Microorganism-mediated green synthesis of silver nanoparticles using Aspergillus niger and Bacillus megaterium

Research in the field of nanotechnologies, the development of reliable and environmentally friendly processes for the synthesis of metallic nanoparticles constitutes an important element in this field. In this study, biosynthesis of silver nanoparticles using Bacillus megaterium and Aspergillus niger is reported. The results show that the characteristic UV-vis absorbance peak of AgNPs synthesized using Aspergillus niger was observed in the 433 - 448 nm range and around 475 nm with Bacillus megaterium. Most of the particles were spherical in shape and within a size range of 1 to 10.5 nm using Aspergillus niger and 3 to 15 nm with Bacillus megaterium. The FTIR analysis of AgNPs showed five absorbance bands at 3446, 1645, 1373, 1080, and 790 cm−1 . These AgNPs have potential antibacterial activity against Escherichia coli. The results of our study could help to improve the silver nanoparticle synthesis since our method makes them small, stable, and with a high antibacterial efficiency.