Green Synthesis of Cr_2O_3 Nanoparticles Using Tridax procumbens Leaf Extract and its Antibacterial Activity on Escherichia coli

摘要

Chromium oxide nanoparticles (NPs) were rapidly synthesized by reduction of potassium dichromate solution with a Tridax procumbens leaf extract containing carbohydrates as a major component which act as reducing agent. The results indicated that water-soluble carbohydrates which have aldehyde group may cause the fonnation of Cr_2O_3 nanoparticles. The purification process of the Cr_2O_3 product does not require expensive methods, since a solid product is obtained from a reaction in liquid phase. The antibacterial effect of Cr_2O_3 nanoparticles against Escherichia coli was investigated as a model for Gram-negative bacteria. Bacteriological tests were performed in Luria-Bertani (LB) medium on solid agar plates and in liquid systems supplemented with different concentrations of nanosized Cr_2O_3 particles. These particles were shown to be an effective bactericide. The resulting Cr_2O_3 nanoparticles were characterized by X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), UV-VIS absorption and Fourier-transform infrared (FTIR) spectroscopy.