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1.
Improving bacterial cellulose films by ex-situ and in-situ modifications: a review
Patricia Cazon, Manuel Vazquez, 2021, pregledni znanstveni članek

Opis: The high intake of plastic materials for food packaging causes environmental problems due to the nonbiodegradable properties of these materials. High, low and very low-density polyethylene, polyethylene terephthalate, polyvinyl chloride, polystyrene and polypropylene are the main materials used. Biodegradable polymers from natural sources are potential raw materials to develop novel food packaging. Bacterial cellulose is a material with extraordinary properties that is gaining special interest for applications in the Food Industry. The excellent mechanical properties, thermal stability and barrier to water vapor, oxygen and UV radiation of bacterial cellulose compared to other polysaccharides make this material very attractive and a potential alternative to non-biodegradable synthetic materials. Nevertheless, bacterial cellulose films are limited due to their lower elasticity. Therefore, the aim of this review is to provide an overview of the ex-situ and in-situ modifications of bacterial cellulose to improve its properties for the development of films for food packaging.
Najdeno v: ključnih besedah
Povzetek najdenega: ...The high intake of plastic materials for food packaging causes environmental problems due to the... ...potential raw materials to develop novel food packaging. Bacterial cellulose is a material with extraordinary...
Ključne besede: Bacterial cellulose, In-situ modifications, Ex-situ modifications, Food packaging.
Objavljeno: 09.12.2020; Ogledov: 798; Prenosov: 0
.pdf Polno besedilo (1,90 MB)

2.
Mechanical and barrier properties of chitosan combined with other components as food packaging film
Patricia Cazon, Manuel Vazquez, 2019, pregledni znanstveni članek

Opis: Chitosan is an alternative to synthetic polymers for food packaging. The mechanical and barrier properties of pure chitosan films are promising. Chitosan properties can be modified by combining chitosan with other components such as plasticizers, other polysaccharides, proteins and lipids. Here we review mechanical and barrier properties of composite films based on chitosan. The major points are: (1) compared with synthetic plastic films, an important limitation of chitosan-based films is their mechanical properties, especially their capacity to elongation; (2) chitosan is a polymer that allows an easy combination with other polysaccharides, plasticizers, proteins and lipids; (3) this allows to develop mixed components and modify the film properties according to the nature of the food to be packaged.
Najdeno v: ključnih besedah
Ključne besede: Chitosan, Film, Mechanical properties, Barrier properties, Food packaging
Objavljeno: 09.12.2020; Ogledov: 810; Prenosov: 0
.pdf Polno besedilo (846,53 KB)

3.
Applications of Chitosan as Food Packaging Materials
Manuel Vazquez, Patricia Cazon, 2019, recenzija, prikaz knjige, kritika

Opis: The interest in biopolymers has increased due to the depletion of the fossil fuel reserve and the environmental impact caused by the accumulation of non-biodegradable plastic-based packaging materials. Many biopolymers have been developed from food waste products to reduce this waste and, at the same time, to obtain new food packaging materials. Chitosan is thus an alternative to synthetic polymers, and a raw material for new materials. To assess the suitability of a material as a food packaging material, it is necessary to study their mechanical and permeability properties. Mechanical properties allow to predict the behaviour of films during transportation, handling and storage of packaged foods. Barrier properties play a key role in maintaining the food product quality. Properties values depend on the type of chitosan used. Mechanical and barrier properties of pure chitosan films are suitable for food packaging and active packaging. These properties can be modified by combining chitosan with other components such as plasticizers, other polysaccharides, proteins and lipids. These combinations adapt the properties of the final polymer to the needs of the food to extend its useful life, while maintaining quality properties of the food and the biodegradability of the polymer. Chitosan displays antimicrobial activity against a wide range of foodborne filamentous fungi, yeast, and gram-negative and gram-positive bacteria. This antimicrobial property and film-forming capacity has made chitosan the reference polymer to develop active packaging with the ability to inhibit the growth of microorganisms and improve food safety. Regarding the optical properties, pure chitosan films in the visible range show high transmittance values, being optically transparent films. This is an important parameter related to the acceptability of the films by the consumer. In addition, chitosan-based films exhibit remarkable UV absorbance, which allows to protect food from lipid oxidations induced by UV radiation.
Najdeno v: ključnih besedah
Ključne besede: Film, Mechanical properties, Barrier properties, Antimicrobial, UV protect, Active food packaging
Objavljeno: 14.12.2020; Ogledov: 795; Prenosov: 0
.pdf Polno besedilo (701,19 KB)

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