Biopolymers for Food Packaging Films and Coatings II

A special issue of Polymers (ISSN 2073-4360). This special issue belongs to the section "Biomacromolecules, Biobased and Biodegradable Polymers".

Deadline for manuscript submissions: closed (30 November 2023) | Viewed by 3233

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Teagasc Moorepark Food Research Centre, Co. Cork, P61 C996 Fermoy, Ireland
Interests: fermented dairy products; probiotics; postbiotics; dairy technology; protein characterization
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Special Issue Information

Dear Colleagues,

In recent years, the use and development of biodegradable resources in the preparation of biopolymers has gained great importance among academics and industrialists, especially for food packaging applications. Hiring bio-based resources in place of petroleum-based materials to formulate polymeric composites has captivated a lot of attention in terms of environmental, economic, and sustainability concerns. Remarkably, it has been foretold that the worldwide turnover of bioplastic production will increase to about 2.6 times for a 5-year period (2017 to 2022), reaching ca. US$ 43.87. Such a huge marketplace has driven scientific research to utilize renewable resources. Biopolymers are commonly obtained from polysaccharides, proteins, and, somehow, lipid resources to generate biopolymer-based films and coatings. Furthermore, most of the biopolymers (cellulose, starch, chitosan, zein, etc.) are synthesized through the modification of cost-effective seafood, food processing, and agriculture byproducts.

Biopolymers, per se, have various mechanical, physical, and thermal drawbacks in comparison to frequently used polymers. In this respect, a number of approaches such as the incorporation of nanomaterials, crosslinkers, plasticizers, combination with other polymers/biopolymers, and utilization of functional bioactives and antimicrobials have been engaged to cope with these drawbacks. In addition to reinforcement methods, novel approaches to fabricate food packaging films and coatings are considered as well. All bio-based composite films and coatings are covered in this Special Issue through a rapid peer-review process in the form of research papers, reviews, and perspectives.

Dr. Farhad Garavand
Guest Editor

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Keywords

  • food packaging
  • biopolymers
  • coatings
  • films
  • nanocomposites

Published Papers (1 paper)

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Research

26 pages, 4141 KiB  
Article
Enhancing the Mechanical Properties of Corn Starch Films for Sustainable Food Packaging by Optimizing Enzymatic Hydrolysis
by Andra-Ionela Ghizdareanu, Alexandra Banu, Diana Pasarin, Andreea Ionita (Afilipoaei), Cristian-Andi Nicolae, Augusta Raluca Gabor and Delia Pătroi
Polymers 2023, 15(8), 1899; https://doi.org/10.3390/polym15081899 - 15 Apr 2023
Cited by 4 | Viewed by 2925
Abstract
The objective of this study was to investigate the effects of enzymatic hydrolysis using α-amylase from Bacillus amyloliquefaciens on the mechanical properties of starch-based films. The process parameters of enzymatic hydrolysis and the degree of hydrolysis (DH) were optimized using a Box–Behnken design [...] Read more.
The objective of this study was to investigate the effects of enzymatic hydrolysis using α-amylase from Bacillus amyloliquefaciens on the mechanical properties of starch-based films. The process parameters of enzymatic hydrolysis and the degree of hydrolysis (DH) were optimized using a Box–Behnken design (BBD) and response surface methodology (RSM). The mechanical properties of the resulting hydrolyzed corn starch films (tensile strain at break, tensile stress at break, and Young’s modulus) were evaluated. The results showed that the optimum DH for hydrolyzed corn starch films to achieve improved mechanical properties of the film-forming solutions was achieved at a corn starch to water ratio of 1:2.8, an enzyme to substrate ratio of 357 U/g, and an incubation temperature of 48 °C. Under the optimized conditions, the hydrolyzed corn starch film had a higher water absorption index of 2.32 ± 0.112% compared to the native corn starch film (control) of 0.81 ± 0.352%. The hydrolyzed corn starch films were more transparent than the control sample, with a light transmission of 78.5 ± 0.121% per mm. Fourier-transformed infrared spectroscopy (FTIR) analysis showed that the enzymatically hydrolyzed corn starch films had a more compact and solid structure in terms of molecular bonds, and the contact angle was also higher, at 79.21 ± 0.171° for this sample. The control sample had a higher melting point than the hydrolyzed corn starch film, as indicated by the significant difference in the temperature of the first endothermic event between the two films. The atomic force microscopy (AFM) characterization of the hydrolyzed corn starch film showed intermediate surface roughness. A comparison of the data from the two samples showed that the hydrolyzed corn starch film had better mechanical properties than the control sample, with a greater change in the storage modulus over a wider temperature range and higher values for the loss modulus and tan delta, indicating that the hydrolyzed corn starch film had better energy dissipation properties, as shown by thermal analysis. The improved mechanical properties of the resulting film of hydrolyzed corn starch were attributed to the enzymatic hydrolysis process, which breaks the starch molecules into smaller units, resulting in increased chain flexibility, improved film-forming ability, and stronger intermolecular bonds. Full article
(This article belongs to the Special Issue Biopolymers for Food Packaging Films and Coatings II)
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