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A bead suspension array for measuring emerging pollutants and anthropogenic markers in wastewater

  • Background: The assessment of water quality demands for high-throughput and multi-target compatible analytical methods. On the one hand, the influence of sewage on natural surface waters must be routinely monitored - according to the European Water Framework Directive. On the other hand, estimation of removal efficiencies of pollutants, such as drug residues, is in the focus of industrial and public wastewater treatment. Immunoassays, such as ELISA, are often applied in this area owing to their cost-efficiency and high-throughput capability. However, it is only possible to measure a single analyte in one measurement. In contrast, array technology is capable for measuring multiple substances in parallel. Here we present a four-plex bead-based flow cytometric assay for measuring three drugs (carbamazepine, an anti-epileptic drug, diclofenac, an antiphlogistic and caffeine, a psychoactive substance) and the bile acid isolithocholic acid, which is proposed to be used as a fecal marker. TheBackground: The assessment of water quality demands for high-throughput and multi-target compatible analytical methods. On the one hand, the influence of sewage on natural surface waters must be routinely monitored - according to the European Water Framework Directive. On the other hand, estimation of removal efficiencies of pollutants, such as drug residues, is in the focus of industrial and public wastewater treatment. Immunoassays, such as ELISA, are often applied in this area owing to their cost-efficiency and high-throughput capability. However, it is only possible to measure a single analyte in one measurement. In contrast, array technology is capable for measuring multiple substances in parallel. Here we present a four-plex bead-based flow cytometric assay for measuring three drugs (carbamazepine, an anti-epileptic drug, diclofenac, an antiphlogistic and caffeine, a psychoactive substance) and the bile acid isolithocholic acid, which is proposed to be used as a fecal marker. The drugs can be detected from 1 to 4 µg/L and the bile acid can be detected up to 72 µg/L in wastewater, requiring a highly sensitive detection method. Methods: We use core-shell particles as the spherical platform, consisting of a polystyrene core and a silica shell. Such beads can easily be encoded with an organic fluorophore in the core and functionalized with amino groups on the silica shell surface for creating binding sites for antibodies: Therefore, the marker substances are bound to the amino groups via NHS chemistry. The hybrid particles were synthesized in house. Polystyrene was chosen as core material because of its low density and high refractive index, both important requirements for the use in suspension arrays. Easy surface modifications using silane chemistry are accessible on the silica shell. For the determination of the pollutants, the beads are incubated with a mixture of the analyte-specific antibodies. The antibodies undergo a competitive reaction to bind the immobilized molecules on the surface of the beads or the free analyte in the solution, respectively. Bound antibodies can then be visualized via fluorophore-labelled secondary antibodies. For read-out a flow cytometer is used to virtually separate the different dye encoded beads and to measure the resulting Signal intensity of the immunoassay. A four-parametric function was used as calibration curve. Results: In order to obtain highly selective binding of the antibodies, we investigated different types of silica shell surface modifications to overcome unspecific binding, finding that a PEG-modified surface is suitable to support our immunoassay format. Multiplexed small molecule detection can therefore be realized in a simple mix and read procedure without washing steps. Conclusion: We presented a multiplexing suspension array for the detection of four marker substances in wastewater samples, based on an indirect immunoassay format with polystyrene core-silica shell microbeads. The resulting multiplexing assay is appropriate to detect the marker substances in the low µg/L range. Therefore, wastewater samples can be measured without further preconcentration.zeige mehrzeige weniger

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Metadaten
Autor*innen:Peter Carl
Koautor*innen:Dominik Sarma, Knut Rurack, Rudolf Schneider
Dokumenttyp:Posterpräsentation
Veröffentlichungsform:Präsentation
Sprache:Englisch
Jahr der Erstveröffentlichung:2016
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Sanitär- und Kommunaltechnik; Umwelttechnik
Freie Schlagwörter:Anthropogenic markers; Bead-based assay; Immunoassay; Small-molecule sensors; Wastewater
Veranstaltung:Innovations Forum Senftenberg 2016 - Enabling Technologies for Multiparameter Analytics
Veranstaltungsort:Senftenberg, Germany
Beginndatum der Veranstaltung:01.06.2017
Enddatum der Veranstaltung:02.06.2017
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:05.07.2016
Referierte Publikation:Nein
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