Abstract
Biodegradation of endosulfan (α and β) and pendimethalin by Bacillus safensis strain FO-36bT, Bacillus subtilis subsp. inaquosorum strain KCTC 13429T and Bacillus cereus strain ATCC14579T isolated from pesticides-polluted soil was studied in mineral salt medium. Endosulfan and pendimethalin were incubated with the three bacterial strains with samples drawn at various intervals for GC analysis. Representative samples were subject to GC–MS analysis. The loss in the initial concentrations, 0.663 mM (α endosulfan), 0.319 mM (β endosulfan) and 1.423 mM (pendimethalin), was monitored and used to compute the half-lives following biphasic model. Removal percentage of endosulfan and pendimethalin in the media inoculated with the bacterial strains ranged from 24 to 95% (α endosulfan), 21–91% (β endosulfan) and 51–97% (pendimethalin), respectively. Despite the significant decrease in starting material in B. safensis cultures, no metabolites were detected, whereas two major metabolites of endosulfan, 1,2,3,4,7,7-hexachloro-5,6-dihydroxybicyclo{2.2.1}-2-heptene and 1,2,3,4,7,7-hexachloro-formaldehyde-6-methylbicyclo{2.2.1}-2-heptene, were detected in the B. subtilis cultures, and one metabolite of pendimethalin metabolite; N-(1-ethylpropyl)-3-methyl-2, 6-diaminobenzine, was detected in the B. cereus culture. Generally, the result indicates the potential capability of these microorganisms in complete mineralization of endosulfan and pendimethalin. Based on half-lives, the efficiency of bacterial strains can be ordered as follows: B. subtilis > B. cereus > B. safensis for endosulfan and B. cereus > B. safensis > B. subtilis for pendimethalin.
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The authors would like to thank Mr. Adam Ali Mohamed and Mr. Salah of the National Chemical Laboratories, Federal Ministry of Health, Sudan, for their help with GC–MS analysis. The financial support made available by the Ministry of Higher Education and Scientific Research, Sudan, is highly acknowledged. The Korean Macrogen Company and Kangwon National University (KNU) were greatly acknowledged for their help with the identification of bacterial isolates by Molecular Biotechnology tools.
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Ishag, A.E.S.A., Abdelbagi, A.O., Hammad, A.M.A. et al. Biodegradation of endosulfan and pendimethalin by three strains of bacteria isolated from pesticides-polluted soils in the Sudan. Appl Biol Chem 60, 287–297 (2017). https://doi.org/10.1007/s13765-017-0281-0
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DOI: https://doi.org/10.1007/s13765-017-0281-0