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Co-Binding of Pharmaceutical Compounds at Mineral Surfaces: Molecular Investigations of Dimer Formation at Goethite/Water Interfaces
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2017 (English)In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 51, no 15, p. 8343-8349Article in journal (Refereed) Published
Abstract [en]

The emergence of antibiotic and anti-inflammatory agents in aquatic and terrestrial systems is becoming a serious threat to human and animal health worldwide. Because pharmaceutical compounds rarely exist individually in nature, interactions between various compounds can have unforeseen effects on their binding to mineral surfaces. This work demonstrates this important possibility for the case of two typical antibiotic and anti-inflammatory agents (nalidixic acid (NA) and niflumic acid (NFA)) bound at goethite (alpha FeOOH) used as a model mineral surface. Our multidisciplinary study, which makes use of batch sorption experiments, vibration spectroscopy and periodic density functional theory calculations, reveals enhanced binding of the otherwise weakly bound NFA caused by unforeseen intermolecular interactions with mineral-bound NA. This enhancement is ascribed to the formation of a NFA NA dimer whose energetically favored formation (-0.5 eV compared to free molecules) is predominantly driven by van der Waals interactions. A parallel set of efforts also showed that no. cobinding occurred with sulfamethoxazole (SMX) because of the lack of molecular interactions with coexisting contaminants. As such, this article raises the importance of recognizing drug cobinding, and lack of cobinding, for predicting and developing policies on the fate of complex mixtures of antibiotics and anti-inflammatory agents in nature.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2017. Vol. 51, no 15, p. 8343-8349
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Other Basic Medicine Other Chemistry Topics
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URN: urn:nbn:se:umu:diva-138593DOI: 10.1021/acs.est.7b02835ISI: 000406982600015OAI: oai:DiVA.org:umu-138593DiVA, id: diva2:1143453
Available from: 2017-09-21 Created: 2017-09-21 Last updated: 2018-06-09Bibliographically approved

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Boily, Jean-Francois

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CiteExportLink to record
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  • apa
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  • de-DE
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  • nn-NO
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