Abstract
In recent years, the green synthesis of silver nanoparticles using various plant extracts has attracted great attention. This is because, these methods are simple, inexpensive and, eco-friendly. In this study, it was observed that silver ions were reduced by phlomis leaf extract after 5 min, leading to the formation of crystalline silver nanoparticles. Phlomis species is known as a rich source of flavonoids, phenylpropanoids and other phenolic compounds. The silver nanoparticles produced by the phlomis extract were characterized by different techniques including UV–vis spectrophotometry, X-ray diffraction, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and FT-IR. The SEM and TEM results indicated that AgNPs were predominantly spherical in shape with an average particle size of 25 nm. In addition, the antibacterial activity of biologically synthesized nanopartilcles against Gram-positive (Staphyloccocus aureus and Bacillus cereus) and Gram-negative (Salmonella typhimurium and Escherichia coli) bacteria was proved. This study, therefore, showed that the phlomis leaf extract could be used for the green synthesis of silver nanoparticles with the appropriate antibacterial activity.
Highlights
One of the most important fields of research in nanotechnology is the synthesis of different nanoparticles such as silver, gold, iron, etc. [1,2,3,4]
The silver nanoparticles produced by the phlomis extract were characterized by different techniques including UV–vis spectrophotometry, X-ray diffraction, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and FT-IR
The phlomis plant extract was employed for the green synthesis of AgNPs
Summary
One of the most important fields of research in nanotechnology is the synthesis of different nanoparticles such as silver, gold, iron, etc. [1,2,3,4]. Physical and chemical methods have usually been successful in the synthesis of nanomaterials in large quantities in short periods of time, as well for specific size and shape. Most of these methods are extremely expensive and they involve the use of toxic, hazardous chemicals as the stabilizers which may pose potential environmental and biological risks [5,6,7,8]. Green synthesis methods utilize miscellaneous biological natural substances such as microorganisms, whole plants, plant tissues and fruits, plant extracts, marine algae and micro– fluids for the reduction and stabilization of nanoparticles. Synthesis of nanoparticles using plant extracts has several advantages over other environmentally green synthesis methods, because plants are broadly distributed, readily scalable, available, safe to handle and less expensive [2]
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