Preparation of Silver/Chitosan Nanofluids Using Selected Plant Extracts: Characterization and Antimicrobial Studies against Gram-Positive and Gram-Negative Bacteria

Umoren, Saviour A. and Solomon, Moses M. and Nzila, Alexis and Obot, Ime B. (2020) Preparation of Silver/Chitosan Nanofluids Using Selected Plant Extracts: Characterization and Antimicrobial Studies against Gram-Positive and Gram-Negative Bacteria. MATERIALS, 13. ISSN 1392–1320

PDF Download (5MB)

Abstract

Chitosan/silver nanofluids were prepared using Phoenix dactylifera (DPLE) or Rumex vesicarius (HEL) extracts as the reducing agent, characterized using Fourier-transform infrared spectroscopy (FTIR), ultraviolet–visible (UV-vis), X-ray di�raction (XRD), and transmission electron microscope (TEM). The antimicrobial e�ect of the nanofluids against Gram positive, Bacillus licheniformis, Staphylococcus haemolyticus, Bacillus cereus, and Micrococcus luteus, and Gram-negative Pseudomonas aeruginosa, Pseudomonas citronellolis, and Escherichia coli bacteria has been studied. The nanoparticles were polydispersed in the chitosan matrix and are highly stable. The zeta potential of the silver nanoparticles in DPLE- and HEL-mediated composites is +46 mV and +56 mV, respectively. The FTIR results reveal that the free carboxylate groups in the plant biomaterial took part in stabilization process. HEL is a stronger reducing agent than DPLE and nanoparticles generated with HEL are smaller (8.0–36 nm) than those produced with DPLE (10–43 nm). DPLE- and HEL-mediated composites e�ectively inhibit the growth of the studied bacteria but HEL-mediated composite exhibited higher e�ect. The higher antimicrobial activity of HEL-mediated composite is linked to the smaller nanoparticles. The foregoing results indicate that HEL extract can be used in the green production of potential antimicrobial chitosan/silver nanofluids for biomedical and packaging applications.

Item Type:	Article
Uncontrolled Keywords:	Phoenix dactylifera; Rumex vesicarius; nanofluid; chitosan; silver nanoparticles; antimicrobial e�ect
Subjects:	Q Science > QD Chemistry
Divisions:	Faculty of Engineering, Science and Mathematics > School of Chemistry
Depositing User:	nwokealisi
Date Deposited:	14 Apr 2023 13:34
Last Modified:	14 Apr 2023 13:34
URI:	http://eprints.covenantuniversity.edu.ng/id/eprint/16807

Actions (login required)

View Item