Biodegradation of diesel fuel by a microbial consortium in the presence of 1-alkoxymethyl-2-methyl-5-hydroxypyridinium chloride homologues |
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Authors: | ?ukasz Chrzanowski Monika Stasiewicz Miko?aj Owsianiak Alicja Szulc Agnieszka Piotrowska-Cyplik Agnieszka K Olejnik-Schmidt Bogdan Wyrwas |
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Institution: | ?ukasz Chrzanowski, Monika Stasiewicz, Miko?aj Owsianiak, Alicja Szulc, Agnieszka Piotrowska-Cyplik, Agnieszka K. Olejnik-Schmidt and Bogdan Wyrwas |
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Abstract: | Fast development of ionic liquids as gaining more and more attention valuable chemicals will undoubtedly lead to environmental
pollution. New formulations and application of ionic liquids may result in contamination in the presence of hydrophobic compounds,
such as petroleum mixtures. We hypothesize that in the presence of diesel fuel low-water-soluble ionic liquids may become
more toxic to hydrocarbon-degrading microorganisms. In this study the influence of 1-alkoxymethyl-2-methyl-5-hydroxypyridinium
chloride homologues (side-chain length from C3 to C18) on biodegradation of diesel fuel by a bacterial consortium was investigated. Whereas test performed for the consortium cultivated
on disodium succinate showed that toxicity of the investigated ionic liquids decreased with increase in side-chain length,
only higher homologues (C8–C18) caused a decrease in diesel fuel biodegradation. As a result of exposure to toxic compounds also modification in cell surface
hydrophobicity was observed (MATH). Disulphine blue active substances method was employed to determine partitioning index
of ionic liquids between water and diesel fuel phase, which varied from 1.1 to 51% for C3 and C18 homologues, respectively. We conclude that in the presence of hydrocarbons acting as a solvent, the increased bioavailability
of hydrophobic homologues is responsible for the decrease in biodegradation efficiency of diesel fuel. |
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Keywords: | Biodegradation DBAS Diesel fuel Hydrocarbons Microbial consortium Ionic liquids Toxicity |
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