Effect of Chromium and Organic Acids on Microbial Growth and Exopolymeric Substance Production by Pseudomonas Bacteria

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dc.authoridDOGAN, GOKSEL/0000-0002-4583-3140
dc.authoridKantar, Cetin/0000-0001-9747-9115
dc.contributor.authorDogan, Nazime Mercan
dc.contributor.authorKantar, Cetin
dc.contributor.authorDogan, Goksel
dc.date.accessioned2025-01-27T20:29:31Z
dc.date.available2025-01-27T20:29:31Z
dc.date.issued2014
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractNatural organic acids are capable of stimulating microbial chromium(VI) reduction, but little information is available about their behavior on microbial growth, exopolymeric substance (EPS) production, and subsequent microbial Cr(VI) reduction. Here, laboratory batch experiments were conducted to determine the effects of different natural organic acids (galacturonic, glucuronic, citric, and alginic acid) on microbial EPS production and the growth rates of four different naturally occurring soil bacteria (Pseudomonas putida P18, P. aeruginosa P16, P. fluorescens ATCC 55241, and P. stutzeri P40) as a function of pH and time in solutions containing toxic metal ions such as Cr(III) and Cr(VI). While the addition of Cr(VI) led to a negative impact on microbial growth in all strains studied, Cr(VI) significantly enhanced EPS release from cells due to extreme cell lysis. Organic acids diminished the toxic effects of Cr(VI) on cells, and thus significantly increased microbial cell growth and the EPS yield. The addition of Cr(III) with Cr(VI), on the other hand, led to a significant decrease in microbial cell growth rates relative to the systems containing only Cr(VI). This toxic effect decreased significantly in the presence of organic acids, and thus the EPS yield increased due to the formation of less toxic Cr(III)-EPS species. The overall results indicate that while the accumulation of free Cr(III) ion in aqueous phase during microbial Cr(VI) reduction may have an adverse influence on microbial cell growth, the EPS released by bacteria may bind with free Cr(III) ion in solution, and thus increase the cell growth rate due to the removal of toxic products of microbial reduction.
dc.description.sponsorshipScientific and Technical Research Council of Turkey [105Y272]
dc.description.sponsorshipThis research was supported by Grant 105Y272 from the Scientific and Technical Research Council of Turkey.
dc.identifier.doi10.1002/clen.201300158
dc.identifier.endpage681
dc.identifier.issn1863-0650
dc.identifier.issn1863-0669
dc.identifier.issue5
dc.identifier.scopus2-s2.0-84899050171
dc.identifier.scopusqualityQ3
dc.identifier.startpage674
dc.identifier.urihttps://doi.org/10.1002/clen.201300158
dc.identifier.urihttps://hdl.handle.net/20.500.12428/22971
dc.identifier.volume42
dc.identifier.wosWOS:000337514900018
dc.identifier.wosqualityQ2
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherWiley-Blackwell
dc.relation.ispartofClean-Soil Air Water
dc.relation.publicationcategoryinfo:eu-repo/semantics/openAccess
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_WoS_20250125
dc.subjectCell growth
dc.subjectHeavy metal toxicity
dc.subjectOrgano-Cr(III) complex
dc.subjectSoil bacteria
dc.titleEffect of Chromium and Organic Acids on Microbial Growth and Exopolymeric Substance Production by Pseudomonas Bacteria
dc.typeArticle

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