Biotechnology
Rana A. Hikmet; Nehia N. Hussein
Abstract
This study was carried out for the mycosynthesis of silver nanoparticles by Candida albicans supernatant. All the isolates used in this study were taken from the patients who existed at Al-Elweya children's teaching hospital in Baghdad, Iraq. Mycosynthesized silver nanoparticles were characterized ...
Read More ...
This study was carried out for the mycosynthesis of silver nanoparticles by Candida albicans supernatant. All the isolates used in this study were taken from the patients who existed at Al-Elweya children's teaching hospital in Baghdad, Iraq. Mycosynthesized silver nanoparticles were characterized by color visualization, ultraviolet-visible (UV) spectroscopy, and Fourier transform infrared spectroscopy (FTIR). The UV-Vis spectroscopy examination has shown the highest absorbance (λmax) at the wavelength of 429 nanometers, which indicated the creation of silver nanoparticles. Furthermore, the results of the antibacterial potential of AgNO3 and AgNPs against Klebsiella pneumoniae and Staphylococcus haemolyticus bacteria showed the highest effect of AgNO3 against Staphylococcus haemolyticus when the diameter of the inhibition zone reached (14.00 mm). In contrast, the lowest effect of the AgNO3 was with the diameter of the inhibition zone that reached (11.66 mm). The highest effect of the AgNO3 against Klebsiella pneumoniae by the diameter of the inhibition zone was reached (12.66mm), while the lowest effect was (9.00mm). The highest effect of the AgNPs against Klebsiella pneumoniae by the diameter of the inhibition zone reached (16.00mm), while the lowest effect was (13.00mm). The highest effect of the AgNPs against Staphylococcus haemolyticus by the diameter of the inhibition zone was reached (17.33mm). Where the lowest effect by the diameter of the inhibition zone was reached (14.00mm). Interestingly, this revealed that Staphylococcus haemolyticus was more susceptible to silver nitrate (AgNO3) and silver nanoparticles (AgNPs) than Klebsiella pneumoniae.
Biotechnology
Raghad Jabbar; Nehia N. Hussein
Abstract
Biosynthesis of AgNPs is a new approach in the field of nanotechnology with optimistic implementation in medicine, food control, and pharmacology. In this study, the silver nanoparticles were produced by Lactobacillus gasseri filtrate. The production of AgNPs was confirmed by the color change from yellow ...
Read More ...
Biosynthesis of AgNPs is a new approach in the field of nanotechnology with optimistic implementation in medicine, food control, and pharmacology. In this study, the silver nanoparticles were produced by Lactobacillus gasseri filtrate. The production of AgNPs was confirmed by the color change from yellow to brown. Using UV visible spectrophotometer at 424 nm wavelength, and X-ray diffraction, it was found that the size of the synthesized particles was 58.5 nm after applying Scherrer’s equation. The inhibitory activity of silver nitrate on the growth of some pathogenic isolates was studied Staphylococcus haemolyticus Gram positive, and Klebsiella pneumoniae Gram negative. The highest inhibitory diameter was 14.6 mm at 100% concentration (stock) against Staphylococcus haemolyticus bacteria was followed by that of Klebsiella pneumoniae bacteria with an average inhibition zone diameter reached 13.6 mm at 100% concentration. The highest effect was of AgNPs on the growth of Staphylococcus haemolyticus bacteria, as it found the average diameter of the inhibition zone reached to 29.3 mm, followed by Klebsiella pneumoniae with the average diameter of the inhibiting zone it was 22.6 mm at 100% concentration (stock). This study showed AgNPs have more antibacterial activity against Gram positive bacteria than Gram negative bacteria. The importance of this study lies in testing the effectiveness of by Lactobacillus gasseri bacteria in the biosynthesis of silver nanoparticles and studying their antibacterial activity on pathogenic bacteria.
Biotechnology
Nehia Hussein; Mina M. Khadum
Abstract
In this study 50 isolates were obtained from the Baghdad teaching city medicine laboratories, from wounds and burns. Isolates were identified exercise VITEK 2 system (Biomerieux). Streptococcus pyogenes isolate was used to create the biosynthesize of silver nanoparticles’’ against some pathogenic ...
Read More ...
In this study 50 isolates were obtained from the Baghdad teaching city medicine laboratories, from wounds and burns. Isolates were identified exercise VITEK 2 system (Biomerieux). Streptococcus pyogenes isolate was used to create the biosynthesize of silver nanoparticles’’ against some pathogenic microbes such as Pseudomonas aeruginosa, Staphylococcus aureus, Escherichia coli, and Candida albicans. Evaluation of the effect of the created biosynthesis silver nanoparticles’’ (AgNPs) by Streptococcus pyogenes on the biofilm formation by various human pathogenic bacteria. Biosynthesis of AgNPs was characterized by ultraviolet-visible absorption spectroscopy, the observation of color change of the experimental samples in the presence of 1 mM AgNO3 at 410 nm. A color change from pale yellow to slightly brown occurred for bacterial supernatant within 24 hours of incubation in the presence of light Scanning electron microscope (SEM), the biosynthesis silver nanoparticles’’ are predominately circular fit as a fiddle having a smooth surface and very much scattered with close minimal game plan, X-ray diffraction (XRD). The The normal molecule size was determined by Debye-Scherer equation and its evaluation was roughly 6.43nm. The normal molecule size was determined by Debye-Scherer equation and its evaluation was roughly 6.43nm. The importance of this work lies in the possibility of synthesizing the silver nanoparticles’’ using these bacteria, which are considered as types of fastidious bacteria. As far as the researcher’s knowledge is concerned, this is study is the first of its kind in Iraq.
