Cargando…
Adsorption of hydroxamate siderophores and EDTA on goethite in the presence of the surfactant sodium dodecyl sulfate
Siderophore-promoted iron acquisition by microorganisms usually occurs in the presence of other organic molecules, including biosurfactants. We have investigated the influence of the anionic surfactant sodium dodecyl sulfate (SDS) on the adsorption of the siderophores DFOB (cationic) and DFOD (neutr...
Autores principales: | , , , |
---|---|
Formato: | Texto |
Lenguaje: | English |
Publicado: |
BioMed Central
2009
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2706842/ https://www.ncbi.nlm.nih.gov/pubmed/19523232 http://dx.doi.org/10.1186/1467-4866-10-5 |
_version_ | 1782169099520966656 |
---|---|
author | Carrasco, Naraya Kretzschmar, Ruben Xu, Jide Kraemer, Stephan M |
author_facet | Carrasco, Naraya Kretzschmar, Ruben Xu, Jide Kraemer, Stephan M |
author_sort | Carrasco, Naraya |
collection | PubMed |
description | Siderophore-promoted iron acquisition by microorganisms usually occurs in the presence of other organic molecules, including biosurfactants. We have investigated the influence of the anionic surfactant sodium dodecyl sulfate (SDS) on the adsorption of the siderophores DFOB (cationic) and DFOD (neutral) and the ligand EDTA (anionic) onto goethite (α-FeOOH) at pH 6. We also studied the adsorption of the corresponding 1:1 Fe(III)-ligand complexes, which are products of the dissolution process. Adsorption of the two free siderophores increased in a similar fashion with increasing SDS concentration, despite their difference in molecule charge. In contrast, SDS had little effect on the adsorption of EDTA. Adsorption of the Fe-DFOB and Fe-DFOD complexes also increased with increasing SDS concentrations, while adsorption of Fe-EDTA decreased. Our results suggest that hydrophobic interactions between adsorbed surfactants and siderophores are more important than electrostatic interactions. However, for strongly hydrophilic molecules, such as EDTA and its iron complex, the influence of SDS on their adsorption seems to depend on their tendency to form inner-sphere or outer-sphere surface complexes. Our results demonstrate that surfactants have a strong influence on the adsorption of siderophores to Fe oxides, which has important implications for siderophore-promoted dissolution of iron oxides and biological iron acquisition. |
format | Text |
id | pubmed-2706842 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2009 |
publisher | BioMed Central |
record_format | MEDLINE/PubMed |
spelling | pubmed-27068422009-07-08 Adsorption of hydroxamate siderophores and EDTA on goethite in the presence of the surfactant sodium dodecyl sulfate Carrasco, Naraya Kretzschmar, Ruben Xu, Jide Kraemer, Stephan M Geochem Trans Research Article Siderophore-promoted iron acquisition by microorganisms usually occurs in the presence of other organic molecules, including biosurfactants. We have investigated the influence of the anionic surfactant sodium dodecyl sulfate (SDS) on the adsorption of the siderophores DFOB (cationic) and DFOD (neutral) and the ligand EDTA (anionic) onto goethite (α-FeOOH) at pH 6. We also studied the adsorption of the corresponding 1:1 Fe(III)-ligand complexes, which are products of the dissolution process. Adsorption of the two free siderophores increased in a similar fashion with increasing SDS concentration, despite their difference in molecule charge. In contrast, SDS had little effect on the adsorption of EDTA. Adsorption of the Fe-DFOB and Fe-DFOD complexes also increased with increasing SDS concentrations, while adsorption of Fe-EDTA decreased. Our results suggest that hydrophobic interactions between adsorbed surfactants and siderophores are more important than electrostatic interactions. However, for strongly hydrophilic molecules, such as EDTA and its iron complex, the influence of SDS on their adsorption seems to depend on their tendency to form inner-sphere or outer-sphere surface complexes. Our results demonstrate that surfactants have a strong influence on the adsorption of siderophores to Fe oxides, which has important implications for siderophore-promoted dissolution of iron oxides and biological iron acquisition. BioMed Central 2009-06-13 /pmc/articles/PMC2706842/ /pubmed/19523232 http://dx.doi.org/10.1186/1467-4866-10-5 Text en Copyright ©2009 Carrasco et al; licensee BioMed Central Ltd. http://creativecommons.org/licenses/by/2.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Research Article Carrasco, Naraya Kretzschmar, Ruben Xu, Jide Kraemer, Stephan M Adsorption of hydroxamate siderophores and EDTA on goethite in the presence of the surfactant sodium dodecyl sulfate |
title | Adsorption of hydroxamate siderophores and EDTA on goethite in the presence of the surfactant sodium dodecyl sulfate |
title_full | Adsorption of hydroxamate siderophores and EDTA on goethite in the presence of the surfactant sodium dodecyl sulfate |
title_fullStr | Adsorption of hydroxamate siderophores and EDTA on goethite in the presence of the surfactant sodium dodecyl sulfate |
title_full_unstemmed | Adsorption of hydroxamate siderophores and EDTA on goethite in the presence of the surfactant sodium dodecyl sulfate |
title_short | Adsorption of hydroxamate siderophores and EDTA on goethite in the presence of the surfactant sodium dodecyl sulfate |
title_sort | adsorption of hydroxamate siderophores and edta on goethite in the presence of the surfactant sodium dodecyl sulfate |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2706842/ https://www.ncbi.nlm.nih.gov/pubmed/19523232 http://dx.doi.org/10.1186/1467-4866-10-5 |
work_keys_str_mv | AT carrasconaraya adsorptionofhydroxamatesiderophoresandedtaongoethiteinthepresenceofthesurfactantsodiumdodecylsulfate AT kretzschmarruben adsorptionofhydroxamatesiderophoresandedtaongoethiteinthepresenceofthesurfactantsodiumdodecylsulfate AT xujide adsorptionofhydroxamatesiderophoresandedtaongoethiteinthepresenceofthesurfactantsodiumdodecylsulfate AT kraemerstephanm adsorptionofhydroxamatesiderophoresandedtaongoethiteinthepresenceofthesurfactantsodiumdodecylsulfate |