Special Issue "Biodegradable Films and Composite Coatings: Current and Future Trends"

A special issue of Coatings (ISSN 2079-6412). This special issue belongs to the section "Coatings for Food Technology and System".

Deadline for manuscript submissions: 20 August 2022 | Viewed by 11504

Special Issue Editor

Dr. Isabel M. Coelhoso
E-Mail Website
Guest Editor
Associate Professor, Department of Chemistry, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
Interests: design of biopolymer membranes for biotechnology applications; biodegradable polymers and nanocomposites for food packaging
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The relevance of developing environmentally friendly and biodegradable materials for the preparation of films and coatings is attracting much attention. This ambitious challenge is crucial for a more sustainable approach in the production of packaging for food products.

Films and coatings with antimicrobial and antioxidant properties are needed in food applications, for increasing shelflife and enhancing the microbial safety of food products.

Nanocomposites, which include nanoparticles and nanolaminates to create multilayered systems, are being developed in order to improve mechanical and barrier properties. However, despite the advantages of this innovative technology, the possible toxicity effects due to nanoparticles migration to the packaged food need to be addressed.

This Special Issue aims to collect key contributions to the field, and to give an overview about the use of biodegradable films and coatings in food packaging applications.

Prof. Dr. Isabel Coelhoso
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Coatings is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2000 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Biodegradable films and coatings
  • Antimicrobial
  • Antioxidant
  • Nanocomposites
  • Nanolaminates
  • Shelflife
  • Packaging

Published Papers (7 papers)

