Naslov
Bioactive antioxidant coatings for poly(lactic acid) packaging films: polyphenols affect coating structure and their release in a food simulant

Autori
Mlaouah, Emma ; Benbettaieb, Nasreddine ; Kurek, Mia ; Galić, Kata ; Debeaufort, Frédéric

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
First CIRCUL-A-BILITY confeence, Re-thinking packaging for circular and sustainable food supply chains of the future / - , 2021, 13-13

Skup
1ST CIRCUL-A-BILITY Conference Rethinking packaging for circular and sustainable food supply chains of the future

Mjesto i datum
Foggia, Italija, 26.09.2021. - 29.09.2021

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
Bioactive, coatings, PLA, food simulants
(bioaktivne, prevlake, PLA, simulanti hrane)

Sažetak
The use of PLA for food packaging is limited because of its insufficient barrier properties in wet environments. One of the strategies to overcome these drawbacks is the deposition of thin coatings that can either reduce transfer through the films or serve as a support for bioactive molecules to provide active functions. The choice of using natural biopolymers incorporating bioactive agents on PLA makes it possible to develop active packaging materials while maintaining biodegradability and allowing for food contact. Fish gelatin coatings containing two phenolic acids (tannic and gallic) have been tested, both as antioxidants and for their ability to cross-link proteins. The coated PLA films show reduced moisture permeability and proven antioxidant properties. The release kinetics in a simulating medium were modelled. The incorporation of phenolic acids modifies the interactions with gelatin and the network structure which affects the release kinetic parameters. A synergistic effect of the antioxidant activity of the two phenolic acids was observed when they were mixed, due to a sequential release of gallic acid followed by tannic acid. Furthermore, the order of mixing of the two acids has a significant impact on the barrier and thermal properties of the films. The partition coefficient (KF/S) depends both on interactions with gelatin (tannic acid) but also of the solubility in the simulant (gallic acid) whereas the diffusivity only varied by two between the two acids, related to both interactions and molecular size. Molecular interactions, solubility of antioxidants in the simulant and structural properties of the gelatin network affect the transfer parameters.The design of an active packaging based on natural substances is a complex process for which a multidisciplinary knowledge (chemistry, physical chemistry, engineering, biochemistry...) is necessary.

Izvorni jezik
Engleski

Znanstvena područja
Prehrambena tehnologija

POVEZANOST RADA