Use of Aqueous Extract of Pseuderanthemum acuminatissimum Radlk Leaves To Mediate The Synthesis of Gold Nanoparticles and Their Anti Eschericia coli Activity

Abstract

This research provides a new route to obtain gold nanoparticles (AuNPs) using an aqueous extract of air-dried Pseuderanthemum acuminatissimum Radlk leaves. The extract was used as a reducing agent in the formation of metallic gold from gold ions, and acted as a stabilizer of the obtained AuNPs in the reaction mixture. The formation of AuNPs in aqueous extract of P. acuminatissimum Radlk leaves was validated by change in color and the appearance of surface plasmone resonance (SPR) peak at 552 nm. The average size of the gold nanoparticles was 63 nm, and irregular shapes were observed in the reaction mixture. Fourier transform infrared spectroscopy (FT-IR) reveals the presence of organic compound containing hydroxyl functional groups in the air-dried P. acuminatissimum Radlk leaves, which predicted to be the most responsible for the reduction of gold ions to form metallic gold. The antibacterial properties of the gold nanoparticles were studied using Escherichia coli (ATCC 8739 TM*) strain; the AuNPs significantly inhibited the growth of E. coli indicated by a slight increase in the size of the inhibition zone as the volume of added nanocolloid was increased. Therefore, the present study indicated the promising of green synthesis of AuNPs using biological agents and as a potential material to inhibit the bacterial growth.

Melastoma malabathricum Fruit Extract-Mediated Synthesis of Silver Nanoparticles with Sensing Ability for High Concentrations of Mercury (II) Nitrate

“…The filtrate was retained for further experiments. The synthesis of silver nanoparticles was carried out following our previous result in the synthesis of gold nanoparticles with slight modification [20] by direct addition of 2 mL of silver nitrate (0.01 M) to the M. malabathricum fruits extract (4 mL) in a reaction tube under constant stirring for 1 hour using a magnetic stirrer at room temperature. UV-Visible spectrophotometry (400 nm -800 nm) was used to monitor the progress of the reaction at various intervals.…”

Bio-Synthesis of Gold Nanoparticles Through Bioreduction using the Aqueous Extract of Muntingia Calabura L. LEAF

“…Analysis functional group of aunps FTIR measurements were performed to identify the biomolecule compounds in Muntingia calabura L. leaves which are responsible for the reduction, capping and stabilization of the gold nanoparticle bioreduction 14 . Fig.…”

Eco-friendly Coating of Natural Zeolite with Metallic Gold, and Characterization of the Resulting Products

“…Analysis revealed that spherical gold nanoparticles with an average diameter of 27 nm have a surface plasmon resonance peak at 539 nm. 15 The existing research has stimulated our interest in developing a green method of coating natural zeolite with metallic gold, and characterizing the resulting products. We believe our research will significantly contribute to the development of competitive green substances that are compatible with existing materials.…”