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Research

Article
Strategies to Improve the Barrier and Mechanical Properties of Pectin Films for Food Packaging: Comparing Nanocomposites with Bilayers
Coatings 2022, 12(2), 108; https://doi.org/10.3390/coatings12020108 - 18 Jan 2022
Viewed by 579
Abstract
Traditional food packaging systems help reduce food wastage, but they also produce environmental impacts when not properly disposed of. Bio-based polymers are a promising solution to overcome these impacts, but they have poor barrier and mechanical properties. This work evaluates two strategies to [...] Read more.
Traditional food packaging systems help reduce food wastage, but they also produce environmental impacts when not properly disposed of. Bio-based polymers are a promising solution to overcome these impacts, but they have poor barrier and mechanical properties. This work evaluates two strategies to improve these properties in pectin films: the incorporation of cellulose nanocrystals (CNC) or sodium montmorillonite (MMT) nanoparticles, and an additional layer of chitosan (i.e., a bilayer film). The bionanocomposites and bilayer films were characterized in terms of optical, morphological, hygroscopic, mechanical and barrier properties. The inclusion of the nanofillers in the polymer reduced the water vapor permeability and the hydrophilicity of the films without compromising their visual properties (i.e., their transparency). However, the nanoparticles did not substantially improve the mechanical properties of the bionanocomposites. Regarding the bilayer films, FTIR and contact angle studies revealed no surface and/or chemical modifications, confirming only physical coating/lamination between the two polymers. These bilayer films exhibited a dense homogenous structure, with intermediate optical and hygroscopic properties. An additional layer of chitosan did not improve the mechanical, water vapor and oxygen barrier properties of the pectin films. However, this additional layer made the material more hydrophobic, which may play an important role in the application of pectin as a food packaging material. Full article
(This article belongs to the Special Issue Biodegradable Films and Composite Coatings: Current and Future Trends)
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Article
Biodegradable Chitosan Films with ZnO Nanoparticles Synthesized Using Food Industry By-Products—Production and Characterization
Coatings 2021, 11(6), 646; https://doi.org/10.3390/coatings11060646 - 27 May 2021
Cited by 3 | Viewed by 1485
Abstract
This work aimed to produce bionanocomposites of chitosan incorporated with zinc oxide nanoparticles (ZnO NPs) synthesized using food industry by-products and to characterize them. Such nanoparticles are highlighted due to their low cost, antimicrobial activity, accessibility, and sustainability synthesis. Four different levels of [...] Read more.
This work aimed to produce bionanocomposites of chitosan incorporated with zinc oxide nanoparticles (ZnO NPs) synthesized using food industry by-products and to characterize them. Such nanoparticles are highlighted due to their low cost, antimicrobial activity, accessibility, and sustainability synthesis. Four different levels of ZnO NPs (0, 0.5, 1.0, and 2.0% w/w of chitosan) were tested, and the bionanocomposites were characterized in terms of their hydrophobicity, mechanical, optical, and barrier properties. Overall, the incorporation of ZnO NPs changed the composites from brittle to ductile, with enhanced elongation at break and reduced Young Modulus and tensile strength. Thus, ZnO NPs acted as plasticizer, turning the films more flexible, due to the presence of organic compounds on the NPs. This also favored permeability of oxygen and of water vapor, but the good barrier properties were maintained. Optical properties did not change statistically with the ZnO NPs incorporation. Thus, the characterization presented in this paper may contribute to support a decision on the choice of the material’s final application. Full article
(This article belongs to the Special Issue Biodegradable Films and Composite Coatings: Current and Future Trends)
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Article
Films of Chitosan and Aloe vera for Maintaining the Viability and Antifungal Activity of Lactobacillus paracasei TEP6
Coatings 2020, 10(3), 259; https://doi.org/10.3390/coatings10030259 - 10 Mar 2020
Cited by 5 | Viewed by 1217
Abstract
The present study aimed to evaluate the effect of Aloe vera addition on the viability and antifungal activity of TEP6 (Lactobacillus paracasei) bacteria immobilized on chitosan films for 28 days. Different chitosan and A. vera proportions and carbon sources at several [...] Read more.
The present study aimed to evaluate the effect of Aloe vera addition on the viability and antifungal activity of TEP6 (Lactobacillus paracasei) bacteria immobilized on chitosan films for 28 days. Different chitosan and A. vera proportions and carbon sources at several pH values were tested as formulations for supporting the microorganism. Bacterial viability was maintained in freshly made films, with values of 10.4, 10.8 and 10.9 log CFU·g−1 for the formulations containing 70% (T11), 100% (T8) and 100% (T16) of A. vera, respectively. The same formulations (T8, T11 and T16) maintained bacterial viability for 14 days of film storage with a loss to values of 9.5 log CFU·g−1. By applying a quarter fraction 25–2 experimental design with an array of five factors, the factors with the greatest influence on viability and antifungal activity were determined. The optimal conditions for viability were the formulation with 100% A. vera, pH 4.5 and 0.1 M glucose. The antifungal activity of fresh films was influenced by the formulation with 10 g·L−1 glycerol and 100% A. vera, showing a 60% inhibition of fungal (Colletotrichum gloeosporioides) growth. The films developed in this study may have the potential to be used as coatings on vegetal products susceptible to attack by Colletotrichum gloesporioides. Full article
(This article belongs to the Special Issue Biodegradable Films and Composite Coatings: Current and Future Trends)
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Article
Production, Preparation and Characterization of Microalgae-Based Biopolymer as a Potential Bioactive Film
Coatings 2020, 10(2), 120; https://doi.org/10.3390/coatings10020120 - 31 Jan 2020
Cited by 11 | Viewed by 1747
Abstract
Six microalgae strains were screened according to their biomass productivity and polymer synthesis, showing biomass productivity between 0.14 and 0.68 g/(L·d) for a 21-day growth period. Extracellular biopolymers from the spent culture media of Nostoc sp. (No), Synechocystis sp. (Sy), and Porphyridium purpureum [...] Read more.
