Mn ₃O ₄ nanoparticles: Synthesis, characterization and their antimicrobial and anticancer activity against A549 and MCF-7 cell lines

Abstract

Due to their inexpensive and eco-friendly nature, and existence of manganese in various oxidation states and their natural abundance have attained significant attention for the formation of Mn ₃O ₄ nanoparticles (Mn ₃O ₄ NPs). Herein, we report the preparation of Mn ₃O ₄ nanoparticles using manganese nitrate as a precursor material by utilization of a precipitation technique. The as-prepared Mn ₃O ₄ nanoparticles (Mn ₃O ₄ NPs) were characterized by using X-ray powder diffraction (XRD), UV–Visible spectroscopy (UV–Vis), High-Resolution Transmission electron microscopy (HRTEM), Field emission scanning electron microscopy (FESEM), Thermal gravimetric analysis (TGA) and Fourier-transform infrared spectroscopy (FT-IR). The antimicrobial properties of the as-synthesized Mn ₃O ₄ nanoparticles were investigated against numerous bacterial and fungal strains including  S. aureus, E. coli,  B. subtilis, P. aeruginosa,  A. flavus and C. albicans. The Mn ₃O ₄ NPs inhibited the growth of  S. aureus with a minimum inhibitory concentration (MIC) of 40 μg/ml and C. albicans with a MIC of 15 μg/ml. Furthermore, the Mn ₃O ₄ NPs anti-cancer activity was examined using MTT essay against A549 lung and MCF-7 breast cancer cell lines. The Mn ₃O ₄ NPs revealed significant activity against the examined cancer cell lines A549 and MCF-7. The IC ₅₀ values of Mn ₃O ₄ NPs with A549 cell line was found at concentration of 98 µg/mL and MCF-7 cell line was found at concentration of 25 µg/mL.