16 research outputs found
Dried-state bacterial cellulose (Acetobacter xylinum) and polyvinyl-alcohol-based hydrogel: An approach to a personal care material
Preparation of chitosan/hydrolyzed collagen/hyaluronic acid based hydrogel composite with caffeic acid addition
Electrospun characteristics of gallic acid-loaded poly vinyl alcohol fibers: Release characteristics and antioxidant properties
The Encapsulation of Green Tea Extract in Cyclodextrin and Loading into Chitosan-Based Composites: Controlled-Release Behavior and Antioxidant Properties
Characterization of the physical properties and biological activity of chitosan films grafted with gallic acid and caffeic acid: A comparison study
Nitric oxide releasing chitosan-poly (vinyl alcohol) hydrogel promotes angiogenesis in chick embryo model
Effect of carvacrol in the properties of films based on poly (vinyl alcohol) with different molecular characteristics
[EN] Poly (vinyl alcohol) (PVA) is a hydrophilic linear polymer obtained from the controlled hydrolysis of poly (vinyl acetate) (PVAc). The molecular weight (Mw) and degree of hydrolysis (DH) of PVA are considered relevant in both the functionality of the polymer and its capacity for film formation. This study analysed the influence of the Mw and DH of PVA on both the film's ability to incorporate carvacrol (CA), for the purposes of obtaining active films for food packaging application, as well as on the film microstructure, thermal behaviour and its functional properties as packaging material. CA was incorporated at 5 and 10 g/100 g polymer by emulsification in the polymer-water solutions, while the films were obtained by casting. The higher Mw polymer provided films with a better mechanical performance but less CA retention and a more heterogeneous structure. In contrast, low Mw, partially acetylated PVA gave rise to homogenous films with a higher CA content that increased the mechanical resistance and stretchability of the films. The melting temperature of this polymer with acetyl groups was lower than the degradation temperature, which makes thermoprocessing feasible.The authors would like to thank the financial support from the Ministerio de Economia y Competitividad (MINECO) of Spain, through the project AGL2016-76699-R. Author Johana Andrade thanks the Departamento de Narino-Colombia y la Fundacion CEIBA for the doctoral grant. The authors also thank the services rendered by the Electron Microscopy Service of the UPV.Andrade, J.; González Martínez, MC.; Chiralt Boix, MA. (2020). Effect of carvacrol in the properties of films based on poly (vinyl alcohol) with different molecular characteristics. 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