Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Antimicrobial activity

Study the Toxicity of Treated Multi Walled Carbon Anotubes (Mwcnts) on Escherichia Coli Bacteria and their Characterization

Adawiya J. Haider; Ali A. Tahaa; Thorria R. Marzoog

Engineering and Technology Journal, 2014, Volume 32, Issue 2, Pages 370-378

In this study, we investigate the antimicrobial activity of treated Multi Walled Carbon Nanotubes (MWNTs) by oil toward gram negative bacteria Escherichia coli(E.coli) and treated MWNTs is performed according to a chemical procedure introducing -COOH groups on their surface . Structural and morphological characterizations of samples have been carried out using SEM and FT-IR spectroscopy. In addition, the SEM images prove the antimicrobial activities of treated MWNTs to bacterial cells by adhesion activity of E.coli on MWNTs surface. Since the functionalization of Multi Walled Carbon Nanotubes (MWCNT-COOH) can be used as effective antimicrobial materials and indicate that severe cell membrane damage by direct contact with MWNTs is the likely mechanism responsible for the toxicity to the model bacteria.

Antimicrobial Activity of Silver Nanoparticles Synthesized by Myrtus Communis Extract

Ghassan M. Sulaiman; Hamssa E. Abd-ul-Wahed; Afnan Ismail Abd-ul-Wahab; Abbas Abdullah Mohammad

Engineering and Technology Journal, 2013, Volume 31, Issue 3, Pages 400-409

In this work, antimicrobial potential of silver nanoparticles synthesized from extract of Myrtus communis on different pathogenic bacteria and yeast was investigated. 10 mL of extract was mixed with 90 mL of 2 mM aqueous AgNO3 and heated at 70 °C for 3 min. A change from greenish to dark brown color was observed. Characterization using UV-VIS spectrophotometery and X- ray diffraction analysis were performed. The UV-Vis spectral analysis showed silver surface plasmon resonance band at 425 nm. X- ray diffraction showed that the particles were crystalline in nature with face centered cubic structure (FCC) of the bulk silver with broad beaks at 38.50° and 44.76°. Antimicrobial activity against six microorganisms was tested using well diffusion method. The synthesized silver nanoparticles efficiently inhibited various pathogenic organisms in a dose-dependent manner was more pronounced against Gram-positive bacteria than Gram-negative bacteria. The approach of green synthesis seems to be cost effective, eco-friendly and easy alternative to conventional methods of silver nanoparticles synthesis. The powerful bioactivity demonstrated by the synthesized silver nanoparticles leads towards the clinical use as antimicrobial.