Biological approach in nanobiotechnology – screening of four food pathogenic bacteria extract ability in extracellular biosynthesis of gold nanoparticles
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Gold nanoparticles (Au NPs) were hydrothermally synthesized at 121 °C and 1.5 bar for 15 min, using four foodborne pathogens extracts namely, Bacillus cereus, Escherichia coli, Staphylococcus aureus and Salmonella entericasubsp.enterica. Fourier transform infrared spectroscopy indicated that hydroxyl and amide groups were two main functional groups which those were existed in all provided bacterial extracts and had key roles in the reduction and stabilizing processes. Particle size, polydispersity index (PDI), zeta potential, broad emission peak (λmax) and concentration of fabricated Au NPs were assessed using UV-Vis spectrophotometer and dynamic light scattering (DLS) particle size analyzer. Results indicated that, synthesized Au NPs using S. aureus had minimum particle size (51.11 nm) and PDI (0.599), with zeta potential value of 15.3 mV, and concentration (0.04 ppm) values, which were more desirable as compared to those of synthesized Au NPs using other three bacterial extracts.
KeywordsBacteria extract Extracellular synthesis Gold nanoparticles Hydrothermal method Pathogens
Analysis of variance
- Au NPs
deionized distilled water
Dynamic light scattering
Fourier transform infrared
Particle size distribution
Persian type culture collection
Surface Plasmon resonance
Broad emission peak
The authors appreciate the supports of Islamic Azad University-Tabriz branch to accomplish this research.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
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