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Optimization and characterization of eco‐friendly antimicrobial nanocellulose sheet prepared using carbon dots of white mulberry ( Morus alba L.)
Author(s) -
Salimi Fatemeh,
Moradi Mehran,
Tajik Hossein,
Molaei Rahim
Publication year - 2021
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.10974
Subject(s) - antimicrobial , nanocellulose , ultimate tensile strength , food packaging , materials science , listeria monocytogenes , nanotechnology , chemistry , composite material , food science , cellulose , organic chemistry , bacteria , biology , genetics
BACKGROUND Carbon dots (C‐dots) with antimicrobial activity were synthesized from the white mulberry extract with the aim of fabricating anti‐listeria nanopaper using bacterial nanocellulose (BNC). Highly dispersed synthesized C‐dots with a size smaller than 10 nm (approximately 4.9 nm) were impregnated into BNC by an ex situ coating method and then mechanical, morphological, UV‐protectant and antibacterial activity were assessed. Randomized response surface methodology using a central composite design was applied to investigate the optimized concentration of C‐dots in the BNC membrane. RESULTS An optimized nanopaper including C‐dots at a concentration of 530 g L −1 and an impregnation time of 14 h at 30 °C with significant antimicrobial activity on Listeria monocytogenes was designed. The addition of C‐dots into BNC significantly increased ultimate tensile strength and decreased strain with respect to breaking BNC. A BNC sheet with high‐efficient UV‐blocking property was prepared using C‐dots. CONCLUSION Based on the results, the designed nanopaper shows a substantial capacity with respect to the fabrication of antimicrobial/UV‐blocking sheets for food active packaging. © 2020 Society of Chemical Industry