Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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CoO Thin Nanosheets Exhibit Higher Antimicrobial Activity Against Tested Gram-positive Bacteria Than Gram-negative Bacteria

  • Khan, Shams Tabrez (Department Zoology, King Saud University) ;
  • Wahab, Rizwan (Department Zoology, King Saud University) ;
  • Ahmad, Javed (Department Zoology, King Saud University) ;
  • Al-Khedhairy, Abdulaziz A. (Department Zoology, King Saud University) ;
  • Siddiqui, Maqsood A. (Department Zoology, King Saud University) ;
  • Saquib, Quaiser (Department Zoology, King Saud University) ;
  • Ali, Bahy A. (Department Zoology, King Saud University) ;
  • Musarrat, Javed (Department of Agricultural Microbiology, Faculty of Agricultural Sciences, Aligarh Muslim University)
  • Received : 2014.11.16
  • Accepted : 2015.01.27
  • Published : 2015.10.01
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Abstract

Envisaging the role of Co in theranautics and biomedicine it is immensely important to evaluate its antimicrobial activity. Hence in this study CoO thin nanosheets (CoO-TNs) were synthesized using wet chemical solution method at a very low refluxing temperature ($90^{\circ}C$) and short time (60 min). Scanning electron microscopy of the grown structure revealed microflowers ($2{\sim}3{\mu}m$) composed of thin sheets petals (60~80 nm). The thickness of each individual grown sheet varies from 10~20 nm. Antimicrobial activities of CoO-TNs against two Gram positive bacteria (Micrococcus luteus, and Staphylococcus aureus), and two Gram negative bacteria (Escherichia coli and Pseudomonas aeruginosa) were determined. A 98% and 65% growth inhibition of M. luteus and S. aureus respectively, was observed with $500{\mu}g/ml$ of CoO-TNs compared to 39 and 34% growth inhibition of E. coli and P. aeruginosa, respectively with the same concentration of CoO-TNs. Hence, synthesized CoO-TNs exhibited antimicrobial activity against Gram negative bacteria and an invariably higher activity against tested Gram positive bacteria. Therefore, synthesized CoO-TNs are less prone to microbial infections.

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