Journal
CARBOHYDRATE POLYMERS
Volume 285, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2022.119234
Keywords
Active food packaging; Cellulose nanomaterials; Antibacterial activity; Barrier properties; Chitosan
Categories
Funding
- Key Technologies Research and Development Program [2019YFC1605904]
- National Natural Science Foundation of China [32102050]
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A double-layer nanocomposite film was prepared to improve the mechanical and barrier properties of cellulose and chitosan. The film showed high tensile strength, low permeabilities, and good antibacterial activity. It also exhibited excellent preservation effects in food packaging.
To improve the mechanical and barrier properties of cellulose and chitosan (CS) and to allow the application of volatile antibacterial benzyl isothiocyanate (BITC) in active packaging, a double-layer nanocomposite film was prepared. Cellulose nanofibers (CNF) were crosslinked with CS via genipin to build the substrate. Quaternized cellulose nanocrystals (QCNC) were synthesized for carrying BITC as the coating material. By the layer-by-layer self-assembly approach, CS-CNF/QCNC-BITC film was fabricated. This film possessed the tensile strength of 33.75 MPa, low permeabilities of oxygen (6.9 x 10(-17) m(3)/s.m.Pa) and moisture (1.2 x 10(-11) g/s.m.Pa), and good antibacterial activity with the inhibition zone diameters of 4.9, 4.2 and 2.7 cm against Escherichia coli, Salmonella typhimurium and Staphylococcus aureus. The total viable count, total volatile basic nitrogen and thiobarbituric acid-reactive substances of the chicken wrapped CS-CNF/QCNC-BITC were only 4.4 log CFU/g, 17.7 mg/100 g and 0.44 mg/kg at 14 days, indicating a potential application of CS-CNF/QCNC-BITC for food packaging.
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