In recent years, nanostructures have received much attention from researchers in the field of science and technological applications and are in continuous development. Nanotechnology due to the multifunctional properties of nanomaterials, has wide applications in different fields such as food industry, space, electronics and optics, wastewater treatment, as well as in the fields of biology and medicine. Among the various nanoparticles, nanomanganese is important because of its abundance, low cost, availability, multiple ion capacities, and various compounds. Besides, manganese nanoparticles have different oxides with various crystal shapes and sizes and so varied applications. Bacterial production of nanoparticles is an environmentally friendly and inexpensive green synthesis method. Biological synthesis of manganese nanoparticles mediated by bacteria has been very limited worldwide, and in this study, we examined the production of manganese nanoparticles by bacteria isolated from the soil of Zagros Mountains. After examining 28 bacterial strains and testing their tolerance and survival in 25 mM manganese salt, 4 bacteria were selected and after testing different production methods, bacterium 13 (B13) could synthesize a blackish brown precipitate in the extracellular method. Characterization tests confirmed that this bacterium has the ability to produce manganese nanoparticles.

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