Coleus aromaticus leaf extract mediated synthesis of silver nanoparticles and its bactericidal activity

Abstract

The utilization of various plant resources for the biosynthesis of metallic nanoparticles is called green nanotechnology, and it does not utilize any harmful chemical protocols. The present study reports the plantmediated synthesis of silver nanoparticles using the plant leaf extract of Coleus aromaticus, which acts as a reducing and capping agent. The silver nanoparticles were characterized by ultraviolet visible spectroscopy, X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, and the size of the silver nanoparticles is 44 nm. The bactericidal activity of the silver nanoparticles was carried out by disc diffusion method that showed high toxicity against Bacillus subtilis and Klebsiella planticola. Biosynthesis of silver nanoparticles by using plant resources is an eco-friendly, reliable process and suitable for large-scale production. Moreover, it is easy to handle and a rapid process when compared to chemical, physical, and microbe-mediated synthesis process.

Biogenic synthesis of silver nanoparticles using guava (Psidium guajava) leaf extract and its antibacterial activity against Pseudomonas aeruginosa

“…It may be noted that average particle size estimated was 40 nm, and particle size ranges from 10 to 90 nm. The size of these biosynthesized Ag nanoparticles are in conformity with the size of earlier reported biosynthesized Ag nanoparticles using the leaf of Coleus aromaticus, 40-50 nm (Vanaja and Annadurai 2013), using living peanut seedling, 30-100 nm (Raju et al 2014), using leaf extract Petroselinum crispum, 30-32 nm (Roy et al 2014), using Justicia adhatoda L Leaf, 5-50 nm (Bose and Chatterjee 2015), etc.…”

“…Recently, the plant-mediated synthesis of silver nanoparticles using Coleus aromaticus leaf (Vanaja and Annadurai 2013), living peanut seedling (Raju et al 2014), Petroselinum crispum leaf (Roy et al 2014), Citrus limon leaf (Vankar and Shukla 2012), Avicennia marina mangrove plant leaf, bark and root (Gnanadesigan et al 2012) and Justicia adhatoda L. Leaf (Bose and Chatterjee 2015) have been reported.…”

Phytofabrication and characterization of monodisperse copper oxide nanoparticles using Albizia lebbeck leaf extract

“…Microorganisms, plants and enzymes are employed as environmental benign materials for synthesis of biocompatible, non-toxic synthesis of metal nanoparticles (Abboud et al 2014;Tsibakhashvil et al 2010;Augustine et al 2014;Vetchinkina et al2014). Synthesis of metal nanoparticles using plant extracts was found valuable process as compared to microbes due to several advantages like simple process, easily available, safe to handle and easily scaled up (Kouvaris et al 2012;Vanaja and Annadurai 2012). Reduction rate and stabilization of nanoparticles can be increased by the presence of various phytochemicals in plant extract which mediate the nanoparticle synthesis and can act as capping and reducing agents (Rashmi and Preeti 2009).…”

Rapid colorimetric detection of Hg2+ ion by green silver nanoparticles synthesized using Dahlia pinnata leaf extract

“…Green synthesis of silver nanoparticles using various plant extracts has received more attention recently over the use of microorganisms due to its low cost and easy handling methods, unlike the complicated procedure of maintaining cell cultures [15]. Silver nanoparticles were first prepared through the green route by Gardea-Torresdey et al [16].…”