The Incorporation of Carvacrol into Poly (vinyl alcohol) Films Encapsulated in Lecithin Liposomes
Instituto Universitario de Ingeniería de Alimentos para el Desarrollo, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain
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Polymers 2020, 12(2), 497; https://doi.org/10.3390/polym12020497
Received: 4 February 2020
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Revised: 19 February 2020
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Accepted: 22 February 2020
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Published: 24 February 2020
(This article belongs to the Special Issue Polymers in Agriculture and Food Science)
Lecithin-encapsulated carvacrol has been incorporated into poly (vinyl alcohol) (PVA) for the purpose of obtaining active films for food packaging application. The influence of molecular weight (Mw) and degree of hydrolysis (DH) of the polymer on its ability to retain carvacrol has been analysed, as well as the changes in the film microstructure, thermal behaviour, and functional properties as packaging material provoked by liposome incorporation into PVA matrices. The films were obtained by casting the PVA aqueous solutions where liposomes were incorporated until reaching 0 (non-loaded liposomes), 5 or 10 g carvacrol per 100 g polymer. The non-acetylated, high Mw polymer provided films with a better mechanical performance, but less CA retention and a more heterogeneous structure. In contrast, partially acetylated, low Mw PVA gave rise to more homogenous films with a higher carvacrol content. Lecithin enhanced the thermal stability of both kinds of PVA, but reduced the crystallinity degree of non-acetylated PVA films, although it did not affect this parameter in acetylated PVA when liposomes contained carvacrol. The mechanical and barrier properties of the films were modified by liposome incorporation in line with the induced changes in crystallinity and microstructure of the films.
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Keywords:
food packaging; encapsulation; PVA; degree of hydrolysis
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MDPI and ACS Style
Andrade, J.; González-Martínez, C.; Chiralt, A. The Incorporation of Carvacrol into Poly (vinyl alcohol) Films Encapsulated in Lecithin Liposomes. Polymers 2020, 12, 497. https://doi.org/10.3390/polym12020497
AMA Style
Andrade J, González-Martínez C, Chiralt A. The Incorporation of Carvacrol into Poly (vinyl alcohol) Films Encapsulated in Lecithin Liposomes. Polymers. 2020; 12(2):497. https://doi.org/10.3390/polym12020497
Chicago/Turabian StyleAndrade, Johana, Chelo González-Martínez, and Amparo Chiralt. 2020. "The Incorporation of Carvacrol into Poly (vinyl alcohol) Films Encapsulated in Lecithin Liposomes" Polymers 12, no. 2: 497. https://doi.org/10.3390/polym12020497
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