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<p>The synthesis of metal oxide nanoparticles in a cost-effective, environmentally friendly, and sustainable manner is of utmost importance for their utilization in various nanotechnology sectors. This research study focuses on the biogenic production of TiO2 nanoparticles (NPs) using the nano-factory of <i>Bacillus megaterium</i>. To characterize TiO2 NPs synthesized through this biological process, techniques including FT-IR, FESEM, EDS, BET, and XRD were employed. Biosynthesized nanoparticles exhibited an amorphous structure, spherical shape, and a mean diameter of 92.94&#xa0;nm. The resulting nanoparticles underwent calcination at 500&#xa0;°C to enhance their properties. This calcination transformed the amorphous TiO2 NPs into an anatase crystalline structure and eliminated organic impurities from <i>Bacillus megaterium</i>, present in the cell-free supernatant (CFS). The antibacterial activity of the biosynthesized TiO2 NPs was assessed using the colony-forming unit (CFU) method. Additionally, the minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) were determined to evaluate their antimicrobial properties.</p>

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Bacillus Megaterium as TiO2 Nano-Factory: Biosynthesis, Characterization, and Antibacterial Activity

  • 期刊论文

  • 发表日期：

    2025年1月27日

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  • Zahra Latifi Aziz,
  • Sara Daneshjou

摘要

The synthesis of metal oxide nanoparticles in a cost-effective, environmentally friendly, and sustainable manner is of utmost importance for their utilization in various nanotechnology sectors. This research study focuses on the biogenic production of TiO2 nanoparticles (NPs) using the nano-factory of Bacillus megaterium. To characterize TiO2 NPs synthesized through this biological process, techniques including FT-IR, FESEM, EDS, BET, and XRD were employed. Biosynthesized nanoparticles exhibited an amorphous structure, spherical shape, and a mean diameter of 92.94 nm. The resulting nanoparticles underwent calcination at 500 °C to enhance their properties. This calcination transformed the amorphous TiO2 NPs into an anatase crystalline structure and eliminated organic impurities from Bacillus megaterium, present in the cell-free supernatant (CFS). The antibacterial activity of the biosynthesized TiO2 NPs was assessed using the colony-forming unit (CFU) method. Additionally, the minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) were determined to evaluate their antimicrobial properties.