Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Thymol@Natural Zeolite Nanohybrids for Chitosan/Poly-Vinyl-Alcohol Based Hydrogels Applied As Active Pads for Strawberries Preservation

Constantinos Ε Salmas
* ORCID logo ,
Eleni Kollia
ORCID logo ,
Learda Avdylaj
,
Anna Kopsacheili
,
Konstantinos Zaharioudakis
,
Stavros Georgopoulos
,
Areti Leontiou
ORCID logo ,
Katerina Katerinopoulou
ORCID logo ,
Georgios Kehayias
,
Anastasios Karakassides
,
Charalampos Proestos
* ORCID logo ,
Aris E Giannakas
* ORCID logo
Version 1 : Received: 8 June 2023 / Approved: 9 June 2023 / Online: 9 June 2023 (08:06:57 CEST)

A peer-reviewed article of this Preprint also exists.

Salmas, C.E.; Kollia, E.; Avdylaj, L.; Kopsacheili, A.; Zaharioudakis, K.; Georgopoulos, S.; Leontiou, A.; Katerinopoulou, K.; Kehayias, G.; Karakassides, A.; Proestos, C.; Giannakas, A.E. Thymol@Natural Zeolite Nanohybrids for Chitosan/Polyvinyl-Alcohol-Based Hydrogels Applied as Active Pads. Gels 2023, 9, 570. Salmas, C.E.; Kollia, E.; Avdylaj, L.; Kopsacheili, A.; Zaharioudakis, K.; Georgopoulos, S.; Leontiou, A.; Katerinopoulou, K.; Kehayias, G.; Karakassides, A.; Proestos, C.; Giannakas, A.E. Thymol@Natural Zeolite Nanohybrids for Chitosan/Polyvinyl-Alcohol-Based Hydrogels Applied as Active Pads. Gels 2023, 9, 570.

Abstract

Food saving and further valorization is of major interest in our days. Worldwide, scientists intensify their efforts to increase shelf life of products due to the global danger of coming food crisis. Even though many chemicals could achieve such target, the circular economy spirit and the global trend against the greenhouse effects impose the turn of research activities using environmentally friendly biomass materials, biowastes, and biodegradable materials. In this study, the promising biopolymer chitosan incorporated with the promising biodegradable polymer poly-vinyl-alcohol to produce a biopolymeric matrix. This biodegradable biopolymer was further mixed homogeneously with 15% thymol/nano-zeolite nanohybrid material and the final developed film was extremely improved compared to the relevant of chitosan/poly-vinyl-alcohol film. Mechanical properties were increased significantly i.e., 34% for Young Modulus and 46,5% for ultimate tensile strength, while the antioxidant activity increased by 53,4%. The antibacterial activity increased by 134% for Ecoli, 87,5% for Saureus, 32% for Lmonocytogenes, and 9% for Senterica. The water-vapor diffusion coefficient and the oxygen permeability coefficient decreased down to -51% and -74% respectively, and thus the water-vapor and oxygen barrier increased. In-vivo experiments on strawberries show an extension of 233% for shelf-life duration which resulted from the modified atmosphere by the control-released thymol.

Keywords

chitosan; poly-vinyl-alcohol; natural zeolite; thymol; active packaging; antibacterial activity; strawberry preservation

Subject

Chemistry and Materials Science, Surfaces, Coatings and Films

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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