title: Antimicrobial dependence of silver nanoparticles on surface plasmon resonance bands againstEscherichia coli.
abstract: This study presents a simple and trouble-free method for determining the antimicrobial properties of silver nanoparticles (AgNPs) based on the surface plasmon resonance (SPR) bands. AgNPs were prepared by chemical reduction method using silver nitrates as a metallic precursor and formaldehyde (HCHO) as a reducing agent and capped by polyethylene glycol. Effects of several processing variables on the size and shape of AgNPs were monitored using an ultraviolet-visible spectrophotometer based on their SPR bands. The formed particles showing various particle shapes and full width at half maximum (FWHM) were tested againstEscherichia coliby surface spreading using agar plates containing equal amounts of selected AgNPs samples. The NPs exhibited higher antimicrobial properties; however, monodispersed spherical NPs with narrow FWHM were more effective againstE. coligrowth. The NPs prepared are promising candidates in diverse applications such as antimicrobial agents in the food and biomedical industries.
authors.affiliation: School of Life Sciences and Bioengineering, Nelson Mandela African Institution of Science and Technology, Arusha, Tanzania; ICAR-Central Institute of Post-Harvest Engineering and Technology (ICAR-CIPHET), Ludhiana, Punjab, India.
authors.forename: Nichrous G
authors.initials: NG
authors.lastname: Mlalila
authors.affiliation: School of Life Sciences and Bioengineering, Nelson Mandela African Institution of Science and Technology, Arusha, Tanzania.
authors.forename: Hulda Shaidi
authors.initials: HS
authors.lastname: Swai
authors.affiliation: Department of Materials Science and Engineering, Nelson Mandela African Institution of Science and Technology, Arusha, Tanzania.
authors.forename: Askwar
authors.initials: A
authors.lastname: Hilonga
authors.affiliation: ICAR-Central Institute of Post-Harvest Engineering and Technology (ICAR-CIPHET), Ludhiana, Punjab, India.
authors.forename: Dattatreya M
authors.initials: DM
authors.lastname: Kadam
keywords: antimicrobial agent; bandwidth; full width at half maximum; nanoparticles; particle size