A Green Approach to Synthesize Silver Nanoparticles in Starch-co-Poly(acrylamide) Hydrogels by Tridax procumbens Leaf Extract and Their Antibacterial Activity

Abstract

A series of starch-co-poly(acrylamide) (starch-co-PAAm) hydrogels were synthesized by employing free radical redox polymerization. A novel green approach, Tridax procumbens (TD) leaf extract, was used for reduction of silver ions (Ag+) into silver nanoparticles in the starch-co-PAAm hydrogel network. The formation of silver nanoparticles was confirmed by UV-visible spectroscopy (UV-Vis), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (X-RD) studies. 22% of weight loss difference between hydrogel and silver nanocomposite hydrogel (SNCH) clearly indicates the formation of silver nanoparticles by TGA. TEM images indicate the successful incorporation of silver nanoparticles ranging from 5 to 10 nm in size and spherical in shape with a narrow size distribution. These developed SNCHs were used to study the antibacterial activity by inhibition zone method against gram-positive and gram-negative bacteria such as Bacillus and Escherichia coli. The results indicated that these SNCHs can be used potentially for biomedical applications.

Silver nanoparticle anchored with novel crosslinked beaded polystyrene/polyamidoxime sequential interpenetrating polymer networks (IPNs) and its antibacterial activity

“…The antibacterial activity of SNPs‐IPN beads in terms of zone of inhibition developed against both types of bacteria (gram positive and negative bacteria) can be compared with reported literature and it is found that the diameter of the zone of inhibition against both types of bacteria using the SNPs‐IPN beads was more than some of SNPs comprising polymer composites . This indicates that the prepared SNPs‐IPN beads are promising disinfecting agent for water purification.…”

Lignosulfonic Acid Based Hydrogel Nanocomposites for Antimicrobial Application

“…The other reason may be that the formed nanoparticles have different sizes with different surface charges in the gel networks causing absolute expansion of the networks (Siraj et al, 2013). Increase of crosslinker concentration in the hydrogel synthesis leads to decreased swelling capacities of hydrogels ( Fig 6C).…”

“…Globally, lignin is regarded as an unrefined material with a high recovery potential, easy to get from the renewable sources, with low costs and an insignificant pollution degree (Totolin et al, 2010;Sekhar et al, 2014).…”

“…The ionized silver is highly reactive, as it binds to tissue proteins and brings structural changes in the bacterial cell wall and nuclear membrane leading to cell distortion and death (Alexander et al, 2015). Silver also binds to bacterial DNA and RNA and by denaturing inhibits bacterial replication (Sudana Rao et al, 2013;Chopra 2007).…”

Untitled

“…Some experimental methods for the removal of heavy elements are used with a combination for different techniques such as membrane and electrolysis [3][4][5]. The extraction of heavy metal ions as pollutants from water pollution, using electrochemical methods, is important [6][7][8][9]. Several metal ions in solutions can be recovered by reduction at the cathode.…”