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Study on Biological Synthesis of Cadmium Sulfide Nanoparticles by Bacillus licheniformis and Its Antimicrobial Properties against Food Borne Pathogens

Aishwarya Shivashankarappa, K R Sanjay

Nanoscience and Nanotechnology Research. 2015, 3(1), 6-15 doi:10.12691/nnr-3-1-2
  • Figure 1. Biosynthesized CdS nanoparticles by Bacillus licheniformis with different ratios of cadmium chloride and sodium sulfide 1:1, 2:1, 3:1 and 4:1 respectively
  • Figure 2. UV- visible absorption spectrum of CdS nanoparticles of all four ratios 1:1, 2:1, 3:1 and 4:1
  • Figure 3. SEM micrograph of CdS nanoparticles taken at a scale bar of 2 μm. Images of different ratios of cadmium chloride and sodium sulfide 1:1 (a), 2:1 (b), 3:1 (c) and 4:1 (d)
  • Figure 4. EDX analysis of biosynthesized CdS nanoparticles. Graphs plotted for different ratios 1:1 (a), 2:1 (b), 3:1 (c) and 4:1 (d) shows the presence of Cd and S metals
  • Figure 5. FTIR spectra recorded for CdS nanoparticles of all ratios 1:1 (a), 2:1 (b), 3:1 (c) and 4:1 (d)
  • Figure 6. X-Ray Diffraction pattern of powder CdS nanoparticles of ratios 1:1 (a), 2:1 (b), 3:1 (c) and 4:1 (d) showing peaks at 111, 200, 220 and 311 of the lattices planes
  • Figure 7. Antimicrobial activity of CdS nanoparticles against five food borne pathogens. (a) Pseudomonas aeruginosa, (b) Bacillus licheniformis, (c) Bacillus cereus, (d) E coli and (e) Staphylococcus aureus
  • Figure 8. Antimicrobial activity of standard antibiotics against five food borne pathogens. (a) Pseudomonas aeruginosa, (b) Bacillus licheniformis, (c) Bacillus cereus, (d) E coli and (e) Staphylococcus aureus
  • Figure 9. Antifungal activity of CdS nanoparticles against three food borne fungi. (a) Aspergillus flavus, (b) Fusarious oxysporum and (c) Penicillium expansum