Antibacterial Activity of Silver Nanoparticles Capped by <i>p</i>-Aminobenzoic Acid on <i>Escherichia coli</i> and <i>Staphylococcus aureus</i>

Abstract

This paper describes the antibacterial performance of silver nanoparticles (AgNPs) which have been synthesized by using p-aminobenzoic acid as reducing and stabilizing agent simultaneously. The silver nitrate with various concentrations was reacted with pH 11-adjusted p-aminobenzoic acid with a concentration of 5 × 10–3 mol L–1 for 30 min in a boiling water bath. The synthesized AgNPs were characterized by UV-Vis spectrophotometry, Transmission Electron Microscope (TEM), and Particle Size Analyzer (PSA). The antibacterial performance of the synthesized AgNPs was evaluated by agar well diffusion method on Escherichia coli and Staphylococcus aureus. The higher silver nitrate concentration, the bigger the nanoparticle size, the wider particle size distribution, and the higher number of AgNPs formed. AgNPs synthesized from higher silver nitrate concentration had higher antibacterial activity. It is an indication that the antibacterial activity of AgNPs is mainly controlled by the silver ion concentration which influences the AgNPs particle size and existence of silver ion in the AgNPs colloidal solution

A Green Method for Synthesis of Silver-Nanoparticles-Diatomite (AgNPs-D) Composite from Pineapple (<i>Ananas comosus</i>) Leaf Extract

“…One of the elements that possessed excellent antibacterial properties is silver nanoparticles (AgNPs). The substances are not toxic to humans but have high toxicity to microorganisms such as bacteria, viruses, and fungi [17][18][19]. The resulting silver nanoparticles (AgNPs) will be loaded into the diatomite (D) pores to obtain silver-nanoparticle diatomite (AgNPs-D) composite material.…”

Antifungal Activity of TiO₂/Ag Nanoparticles under Visible Light Irradiation

“…Fig. 4(b), 4(c), and 4(d) show the presence of dark layers in the form of small spheres on the surface of TiO2 which was likely Ag [11,[16][17][18][19]. These images also show that the Ag loaded on the surface of TiO2 were already in nanoparticle size.…”

Synthesis, Characterization and Antibacterial Properties of Nickel(II) Complex with 4-Aminoantipyrine Ligand

“…The diameter of AAP and Ni(NO3)2•6H2O inhibition zones against E. coli bacteria was smaller than that of S. aureus. This was due to differences in their membrane composition, in which E. coli has a more complex cell membrane structure [28][29]. However, this was not the case for the complex, which has a smaller inhibition zone difference between both bacteria.…”