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Updated: Jan 28, 2026

Bacterial Detection & Identification Using Electrochemical Sensors
Published on: April 23, 2013
Towards integrated multi-sensor platform using dual electrochemical and optical detection for on-site pollutant
F Sekli Belaïdi1, L Farouil1, L Salvagnac1
1CNRS, LAAS, 7 Avenue du Colonel Roche, F-31400 Toulouse, France; Université de Toulouse, UPS, LAAS, F-31400 Toulouse, France.
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, ie. 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, ie. without sample pre-treatment.
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