Sharmin Nusrat, Pang Chengheng, Sone Izumi, Walsh James Leon, Fernández Cecilia Górriz, Sivertsvik Morten, Fernández Estefanía Noriega
Department of Food Safety and Quality, Nofima AS, Osloveien 1, 1430 Ås, Norway.
Department of Chemical and Environmental Engineering, University of Nottingham Ningbo China, Ningbo 315100, China.
Nanomaterials (Basel). 2021 Sep 5;11(9):2306. doi: 10.3390/nano11092306.
In this study, sodium alginate (SA)-based, eco-friendly nanocomposites films were synthesized for potential food packaging applications using silver nitrate (AgNO) as the metal precursor, reactive nitrogen and oxygen species (RNOS) created within plasma activated water (PAW), or through cold plasma treatment (CP) as reducing agent and SA as stabilizing agent. The formation of silver nanoparticles (AgNPs) was confirmed via the absorption peaks observed between 440 and 450 nm in UV-vis spectroscopy. The tensile strength (TS) and tensile modulus (TM) of the nanocomposite films were significantly higher than those of the SA films. An increase in the TS was also observed as the AgNP concentration was increased from 1 to 5 mM. The storage modulus (G') of the nanocomposite solution was higher than that of the SA solution. The synthesis of AgNPs resulted both in a higher solution viscosity and a more marked shear-thinning effect. The synthesized AgNPs showed antimicrobial activity against both Gram-positive () and Gram-negative () bacteria. The AgNPs were spherical in shape with an average size of 22 nm.
在本研究中，以海藻酸钠（SA）为基础，使用硝酸银（AgNO）作为金属前驱体、等离子体活化水（PAW）中产生的活性氮和氧物种（RNOS）或通过冷等离子体处理（CP）作为还原剂，以及SA作为稳定剂，合成了用于潜在食品包装应用的环保型纳米复合薄膜。通过紫外可见光谱在440至450nm之间观察到的吸收峰证实了银纳米颗粒（AgNP）的形成。纳米复合薄膜的拉伸强度（TS）和拉伸模量（TM）显著高于SA薄膜。随着AgNP浓度从1mM增加到5mM，TS也有所增加。纳米复合溶液的储能模量（G'）高于SA溶液。AgNP的合成导致溶液粘度更高且剪切变稀效应更明显。合成的AgNP对革兰氏阳性（）和革兰氏阴性（）细菌均显示出抗菌活性。AgNP呈球形，平均尺寸为22nm。
