Heavy metal and antibiotic resistance of Acinetobacter spp. isolated from diesel fuel polluted soil

  • Kais Kassim Ghaima Institute of Genetic Engineering and Biotechnology for Postgraduate Studies, University of Baghdad, Baghdad, Iraq. http://orcid.org/0000-0001-7849-0191
  • Noor Saad Lateef Institute of Genetic Engineering and Biotechnology for Postgraduate Studies, University of Baghdad, Baghdad, Iraq.
  • Zainab Thamer Khaz'al Institute of Genetic Engineering and Biotechnology for Postgraduate Studies, University of Baghdad, Baghdad, Iraq.
Keywords: Acinetobacter, Soil, Multiple metal/Antibiotics resistance

Abstract

Heavy metals pollution of soil and wastewater is a global problem that threatens the environment as they are not degraded or removed and the potential threat to human health comes from the multiple resistances to heavy metals and antibiotics among bacterial populations. The present study was aimed to isolate and identify multiple metal/antibiotic resistant Acinetobacter spp. from diesel fuel polluted soil of Al-Dora, Baghdad, Iraq. Initially, a total of 24 bacterial cultures (coded KNZ–1 to KNZ–24) were isolated and identified up to genus level as Acinetobacter by morphological, physiological and biochemical characteristics. Screening of heavy metals resistant Acinetobacter were conducted by streaking the isolates on nutrient agar plates supplemented with different concentrations: 10, 25, 50 and 100mg/L of the three heavy metals; Hg2+, Cd2+ and Pb2+. Out of 24 isolates, 6 (25%) isolates (KNZ–3, KNZ–5, KNZ–8, KNZ–12, KNZ–16 and KNZ–21) were selected as a multiple heavy metal resistant (MHMR) Acinetobacter with maximum tolerable concentrations (MTCs); 100–200mg/L for Hg2+, 300-600mg/L for Cd2+ and 100–300mg/L for Pb2+. Antibiotic resistance pattern of the selected MHMR isolates was determined by Kirby-Bauer disc diffusion method against 12 different antibiotics belonging to 7 classes. Out of 6 isolates, 4 isolates were multidrug resistance (MDR) with varying degrees. Among them isolate, KNZ–16 showed a wide range of resistance to all tested antibiotics except Levofloxacin and Imipenem. It was concluded that dual resistant Acinetobacter is useful in the bioremediation of environments polluted with heavy metals especially the biodegradation of organic pollutants.

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Published
2018-04-01
How to Cite
Ghaima, K., Lateef, N., & Khaz’al, Z. (2018). Heavy metal and antibiotic resistance of Acinetobacter spp. isolated from diesel fuel polluted soil. Journal of Advanced Laboratory Research in Biology, 9(2), 58-64. Retrieved from https://e-journal.sospublication.co.in/index.php/jalrb/article/view/33
Section
Articles
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