Cast Extruded Films Based on Polyhydroxyalkanoate/Poly(lactic acid) Blend with Herbal Extracts Hybridized with Zinc Oxide

The aim of the presented work was to functionalize a blend based on polyhydroxyalkanoate (PHA): poly(hydroxybutyrate (PHB) with poly(lactic acid) (PLA) and a mixture of three selected herb extracts, namely, L., L. and L., (E), zinc oxide (ZnO) and a combined system (EZnO), produced via extrusion. Be...

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Bibliographic Details
Published in:Polymers 2024-07, Vol.16 (14), p.1954
Main Authors: Zdanowicz, Magdalena, Mizielińska, Małgorzata, Kowalczyk, Agnieszka
Format: Article
Language:English
Subjects:
Additives
Antimicrobial agents
E coli
Ethanol
Flavonoids
Food
Food packaging
Herbs
Microorganisms
Mixtures
Nanoparticles
Optical properties
Plastics
Polyhydroxyalkanoates
Polylactic acid
Polymers
Synergistic effect
Thermal analysis
Thermal stability
Zinc oxide
Zinc oxides
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Summary:The aim of the presented work was to functionalize a blend based on polyhydroxyalkanoate (PHA): poly(hydroxybutyrate (PHB) with poly(lactic acid) (PLA) and a mixture of three selected herb extracts, namely, L., L. and L., (E), zinc oxide (ZnO) and a combined system (EZnO), produced via extrusion. Before processing with bioresin, the natural modifiers were characterized using thermal analysis, FTIR and antimicrobial tests. The results revealed interactions between the extracts and the filler, leading to higher thermal stability in EZnO than when using E alone. Moreover, the mixture of extracts exhibited antimicrobial properties toward both Gram-negative ( ) as well as Gram-positive bacteria ( ). Modified regranulates were transformed into films by cast extrusion. The influence of the additives on thermal (DSC, TGA and OIT), mechanical, barrier (WVTR and OTR), morphological (FTIR) and optical properties was investigated. The EZnO additive had the highest impact on the mechanical, barrier (OTR and WVTR) and optical properties of the bioresin. The microbial test results revealed that PHA-EZnO exhibited higher activity than PHA-ZnO and PHA-E and also reduced the number of , and cells. The findings confirmed the synergistic effect between the additive components. Modified polyester films did not eliminate the phi6 bacteriophage particles completely, but they did decrease their number, confirming moderate antiviral effectiveness.
ISSN:2073-4360
2073-4360
DOI:10.3390/polym16141954