Green Synthesis of Silver Nanoparticles by Extracellular Extracts from Aspergillus japonicus PJ01

文献类型： 外文期刊

第一作者： Li, Pei-Jun

作者： Li, Pei-Jun;Pan, Jiang-Juan;Tao, Li-Jun;Li, Xia;Shan, Yang;Li, Hai-Yun;Li, Pei-Jun;Su, Dong-Lin;Shan, Yang

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关键词： green synthesis; silver nanoparticles; extracellular extracts; antibacterial properties

期刊名称：MOLECULES （ 影响因子：4.412； 五年影响因子：4.588 ）

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年卷期： 2021 年 26 卷 15 期

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收录情况： SCI

摘要： The present study focuses on the biological synthesis, characterization, and antibacterial activities of silver nanoparticles (AgNPs) using extracellular extracts of Aspergillus japonicus PJ01.The optimal conditions of the synthesis process were: 10 mL of extracellular extracts, 1 mL of AgNO3 (0.8 mol/L), 4 mL of NaOH solution (1.5 mol/L), 30 degrees C, and a reaction time of 1 min. The characterizations of AgNPs were tested by UV-visible spectrophotometry, zeta potential, scanning electron microscope (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and thermogravimetric (TG) analyses. Fourier transform infrared spectroscopy (FTIR) analysis showed that Ag+ was reduced by the extracellular extracts, which consisted chiefly of soluble proteins and reducing sugars. In this work, AgNO3 concentration played an important role in the physicochemical properties and antibacterial properties of AgNPs. Under the AgNO3 concentration of 0.2 and 0.8 mol/L, the diameters of AgNPs were 3.8 +/- 1.1 and 9.1 +/- 2.9 nm, respectively. In addition, smaller-sized AgNPs showed higher antimicrobial properties, and the minimum inhibitory concentration (MIC) values against both E. coli and S. aureus were 0.32 mg/mL.

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