Six microalgae strains were screened according to their biomass productivity and polymer synthesis, showing biomass productivity between 0.14 and 0.68 g/(L·d) for a 21-day growth period. Extracellular biopolymers from the spent culture media of Nostoc sp. (No), Synechocystis sp. (Sy), and Porphyridium purpureum (Pp) was obtained, and the yields of the clean biopolymer were 323, 204, and 83 mg/L, respectively. The crude biopolymer was cleaned up using a solid-phase extraction technique. The emulsification index E24 values for the clean biopolymer were 77.5%, 68.8%, and 73.3% at 0.323, 0.083, and 0.204 mg/mL, respectively. The clean biopolymer of the No strain showed the highest fungal growth inhibition against Fusarium verticillioides (70.2%) and Fusarium sp. (61.4%) at 2.24 mg/mL. In general, transparent and flexible biofilms were prepared using biopolymers of No and Pp. The microstructural analysis revealed the presence of pores and cracks in the biofilms, and the average roughness Ra values are 68.6 and 86.4 nm for No and Pp, respectively, and the root mean square roughness Rq values are 86.2 and 107.2 nm for No and Pp, respectively. Full article
(This article belongs to the Special Issue Biodegradable Films and Composite Coatings: Current and Future Trends)
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Article
Eco-Friendly ZnO/Chitosan Bionanocomposites Films for Packaging of Fresh Poultry Meat
Coatings 2020, 10(2), 110; https://doi.org/10.3390/coatings10020110 - 28 Jan 2020
Cited by 24 | Viewed by 2372
Abstract
The advances on the development of novel materials capable to enhance the shelf life of food products may contribute to reduce the current worldwide food waste problem. Zinc oxide nanoparticles (ZnO NPs) are considered GRAS (Generally Recognized as Safe) by the Food and [...] Read more.
The advances on the development of novel materials capable to enhance the shelf life of food products may contribute to reduce the current worldwide food waste problem. Zinc oxide nanoparticles (ZnO NPs) are considered GRAS (Generally Recognized as Safe) by the Food and Drug Administration (FDA) and due to their good antimicrobial properties are suitable to be applied as active compounds in food packaging. ZnO NPs were synthesized to be tested in active bionanocomposites through an eco-friendlier route using apple peel wastes. This work aimed to develop bionanocomposites based on chitosan and incorporated with ZnO NPs to characterize its bioactivity via in vitro and in situ studies, using fresh poultry meat as the food matrix. Overall, bio-based biodegradable films presented good antimicrobial activity, being the intrinsic antimicrobial properties of chitosan enhanced by the ZnO NPs added on the system. When used as primary packaging of the meat, the samples protected with the films presented a decrease on the deterioration speed, which was represented by the preservation of the initial reddish color of the meat and reduction on the oxidation process and microbiological growth. The nanoparticles enhanced especially the antioxidant properties of the films and proved to be potential food preservatives agents to be used in active food packaging. Full article
(This article belongs to the Special Issue Biodegradable Films and Composite Coatings: Current and Future Trends)
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Article
Effect of Linseed (Linum usitatissimum) Mucilage and Chitosan Edible Coatings on Quality and Shelf-Life of Fresh-Cut Cantaloupe (Cucumis melo)
Coatings 2019, 9(6), 368; https://doi.org/10.3390/coatings9060368 - 05 Jun 2019
Cited by 8 | Viewed by 1762
Abstract
We have evaluated the effect of edible coatings (ECs) based on linseed mucilage (LM), chitosan (CH), and their combination (LMCH) on the quality and shelf life of fresh-cut cantaloupe. Cantaloupe was washed, sanitized, and processed (peeled, seeded, and cut) and then coated by [...] Read more.
We have evaluated the effect of edible coatings (ECs) based on linseed mucilage (LM), chitosan (CH), and their combination (LMCH) on the quality and shelf life of fresh-cut cantaloupe. Cantaloupe was washed, sanitized, and processed (peeled, seeded, and cut) and then coated by immersion, packed, and stored for 18 days at 4 °C. The ECs were effective at reducing the juice leakage and softening of the product. The EC based on CH was the most effective at preserving the color parameter and reducing the general microbiological growth. However, the LMCH combination decreased the antimicrobial effect of chitosan against microorganisms. Also, CH and LM ECs helped preserve the overall sensory characteristics, increasing the acceptance to 12–15 days. Finally, the LMCH combination helped preserve the characteristics of color and odor; however, it modified the texture and taste of fresh-cut cantaloupe and its sensory acceptance was similar to the control (up to 9 days). Full article
(This article belongs to the Special Issue Biodegradable Films and Composite Coatings: Current and Future Trends)
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Article
Effect of Tea Polyphenols on Curdlan/Chitosan Blending Film Properties and Its Application to Chilled Meat Preservation
Coatings 2019, 9(4), 262; https://doi.org/10.3390/coatings9040262 - 19 Apr 2019
Cited by 13 | Viewed by 1727
Abstract
Incorporating phenolic acids into polysaccharide films improves their physical properties, in turn improving their potential commercial applicability as a preservation material for different foods. This study aimed to develop films from curdlan and tea polyphenols, and determine the effect of their contents on [...] Read more.
Incorporating phenolic acids into polysaccharide films improves their physical properties, in turn improving their potential commercial applicability as a preservation material for different foods. This study aimed to develop films from curdlan and tea polyphenols, and determine the effect of their contents on the water vapor permeability (WVP) and mechanical properties (tensile strength and elongation at break) of the films. Different ratios of tea polyphenols were incorporated into the curdlan-based films to improve their properties. The results obtained showed that the tensile strength and elongation at break of films were likely to be significantly decreased by adding tea polyphenols, especially at a content of 0.6%, which resulted in a 50% decrease. Meanwhile, the WVP and moisture content of the films was also decreased. However, a low WVP can prevent moisture loss from food. Other film properties, such as antioxidant efficiency, were also investigated. The results showed that the antioxidant potential of the film can be improved by tea polyphenols. The composite films were also applied to the preservation of chilled meat, which resulted in the shelf life being extended by about 3–5 days. Some properties, such as water resistance and DPPH (1,1-diphenyl-2-picrylhydrazyl) free radical scavenging capacity of the composite film, were improved. Full article
(This article belongs to the Special Issue Biodegradable Films and Composite Coatings: Current and Future Trends)
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Title: Tensile and Thermal Properties of Supercritical Carbon Dioxide Impregnated Biocomposite Filled with Cinnamon Essential Oil

Authors: Hazleen Anuar
Affiliation: Department of Manufacturing and Materials Engineering, Kulliyyah of Engineering,International Islamic University Malaysia

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