Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Thymol Modified Activated Carbon Nanohybrids for Chitosan/Poly-Vinyl-Alcohol Based Active Coatings

Constantinos E. Salmas
* ORCID logo ,
Areti Leontiou
ORCID logo ,
Eleni Kollia
ORCID logo ,
Konstantinos Zaharioudakis
,
Anna Kopsacheili
,
Learda Avdylaj
,
Stavros Georgopoulos
,
Vassilios K. Karabagias
,
Andreas Karydis-Messinis
,
George Kehayias
,
Charalampos Proestos
* ORCID logo ,
Aris E. Giannakas
* ORCID logo
Version 1 : Received: 27 July 2023 / Approved: 27 July 2023 / Online: 27 July 2023 (12:12:30 CEST)

A peer-reviewed article of this Preprint also exists.

Salmas, C.E.; Leontiou, A.; Kollia, E.; Zaharioudakis, K.; Kopsacheili, A.; Avdylaj, L.; Georgopoulos, S.; Karabagias, V.K.; Karydis-Messinis, A.; Kehayias, G.; Proestos, C.; Giannakas, A.E. Active Coatings Development Based on Chitosan/Polyvinyl Alcohol Polymeric Matrix Incorporated with Thymol Modified Activated Carbon Nanohybrids. Coatings 2023, 13, 1503. Salmas, C.E.; Leontiou, A.; Kollia, E.; Zaharioudakis, K.; Kopsacheili, A.; Avdylaj, L.; Georgopoulos, S.; Karabagias, V.K.; Karydis-Messinis, A.; Kehayias, G.; Proestos, C.; Giannakas, A.E. Active Coatings Development Based on Chitosan/Polyvinyl Alcohol Polymeric Matrix Incorporated with Thymol Modified Activated Carbon Nanohybrids. Coatings 2023, 13, 1503.

Abstract

Food waste disposal to landfills practice contributes to greenhouse problem due to the emission of gases such as methane to the atmosphere. Shelf-life extension of food products and further valorization of food wastes such as the conversion to activated carbon are tested nowadays as alternative techniques. The development and use of biobased active coatings against food oxidation/bacterial deterioration is an environmentally friendly technique. In this study, a novel food active coating was successfully developed based on a chitosan (CS)/poly-vinyl alcohol (PVOH) matrix activated with a nanohybrid of natural thymol (TO) adsorbed in activated carbon (AC) derived from spent coffee. The results shown that, compared to the pure CS/PVOH polymeric matrix, the coating with 15% wt. TO@AC nanohybrid concentration achieved +23.5 % Young’s modulus value, +20.1% ultimate strength value, increased barrier of +50.2% for water and +74.0 % for oxygen, +69.0% antioxidant activity, increased antibacterial activity of +5.5% against Escherichia coli, +17.8% against Salmonella enterica, +42.5% against Staphylococcus aureus, and +2.5% against Listeria monocytogenes. A visual evaluation of this coating shown a delay to fresh bananas enzymatic browning and significantly decrease their weight loss. This indicates that it could be potentially used to extend the shelf-life of fresh fruits.

Keywords

shelf life; biomass valorization; spent coffee; activated carbon; thymol; chitosan; poly-vinyl-alcohol; nanohybrids; control release; active coatings; bananas 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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