Green synthesis of silver nanoparticles by aqueous extract of Dovyalis abyssinica fruit for antibacterial applications

M. A. Kebede, B. Sitotaw, Kidanemariam Teklay Hilawea
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Abstract

Green biosynthesis technique was employed to synthesize silver nanoparticles (AgNPs). Fresh citrus fruit of Dovyalis abyssinica (vernacular name Koshim) tree was extracted by distilled water to obtain phenolic natural compounds that have reducing capacity of metallic ions to the corresponding metallic nanoparticles, in this case, silver ion to silver nanoparticles. The appearance of the UV-Vis absorbance peak at 430 nm and the color change from pale yellow reaction mixture to reddish brown colored product solution have confirmed the formation of AgNPs. FTIR data has also shown the presence of organic components from the plant with the particles that may be used as capping agents to stabilize the formed particles and to control the size. The prepared nanoparticles and the plant extract have shown antibacterial property against E. coli and S. aureus, though the effect of the AgNPs was better than the plant extract. This study contributes for the development of environmentally friendly procedures in the preparation of nanoparticles for medicine, energy or environment.
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深海紫叶燕果实水提物绿色合成纳米银抗菌应用研究
采用绿色生物合成技术合成纳米银。本文采用蒸馏水提取新鲜的深草Dovyalis abyssinica(本地名Koshim)柑橘果实,得到具有金属离子还原成相应金属纳米粒子能力的酚类天然化合物,即银离子还原为银纳米粒子。在430 nm处出现了紫外可见吸收峰,反应混合物的颜色由淡黄色变为红棕色,证实了AgNPs的形成。FTIR数据还显示了来自植物的有机成分和颗粒的存在,这些颗粒可以用作封盖剂来稳定形成的颗粒并控制大小。制备的纳米颗粒和植物提取物对大肠杆菌和金黄色葡萄球菌均表现出抑菌作用,但AgNPs的抑菌效果优于植物提取物。该研究有助于开发用于医药、能源或环境的纳米颗粒制备的环境友好型程序。
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