| Title: | Exploring chitosan-plant extract bilayer coatings: Advancements in active food packaging via polypropylene modification |
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| Authors: | ID Kaloper, Saša (Author)
ID Plohl, Olivija (Author)
ID Smole Možina, Sonja (Author)
ID Vesel, Alenka (Author)
ID Šimat, Vida (Author)
ID Fras Zemljič, Lidija (Author) |
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| Files: |  1-s2.0-S0141813024031131-main.pdf (4,75 MB)
MD5: 20770876C9A361F25CF3A4BA38F45E7E
 https://www.sciencedirect.com/science/article/pii/S0141813024031131?via%3Dihub
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| Language: | English |
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| Work type: | Article |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | FS - Faculty of Mechanical Engineering
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| Abstract: | UV-ozone activated polypropylene (PP) food films were subjected to a novel bilayer coating process involving primary or quaternary chitosan (CH/QCH) as the first layer and natural extracts from juniper needles (Juniperus oxycedrus; JUN) or blackberry leaves (Rubus fruticosus; BBL) as the second layer. This innovative approach aims to redefine active packaging (AP) development. Through a detailed analysis by surface characterization and bioactivity assessments (i.e., antioxidant and antimicrobial functionalities), we evaluated different coating combinations. Furthermore, we investigated the stability and barrier characteristics inherent in these coatings. The confirmed deposition, coupled with a comprehensive characterization of their composition and morphology, underscored the efficacy of the coatings. Our investigation included wettability assessment via contact angle (CA) measurements, X-ray photoelectron spectroscopy (XPS), and attenuated total reflectance Fourier-transform infrared spectroscopy (ATR-FTIR), which revealed substantial enhancements in surface concentrations of elements and functional groups of CH, QCH, JUN, and BBL. Scanning electron microscopy (SEM) unveiled the coatings' heterogeneity, while time-of-flight secondary ion mass spectrometry (ToF-SIMS) and CA profiling showed moderately compact bilayers on PP, providing active species on the hydrophilic surface, respectively. The coatings significantly reduced the oxygen permeability. Additionally, single-layer depositions of CH and QCH remained below the overall migration limit (OML). Remarkably, the coatings exhibited robust antioxidative properties due to plant extracts and exceptional antimicrobial activity against S. aureus, attributed to QCH. These findings underscore the pivotal role of film surface properties in governing bioactive characteristics and offer a promising pathway for enhancing food packaging functionality. |
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| Keywords: | chitosan, plant extracts, polypropylene, active packaging, surface characterization, bioactivity |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Submitted for review: | 05.02.2024 |
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| Article acceptance date: | 10.05.2024 |
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| Publication date: | 11.05.2024 |
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| Publisher: | Elsevier |
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| Year of publishing: | 2024 |
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| Number of pages: | 14 str. |
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| Numbering: | Vol. 270, part 2, [article no.] 132308 |
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| PID: | 20.500.12556/DKUM-88818  |
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| UDC: | 577:543.2/.9 |
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| ISSN on article: | 1879-0003 |
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| COBISS.SI-ID: | 196837891 |
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| DOI: | 10.1016/j.ijbiomac.2024.132308 |
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| Copyright: | © 2024 The Authors |
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| Publication date in DKUM: | 27.05.2024 |
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| Views: | 387 |
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| Downloads: | 93 |
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| Metadata: |    |
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| Categories: | Misc.
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