Towards integrated multi-sensor platform using dual electrochemical and optical detection for on-site pollutant detection in water

Fadhila Sekli-Belaidi 1 Léa Farouil 2, 3 Ludovic Salvagnac 4 Pierre Temple-Boyer 1 Isabelle Séguy 1 Jean-Louis Heully 3 Fabienne Alary 3 Eléna Bedel-Pereira 2 Jérôme Launay 1
1 LAAS-MICA - Équipe MICrosystèmes d'Analyse
LAAS - Laboratoire d'analyse et d'architecture des systèmes
2 LAAS-MPN - Équipe Matériaux et Procédés pour la Nanoélectronique
LAAS - Laboratoire d'analyse et d'architecture des systèmes
3 PTC - Photochimie théorique et computationnelle (LCPQ)
LCPQ - Laboratoire de Chimie et Physique Quantiques
4 LAAS-TEAM - Service Techniques et Équipements Appliqués à la Microélectronique
LAAS - Laboratoire d'analyse et d'architecture des systèmes
Abstract : The present work is dedicated to the development of a lab-on-chip (LOC) device for water toxicity environmental analysis and more especially herbicide detection. The final goal is focused on the functional integration of three-electrode electrochemical microcells (ElecCell) and organic photodetectors (OPD) in order to perform simultaneously electrochemical and optical detection in the frame of algal metabolism monitoring. Considering three different algae, i.e. Chlamydomonas reinhardtii, Pseudokirchneriella subcapitata and Chlorella vulgaris while dealing with photosynthesis, the multi-microsensor platform enables to measure the variations of microalgae fluorescence as well as oxygen production. It is applied to study the Diuron herbicide influences on algal metabolism, evidencing fluorescence enhancement and oxygen production inhibition for concentrations as low as few tens of nanomoles. These results are performed with unconcentrated and six time concentrated algae solutions respectively, to estimate the ability of this dual-sensor system to conduct measurements without any sample preparation. Thus, according to the obtained results, the proposed LOC device is fully adapted to the electrochemical/optical dual detection for on-site pollutant analysis, i.e. without sample pre-treatment. 2 Keywords Compact fluidic platform, LED excitation, electrochemical detection, organic photo-detection.algal metabolism, herbicide detection.
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Fadhila Sekli-Belaidi, Léa Farouil, Ludovic Salvagnac, Pierre Temple-Boyer, Isabelle Séguy, et al.. Towards integrated multi-sensor platform using dual electrochemical and optical detection for on-site pollutant detection in water. Biosensors and Bioelectronics, Elsevier, 2019, 132, pp.90-96. ⟨10.1016/j.bios.2019.01.065⟩. ⟨hal-02048795⟩

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