Search

Metallic nanoparticles are important substances in medicine. These particles could be prepared by various ways including green synthesis. The production of silver nanoparticles by plant extracts is widely used because of their environmentally friendly properties. In this study, silver nanoparticles have been synthesized by biological method and Apricot tree (Prunus armeniaca) leaf extract was used as reducing agent. The color change and formation of the characteristic absorption peak at 400-500 nm were the first indications of AgNP formation. XRD analysis showed the crystalline particles and obtained AgNPs were generally in spherical shape with the average particle size of 24 nm. Their antimicrobial activity studies against various pathogenic microorganisms showed that they have strong antibacterial activity against Escherichia coli and Staphylococcus aureus and antifungal activity against Candida albicans. The minimum inhibitory concentrations for E. coli, S. aureus and C. albicans were 0.125, 0.125 and 0.250 μg/mL, respectively. The results confirmed that Prunus armeniaca leaf extract could be used to produce AgNPs with efficient antimicrobial activity. [ABSTRACT FROM AUTHOR]

Green synthesis is a biological method known for being environment-friendly, cheap and for retrieval of nanoparticles with ease, which is preferred more than chemical and physical methods. Various metallic nanoparticles with potent bioactivities have been synthesized using plant extracts. In this study, synthesis of silver nanoparticles (AgNPs) using the aqueous leaf extract of Euphorbia rigida was investigated. Their antibacterial activity was determined using microdilution methods. The optimization of the synthesis was performed via the adjustment of different parameters including pH, temperature, concentration of the plant extract, the different concentrations of AgNO3, and synthesis time using UVvisible spectroscopy. Silver nanoparticles (Er-AgNPs) that were synthesized by Euphorbia rigida characterized by Dynamic Light Scattering (DLS) and Scanning Electron Microscope (SEM) analyses and their antimicrobial potential were tested on six different pathogens. The synthesis process resulted in spherical-shaped NPs with a size ranging between 50-75nm. The AgNPs demonstrated a strong antimicrobial activity against various pathogens (Escherichia coli, Staphylococcus aureus, Enterococcus faecium, Staphylococcus epidermidis, Salmonella enteritidis, Salmonella typhimurium, Listeria monocytogenes and Candida albicans). The results showed that the synthesized Er-AgNPs can be used as a biological material for biomedical, pharmaceutical, biotechnology and industrial areas. In this study, the antimicrobial potential of silver nanoparticles which are prepared using Euphorbia rigida leaf extract is reported for the first time. [ABSTRACT FROM AUTHOR]

The aim of this study is to synthesize silver nanoparticles via green synthesis using water extracts of some herbal drugs which can be obtained easily and inexpensively. In this study, water extracts of some medicinal plant drugs, which are also used as spice, such as lavender flowers, fennelflower seeds, black pepper seeds, pine leaves, clove flowers, rosemary leaves, thyme leaves, sage leaves, laurel leaves, alkanna roots and green tea leaves were utilized as a reducing agent in the synthesis of silver nanoparticles. The extracts were mixed with 1 mM silver nitrate solution and their color changes and intensities were examined. Silver nanoparticle formations were also confirmed by UV-Vis spectrophotometric analysis. Alterations in pH values were also recorded. According to the results, all the plant extracts can be used as a bioreducing agent for the synthesis of silver nanoparticles and they all exhibited different characteristics, which will be beneficial for different applications in nanotechnology. [ABSTRACT FROM AUTHOR]