Abstract

In the present study, green synthesis of silver nanoparticles (AgNPs) was performed using flower extracts of Aerva lanata (Al) from Amaranthaceae family. The size, shape, and elemental composition of the silver nanoparticles (AgNPs) was studied using transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), and UV-visible spectroscopy. The dynamic light scattering (DLS), of silver nanoparticles (AgNPs) exhibited mean size of 7.6 nm in the range of 5–15 nm, having a poly-dispersed indexed value of 0.419. Zeta potential contributing to the stability of silver nanoparticles was recorded as −18.7 mV. Transmission electron microscopy (TEM) and energy dispersive X-ray (EDX) analysis confirmed the presence of the synthesized AgNPs with an average size range 7 ± 3 nm. The biosynthesized silver nanoparticles displayed antibacterial activity against Gram-positive and Gram-negative bacteria. The 2,2’-Diphenyl-1-picrylhydrazyl (DPPH) radical scavenging assay revealed antioxidant potential of silver nanoparticles in the concentration of 100 µg/ml. The photocatalytic activity of silver nanoparticles was evaluated using decolourization of the dyes under the sunlight using UV-Vis. spectroscopy. The results suggest that biosynthesized silver nanoparticles from A. lanata (Al-AgNPs) flower extracts have broad spectrum antibacterial, antioxidant and catalytic activities may be useful in a variety of biomedical and industrial applications.

摘要

在本研究中，银纳米粒子 (AgNPs) 的绿色合成是使用毛苋花提取物进行的。(Al) 来自苋科。使用透射电子显微镜 (TEM)、扫描电子显微镜 (SEM)、能量色散 X 射线分析 (EDX) 和紫外-可见光谱研究了银纳米粒子 (AgNPs) 的尺寸、形状和元素组成。银纳米粒子 (AgNPs) 的动态光散射 (DLS) 在 5-15 nm 范围内的平均尺寸为 7.6 nm，多分散指数值为 0.419。有助于银纳米粒子稳定性的 Zeta 电位记录为 -18.7 mV。透射电子显微镜 (TEM) 和能量色散 X 射线 (EDX) 分析证实了平均尺寸范围为 7 ± 3 nm 的合成 AgNPs 的存在。生物合成的银纳米粒子对革兰氏阳性菌和革兰氏阴性菌具有抗菌活性。2、2'-Diphenyl-1-picrylhydrazyl (DPPH) 自由基清除试验揭示了浓度为 100 µg/ml 的银纳米颗粒的抗氧化潜力。使用 UV-Vis 在阳光下通过染料脱色来评估银纳米颗粒的光催化活性。光谱学。结果表明，生物合成的银纳米颗粒来自A. lanata (Al-AgNPs) 花提取物具有广谱抗菌、抗氧化和催化活性，可用于各种生物医学和工业应用。