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    Eco-friendly gelatin films with rosin-grafted cellulose nanocrystals for antimicrobial packaging

    Year: 2020

    Journal: Int. J. Biol. Macromol., Volume 165, DEC 15, page 2974–2983

    Authors: Leite, LSF; Bilatto, S; Paschoalin, RT; Soares, AC; Moreira, FKV; Oliveira, ON; Mattoso, LHC; Bras, J

    Organizations: Investissements d'AvenirFrench National Research Agency (ANR) [ANR-11-LABX-0030, ANR-16-CARN-0025-0]; Plant Macromolecule Research Center (CERMAV); Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior - Brasil (CAPES)Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES) [001]; CNPqConselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPQ); SISNANO (MCTI); FINEPFinanciadora de Inovacao e Pesquisa (Finep); Embrapa AgroNano research network (EMBRAPA)Empresa Brasileira de Pesquisa Agropecuaria (EMBRAPA); Sao Paulo Research Foundation (FAPESP)Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [2016/03080-2, 2017/18725-2, 2018/00278-2, 2018/10899-4, 2018/22214-6, 2018/18953-8]

    Keywords: Gelatin; Rosin; Cellulose nanocrystal; Antimicrobial properties; Food packaging

    We report on gelatin films incorporating rosin-grafted cellulose nanocrystals (r-CNCs), which fulfill the most relevant requirements for antimicrobial packaging applications. Transparent gelatin/r-CNCs bionanocomposite films (0.5-6 wt% r-CNCs) were obtained by solution casting and displayed high UV-barrier properties, which were superior to the most used plastic packaging films. The gelatin/r-CNCs films exhibited a moderate water vapor permeability (0.09 g mm/m(2) h kPa), and high tensile strength (40 MPa) and Young's modulus (1.9 GPa). The r-CNCs were more efficient in improving the optical, water vapor barrier and tensile properties of gelatin films than conventional CNCs. Grafting of rosin on CNCs resulted in an antimicrobial nanocellulose that inhibited the growth of Staphylococcus aureus and Escherichia coli. The antibacterial properties of r-CNCs were sustained in the gelatin films, as demonstrated by agar diffusion tests and proof-of-principle experiments involving cheese storage. Overall, the incorporation of r-CNCs as active fillers in gelatin films is a suitable approach for producing novel eco-friendly, antimicrobial packaging materials. (c) 2020 Elsevier B.V. All rights reserved.
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