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Whole-cell luminescence-based flow-through biodetector for toxicity testing.

Philipp Stolper¹, Susanne Fabel, Michael G Weller

¹Institut für Wasserchemie & Chemische Balneologie, Technische Universität München, Marchioninistr. 17, 81377, München, Germany.

Analytical and Bioanalytical Chemistry

|December 25, 2007

Summary

A novel flow-through biodetector using Vibrio fischeri bacteria enables rapid toxicity screening. This system offers faster detection of pollutants compared to traditional methods.

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Area of Science:

Environmental Science
Analytical Chemistry
Biotechnology

Background:

Bioluminescence assays with Vibrio fischeri are established for toxicity testing.
Traditional methods often require longer incubation and larger sample volumes.
Continuous flow systems offer potential for faster and more efficient analysis.

Purpose of the Study:

To develop and validate a modified commercial luminescence detector for continuous flow-through biodetection.
To enable rapid screening of toxic substances using a minimal sample volume.
To compare the performance of the new flow-through system with a standard microplate format.

Main Methods:

Modification of a commercial tube luminescence detector to incorporate a flow cell.
Implementation of an air-segmented flow system for peak separation in a reaction coil.

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Optimization of incubation time (5.6 min) and flow rates (110-150 µL/min) for rapid analysis.

Detection of five chlorophenols at concentrations from 1 to 200 mg/L.

Main Results:

The flow-through biodetector successfully detected and quantified chlorophenols.
Inhibition rates were generally twofold lower than the microplate format but detection was significantly faster.
The system utilizes small sample volumes (20 µL).

Conclusions:

The developed flow-through biodetector provides a rapid and efficient method for environmental toxicity monitoring.
This system demonstrates a viable alternative to conventional batch-based assays for screening toxic substances.
Further optimization could enhance sensitivity and broaden the range of detectable pollutants.