Insights into the effect of carboxylated cellulose nanocrystals on mechanical and barrier properties of gelatin films for flexible packaging applications.

Autor: Leite LSF; Graduate Program in Materials Science and Engineering (PPGCEM), Federal University of São Carlos, Rod. Washington Luiz, Km 235, 13565-905 São Carlos, SP, Brazil; Nanotechnology National Laboratory for Agribusiness, LNNA, Embrapa Instrumentation, R. XV de Novembro, 1452, 13560-979 São Carlos, SP, Brazil; University Grenoble Alpes, CNRS, Grenoble INP, LGP2, F-38400 Grenoble, France. Electronic address: lilianesamara@gmail.com., Le Gars M; University Grenoble Alpes, CNRS, Grenoble INP, LGP2, F-38400 Grenoble, France. Electronic address: manonlegars@gmail.com., Azeredo HMC; Nanotechnology National Laboratory for Agribusiness, LNNA, Embrapa Instrumentation, R. XV de Novembro, 1452, 13560-979 São Carlos, SP, Brazil. Electronic address: henriette.azeredo@embrapa.br., Moreira FKV; Graduate Program in Materials Science and Engineering (PPGCEM), Federal University of São Carlos, Rod. Washington Luiz, Km 235, 13565-905 São Carlos, SP, Brazil; Multifunctional Packaging Group (GEF(m)), Department of Materials Engineering, Federal University of São Carlos, Rod. Washington Luis, Km 235, 13565-905 São Carlos, SP, Brazil. Electronic address: francys@ufscar.br., Mattoso LHC; Graduate Program in Materials Science and Engineering (PPGCEM), Federal University of São Carlos, Rod. Washington Luiz, Km 235, 13565-905 São Carlos, SP, Brazil; Nanotechnology National Laboratory for Agribusiness, LNNA, Embrapa Instrumentation, R. XV de Novembro, 1452, 13560-979 São Carlos, SP, Brazil. Electronic address: luiz.mattoso@embrapa.br., Bras J; University Grenoble Alpes, CNRS, Grenoble INP, LGP2, F-38400 Grenoble, France; Institut Universitaire de France (IUF), F-75000 Paris, France. Electronic address: julien.bras@grenoble-inp.fr.
Jazyk: angličtina
Zdroj: International journal of biological macromolecules [Int J Biol Macromol] 2024 Sep 16; Vol. 280 (Pt 3), pp. 135726. Date of Electronic Publication: 2024 Sep 16.
DOI: 10.1016/j.ijbiomac.2024.135726
Abstrakt: In this study, gelatin/carboxylated cellulose nanocrystal (cCNC) bionanocomposite films were developed as an eco-friendly alternative to non-biodegradable flexible plastic packaging. Cellulose nanocrystals were modified by 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-mediated oxidation (cCNC) to strategically interact with amino groups present in the gelatin macromolecular backbone. Gelatin/cCNC bionanocomposite films (0.5-6.0 wt% cCNC) obtained by solution casting were transparent to visible light while displayed high UV-blocking properties. The chemical compatibility between gelatin and cCNC was deepened by electrostatic COO - /NH 3 + interactions, as detected by FTIR spectroscopy and morphologically indicated by scanning electron microscopy (SEM). Accordingly, Young's modulus and tensile strength of films were largely increased by 80 and 64 %, respectively, specifically near the cCNC percolation threshold (4 wt%), whereas the water vapor permeability (WVP) was reduced by 52 % at the optimum 6.0 wt% cCNC content in relation to the non-reinforced gelatin matrix (0.10 vs. 0.18 g H 2 O mm m -2  h -1  kPa -1 ). The oxygen transmission rates (OTR) of the gelatin/cCNC bionanocomposites were < 0.01 cm 3  m- 2  day -1 , making them technically competitive to most promising biopolymers like polycaprolactone (PCL) and poly(lactic acid) (PLA). This study reveals how TEMPO-oxidized cellulose nanocrystals can broaden the performance of biodegradable gelatin films for use in packaging. The gelatin/cCNC bionanocomposites also represent an effective approach for designing newly sustainability-inspired flexible materials from the surface modification of nanocelluloses targeting specific interactions with protein structures.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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