UV-Shielding films of bacterial cellulose with glycerol and chitosan. Part 2: Structure, water vapor permeability, spectral and thermal properties

Abstract

Bacterial cellulose films synthesized by Komagataeibacter xylinus were combined with glycerol and chitosan to obtain composite films with improved UV-barrier. In part 2, the interaction among the compounds was analyzed by scanning electron microscopy, UV-Vis and FT-IR spectra, thermogravimetry, and differential scanning calorimetry. The water permeability, water solubility and water retention capacity were analyzed by response surface methodology. The optical properties indicated that glycerol and chitosan improved the UV-barrier properties, obtaining average transmittance values in the UV regions below 5.15%. This fact opens multiple possibilities for applications in foods and products sensitive to sunlight radiation. Hence, these properties would facilitate the application of BC-glycerol-chitosan films on fresh food, with high moisture content and susceptible to oxidation by the sunlight radiation. In addition, the thermal properties of the films showed that they could be applied in heat-treated foods at temperatures until 135°C.Películas con protección UV de celulosa bacteriana, glicerol y quitosano. Parte 2: Estructura, permeabilidad al vapor de agua, propiedades espectrales y térmicas RESUMEN Las películas de celulosa bacteriana sintetizadas por Komagataeibacter xylinus se combinaron con glicerol y quitosano para obtener películas compuestas con propiedades de barrera contra la radiación UV mejoradas. En la parte 2, la interacción entre los compuestos se analizó mediante microscopía electrónica de barrido, espectros UV-Vis y FT-IR, termogravimetría y calorimetría diferencial de barrido. La permeabilidad al vapor de agua, la solubilidad en agua y la capacidad de retención de agua se analizaron mediante la metodología de superficie de respuesta. Las propiedades ópticas indicaron que el glicerol y el quitosano mejoraron las propiedades de barrera a los rayos UV, obteniendo valores de transmitancia promedio en las regiones UV por debajo de 5,15%. Este hecho abre múltiples posibilidades de aplicación en alimentos y productos sensibles a la radiación solar. Por tanto, estas propiedades facilitarían la aplicación de películas de BC-glicerolquitosano sobre alimentos frescos, con alto contenido de humedad y susceptibles de oxidación por la radiación solar. Además, las propiedades térmicas de las películas mostraron que podrían aplicarse con alimentos tratados térmicamente a temperaturas de hasta 135°C.

Development of Antioxidant and Antimicrobial Membranes Based on Functionalized and Crosslinked Chitosan for Tissue Regeneration

“…This phenomenon was due to the cizing effect of GLY (interposition of GLY molecules between the chains of CS), caused a decrease in the ordered regions in the structure of the pristine CS. Furthe the introduction of GLY caused an increase in the temperature of the first weigh relative to the absorbed water around 110-120 °C, and the formation of a further w loss between 170 and 200 °C due to the degradation of GLY, as reported by Vázque [63].…”

Biogenic sunflower oil-chitosan decorated fly ash nanocomposite film using white shrimp shell waste: Antibacterial and immunomodulatory potential

“…Silver and gold/chitosan nanocomposites films displayed inhibitory effects towards various bacterial strains [ 38 ]. Chitosan has also exerted excellent film layer abilities with an exceptional gas barrier, improved permeability of water vapor, protection from Ultra-violet light [ 39 ], and showed promising ability to encapsulate therapeutic drugs as well as release them in a regulated manner [ 40 ]. Moreover, its cationic feature facilitates effective polyelectrolyte interactions and ionic linkages with multivalent anions, which makes it easy to derivatize or functionalize [ 41 ].…”

New Isolated Shrimp (Litopenaeus setiferus) Chitosan-Based Films Loaded with Fly Ash for Antibacterial Evaluation

“…It has also been widely utilized for food packaging [ 22 ], drug delivery [ 23 ], and wound dressing [ 24 ] applications. Chitosan has displayed remarkable film coating abilities with an excellent gas barrier, improved permeability of water vapor, and protection from UV light [ 25 ]. It has a promising ability to encapsulate therapeutic drugs and release them over time in a regulated manner [ 26 ].…”