to prepare poly(lactic acid)-based composites. The films of various melanin concentrations (0.025%, 0.05% and 0.2% w/w) were prepared using an extrusion method. The mechanical, antioxidant, antimicrobial, water vapor and UV-Vis barrier properties, as well as available polyphenolics on the surface, were studied. FT-IR and Raman spectroscopy studies were carried out to analyze the chemical composition of the resulting films. The hydrophobicity, color response, thermal, optical properties, and opacity values were also determined. The results of this study show that the addition of fungal melanin to poly(lactic acid) (PLA) as a modifier influenced mechanical and water vapor barrier properties depending on melanin concentration. In low concentration, melanin enhanced the mechanical and barrier properties of the modified films, but in larger amounts, the properties were decreased. The UV-Vis barrier properties of PLA/melanin composites were marginally improved. Differential Scanning Calorimetry (DSC) analysis indicated that crystallinity of PLA increased by the addition of melanin, but this did not affect the thermal stability of the films. Modified PLA/melanin films showed good antioxidant activity and were active against Enterococcus faecalis, Pseudomonas aeruginosa and Pseudomonas putida. The addition of melanin caused changes in color values, decreasing lightness and increasing the redness and yellowness of films. Based on the results of this study, fungal melanin has good potential to be exploited as a value-added modifier that can improve the overall properties of PLA.
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spelling pubmed-64152722019-04-02 New Poly(lactic acid) Active Packaging Composite Films Incorporated with Fungal Melanin Łopusiewicz, Łukasz Jędra, Filip Mizielińska, Małgorzata Polymers (Basel) Article In this work, fungal melanin was used for the first time to prepare poly(lactic acid)-based composites. The films of various melanin concentrations (0.025%, 0.05% and 0.2% w/w) were prepared using an extrusion method. The mechanical, antioxidant, antimicrobial, water vapor and UV-Vis barrier properties, as well as available polyphenolics on the surface, were studied. FT-IR and Raman spectroscopy studies were carried out to analyze the chemical composition of the resulting films. The hydrophobicity, color response, thermal, optical properties, and opacity values were also determined. The results of this study show that the addition of fungal melanin to poly(lactic acid) (PLA) as a modifier influenced mechanical and water vapor barrier properties depending on melanin concentration. In low concentration, melanin enhanced the mechanical and barrier properties of the modified films, but in larger amounts, the properties were decreased. The UV-Vis barrier properties of PLA/melanin composites were marginally improved. Differential Scanning Calorimetry (DSC) analysis indicated that crystallinity of PLA increased by the addition of melanin, but this did not affect the thermal stability of the films. Modified PLA/melanin films showed good antioxidant activity and were active against Enterococcus faecalis, Pseudomonas aeruginosa and Pseudomonas putida. The addition of melanin caused changes in color values, decreasing lightness and increasing the redness and yellowness of films. Based on the results of this study, fungal melanin has good potential to be exploited as a value-added modifier that can improve the overall properties of PLA. MDPI 2018-04-01 /pmc/articles/PMC6415272/ /pubmed/30966422 http://dx.doi.org/10.3390/polym10040386 Text en © 2018 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
Łopusiewicz, Łukasz
Jędra, Filip
Mizielińska, Małgorzata
New Poly(lactic acid) Active Packaging Composite Films Incorporated with Fungal Melanin
title New Poly(lactic acid) Active Packaging Composite Films Incorporated with Fungal Melanin
title_full New Poly(lactic acid) Active Packaging Composite Films Incorporated with Fungal Melanin
title_fullStr New Poly(lactic acid) Active Packaging Composite Films Incorporated with Fungal Melanin
title_full_unstemmed New Poly(lactic acid) Active Packaging Composite Films Incorporated with Fungal Melanin
title_short New Poly(lactic acid) Active Packaging Composite Films Incorporated with Fungal Melanin
title_sort new poly(lactic acid) active packaging composite films incorporated with fungal melanin
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6415272/
https://www.ncbi.nlm.nih.gov/pubmed/30966422
http://dx.doi.org/10.3390/polym10040386
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