Biosynthesis of antibacterial silver nanoparticles using Astragalus verus Olivier

Abstract

In this work, a green method was introduced for preparing silver nanoparticles (Ag NPs) using gum tragacanth extracted from Astragalus verus Olivier. The absence of a chemical reducing agent that may be toxic is an advantage of this method. The Ag NPs were prepared in different tragacanth concentrations, pH values, and temperatures. XRD, FT-IR, and UV-vis spectroscopy analyses confirmed the structure of the synthesised Ag NPs. TEM and FESEM images showed that the prepared Ag NPs have spherical shapes. The FESEM images determined that a pH of 10 and a synthesis temperature of 50°C would be the optimal condition for preparing Ag NPs in this method. The change in concentration of tragacanth does not have much effect on the quality of Ag NPs. Obtained data from DLS revealed that the average diameter of Ag NPs is about 40 nm. The antibacterial activity of the prepared nanoparticles was evaluated against both Gram-positive and Gram-negative bacterial species. The results of the antibacterial tests showed that the prepared Ag NPs possess a desirable antibacterial activity.

Application of Biosynthesized Silver Nanoparticles from Oak Fruit Exudates against Pectobacterium carotovorum subsp. carotovorum Causing Postharvest Soft Rot Disease in Vegetables

“…Biosynthesis of SNPs from plant materials has fascinated scientists in the last decade, being a novel technique with a simple one-step methodology that does not produce hazardous chemicals. As a result, this method is very cost-effective, as well as ecologically benign and leaves minimally hazardous residues in soil and water [44][45][46]. The stronger the bactericidal activity, the bigger the surface area of the bacterial membrane, resulting in smaller SNPs, according to one probable mechanism for silver nanoparticles' antibacterial capabilities.…”

Phytochemicals, Essential Oils Composition and Antioxidant Activity of Astragalus spp., Phlomis olivieri and Daphne mucronata in Habitats of Central Iran

“…[9] A. verus has natural distributions in Armenia, Afghanistan, Turkey, and the mountainous areas of central Iran. [9,10] This species is regarded as one of the most important industrial species in Iran, with medicinal properties. [9,10] Astragalus adscendens is an Iranian endemic species which produces a valuable gum, locally called "Gaz-angabin".…”

“…[9,10] This species is regarded as one of the most important industrial species in Iran, with medicinal properties. [9,10] Astragalus adscendens is an Iranian endemic species which produces a valuable gum, locally called "Gaz-angabin". [11] This gum is used in various industries, particularly because of its anti-diabetic, anti-spas-modic, anti-headache and anti-flatulent effects.…”

“…It is small, spiny, and produces a highly valuable tragacanth gum [9] . A. verus has natural distributions in Armenia, Afghanistan, Turkey, and the mountainous areas of central Iran [9,10] . This species is regarded as one of the most important industrial species in Iran, with medicinal properties [9,10] .…”