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Title: Antioxidant and antimicrobial films based on brewers spent grain arabinoxylans, nanocellulose and feruloylated compounds for active packaging
Author: Moreirinha, Catarina
Vilela, Carla
Silva, Nuno H.C.S.
Pinto, Ricardo J.B.
Almeida, Adelaide
Rocha, M. Angélica M.
Coelho, Elisabete
Coimbra, Manuel A.
Silvestre, Armando J.D.
Freire, Carmen S.R.
Keywords: Arabinoxylans
Brewers' spent grain
Nanofibrillated cellulose
Feruloylated compounds
Nanocomposite films
Active food packaging
Issue Date: Nov-2020
Publisher: Elsevier
Abstract: In this study, brewers spent grain (BSG) arabinoxylans-based nanocomposite films were prepared by solvent casting of arabinoxylans (AX) suspensions containing different amounts of nanofibrillated cellulose (NFC, 5, 10, 25, 50 and 75% mass fraction). The obtained nanocomposite films were homogeneous and presented thermal stability up to 230 °C and good mechanical properties (Young's modulus up to 7.5 GPa). Additionally, the films with 50% NFC were loaded with ferulic acid or feruloylated arabinoxylo-oligosaccharides enriched fraction from BSG (75 mg per g of film). This combination enhanced the UV–Vis barrier properties and imparted additional functionalities to the films, namely (i) antioxidant activity up to 90% (DPPH scavenging activity), (ii) antibacterial activity against Gram-positive (Staphylococcus aureus) and Gram-negative (Escherichia coli) bacteria, and (iii) antifungal activity towards the polymorphic fungus Candida albicans. Therefore, these fully biobased nanocomposite films show potential for application as active food packaging systems.
Peer review: yes
DOI: 10.1016/j.foodhyd.2020.105836
ISSN: 0268-005X
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