Department of Food Hygiene and Quality Control, Faculty of Veterinary Medicine, Urmia University, Urmia, Iran.
J Sci Food Agric. 2021 Jun;101(8):3439-3447. doi: 10.1002/jsfa.10974. Epub 2020 Dec 15.
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.
An optimized nanopaper including C-dots at a concentration of 530 g L 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.
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.
本研究从桑白皮提取物中合成了具有抗菌活性的碳点（C-dots），旨在使用细菌纳米纤维素（BNC）制备抗李斯特菌纳米纸。采用原位涂布法将高度分散的、尺寸小于 10nm（约 4.9nm）的合成 C-dots 浸渍到 BNC 中，然后评估其机械性能、形态、紫外防护和抗菌活性。采用中心复合设计的随机响应面法研究了 BNC 膜中 C-dots 的最佳浓度。
设计了一种包含 C-dots（浓度为 530g/L）和浸渍时间为 14h（30°C）的优化纳米纸，对单核细胞增生李斯特氏菌具有显著的抗菌活性。与断裂 BNC 相比，C-dots 的加入显著提高了 BNC 的极限拉伸强度并降低了应变。使用 C-dots 制备了具有高效紫外阻隔性能的 BNC 片材。
基于这些结果，设计的纳米纸在制备用于食品活性包装的抗菌/紫外阻隔片材方面具有很大的潜力。 © 2020 英国化学学会。
