Silva Iris O, Ladchumananandasivam Rasiah, Nascimento José Heriberto O, Silva Késia Karina O S, Oliveira Fernando R, Souto António P, Felgueiras Helena P, Zille Andrea
Department of Mechanical Engineering, Federal University of Rio Grande do Norte, Natal 59064-741, Brazil.
Department of Textile Engineering, Federal University of Rio Grande do Norte, Natal 59064-741, Brazil.
Nanomaterials (Basel). 2019 Jul 24;9(8):1064. doi: 10.3390/nano9081064.
Gold nanoparticles (AuNPs), chemically synthesized by citrate reduction, were for the first time immobilized onto chitosan-treated soybean knitted fabric via exhaustion method. AuNPs were successfully produced in the form of highly spherical, moderated polydisperse, stable structures. Their average size was estimated at ≈35 nm. Successful immobilization of chitosan and AuNPs were confirmed by alterations in the fabric's spectrophotometric reflectance spectrum and by detection of nitrogen and gold, non-conjugated C=O stretching vibrations of carbonyl functional groups and residual N-acetyl groups characteristic bands by X-ray photoelectron spectroscopy (XPS) and Fourier-Transform Infrared Spectroscopy (FTIR) analysis. XPS analysis confirms the strong binding of AuNPs on the chitosan matrix. The fabrics' thermal stability increased with the introduction of both chitosan and AuNPs. Coated fabrics revealed an ultraviolet protection factor (UPF) of +50, which established their effectiveness in ultraviolet (UV) radiation shielding. They were also found to resist up to 5 washing cycles with low loss of immobilized AuNPs. Compared with AuNPs or chitosan alone, the combined functionalized coating on soy fabrics demonstrated an improved antimicrobial effect by reducing adhesion (99.94%) and (96.26%). Overall, the engineered fabrics were confirmed as multifunctional, displaying attractive optical properties, UV-light protection and important antimicrobial features, that increase their interest for potential biomedical applications.
通过柠檬酸盐还原法化学合成的金纳米颗粒（AuNPs）首次通过竭染法固定在壳聚糖处理过的大豆针织物上。成功制备出了高度球形、多分散性适中且结构稳定的AuNPs。其平均尺寸估计约为35纳米。通过织物分光光度反射光谱的变化以及利用X射线光电子能谱（XPS）和傅里叶变换红外光谱（FTIR）分析检测氮和金、羰基官能团的非共轭C=O伸缩振动以及残留N-乙酰基特征带，证实了壳聚糖和AuNPs的成功固定。XPS分析证实了AuNPs与壳聚糖基质的强结合。随着壳聚糖和AuNPs的引入，织物的热稳定性提高。涂层织物的紫外线防护系数（UPF）为+50，这表明它们在紫外线（UV）辐射屏蔽方面具有有效性。还发现它们能够抵抗高达5次洗涤循环，固定的AuNPs损失较低。与单独的AuNPs或壳聚糖相比，大豆织物上的复合功能化涂层通过减少粘附（99.94%）和（96.26%）表现出更好的抗菌效果。总体而言，这些工程织物被确认为具有多功能性，展现出吸引人的光学性能、紫外线防护和重要的抗菌特性，这增加了它们在潜在生物医学应用方面的吸引力。
