Simultaneous quantification of the fluorescent responses of an ensemble of bacterial sensors

Yossef Kabessa*, Victor Korouma, Har'el Ilan, Sharon Yagur-Kroll, Shimshon Belkin, Aharon J. Agranat

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Bacterial bioreporters are genetically engineered microbial strains capable of detecting specific chemicals, groups of chemicals or global biological effects such as toxicity or genotoxicity. A scheme for simultaneous selective detection of the fluorescent signals emitted by a bacterial biosensor array, able to detect four different types of toxicants, using a single photodetector (photomultiplier) is presented. The underlying principle of the scheme is to convert the spatially distributed signals from all the elements in the array to temporally distributed frequency multiplexed signals at the output of the photodetector. Experimental proof of this concept is demonstrated in a four-channel system, in which low power (a few tens of picowatts) fluorescent signals produced by the bacterial sensors are measured, while maintaining a wide dynamic range of detection (more than 3 orders of magnitude). Simultaneous monitoring of concentrations down to a few mg/l of different chemicals in a liquid sample is demonstrated.

Original languageAmerican English
Pages (from-to)394-398
Number of pages5
JournalBiosensors and Bioelectronics
Volume49
DOIs
StatePublished - 5 Nov 2013

Bibliographical note

Funding Information:
Yossef Kabessa acknowledges the support of the Brojde Center for Innovative Engineering and Computer Science . Har'el Ilan acknowledges the support of the Eshkol Fellowships Foundation Grant no. 3-6435 , of the Israeli Ministry of Science . Research by S.Yagur-Kroll and S. Belkin was supported in part by the Minerva Center for Bio-Hybrid complex systems . We thank Professor Uri Alon from the Weizmann Institute of Science for the bacterial reporter strains.

Keywords

  • Bacterial whole-cell biosensors
  • Fluorescence
  • GFP reporter gene
  • Simultaneous sampling

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