Poly(vinyl pyrrolidone)-mediated synthesis of silver nanowires decorated with silver nanospheres and their antimicrobial activity

Abstract

Pathogenic infectious diseases, like bacterial infections, are one of the most prevalent types of diseases all over the world. Although antibiotics are commonly used and widely available drugs for the treatment of bacterial infections, bacteria show multiple drug resistance, have a tendency to get genetically mutated and become resistant to commonly employed antibiotic drugs. This makes the invention of novel drugs essential. One of the possible approaches is the use of nanomaterials for this purpose. The present study attempts to synthesize silver nanospheres and silver nanowires and compare their antibacterial activity. Silver nanospheres were synthesized by chemical reduction of silver nitrate in the presence of a suitable stabilizer. For the synthesis of silver nanowires, polyol method was employed. Silver nanowires neatly decorated with silver nanospheres were obtained. The antibacterial activity was estimated by separately determining the minimum inhibition concentration of the two nanostructures on Gram-positive bacteria Bacillus subtilis and Gram-negative bacteria Escherichia coli cultured on Luria Bertani agar media. The comparison shows that the antibacterial activity of silver nanospheres is better than that of silver nanowires which is attributed to its higher surface area and the difference in uptake mechanism by the bacterial cells.

Pine Needle (Pinus densiflora) Extract‐Mediated Synthesis of Silver Nanoparticles and the Preparation of Carrageenan‐Based Antimicrobial Packaging Films

“…The crystalline nature of the AgNP was analyzed using XRD analysis (Figure 1(c)). The XRD pattern exhibited diffraction peaks at (111), (200), 4 Journal of Nanomaterials (220), and (311) lattice planes which are characteristics of silver nanoparticles [12], determining the formation of crystalline AgNP. However, the pine needle extract did not show any diffraction peak indicating the amorphous nature of the capping polyphenols.…”

“…The intensity of the 430-480 nm absorption peak increased with the concentration of the AgNP. It was reported that AgNP absorbed radiations at 410-430 nm [11,12,36,40]. Overall, despite being less transparent than Carr films, the nanocomposite films showed decent light transmittance in the visible region of the spectrum.…”

“…Silver nanoparticles (AgNP) have long been used as antimicrobial agents against various pathogenic microorganisms, particularly food-borne bacterial strains [11,12]. Therefore, AgNPs have also been widely used as fillers for antibacterial food packaging nanocomposite films [13,14].…”

“…Therefore, AgNPs have also been widely used as fillers for antibacterial food packaging nanocomposite films [13,14]. AgNPs were synthesized by various methods [11,12]. Chemical synthesis is considered the most efficient synthesis method for metallic nanoparticles.…”

Synthesized uniform-different sizes silver nanoparticles using TSC and SBH simultaneously for antibacterial application

“…Silver nanospheres with sizes ranging from a few nanometers to hundreds of nanometers have been synthesized by different methods [13][14][15][16]. The chemical synthesis uses chemicals to reduce Ag + ions into Ag 0 atoms, while the green synthesis uses organic compounds in plant extracts or bacteria and fungi as reducing agents.…”