Internal response correction for fluorescent whole-cell biosensors

Mara Mirasoli, Jessika Feliciano, Elisa Michelini, Sylvia Daunert, Aldo Roda

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Whole-cell biosensors based on reporter genes are finding a variety of applications in analytical chemistry. Despite their ability to selectively recognize the analyte in a complex mixture, few applications of such sensing devices to real sample analysis are reported. This is mainly due to nonspecific effects on the biosensor response caused by components of the sample matrix and by environmental changes. To overcome this problem, a bacterial biosensor with an internal correction mechanism of the analytical response was developed by introducing an additional reporter gene that provides a reference signal of the analytical performance of the biosensor. The first reporter (GFPuv), expressed in response to the concentration of L-arabinose, provides the analytical signal; the second reporter (EYFP), constitutively expressed if a constant amount of IPTG is added to each sample, was used as an internal reference. By inducing the biosensor with varying amounts of L-arabinose and a constant amount of IPTG, it was possible to obtain a dose-response curve for L-arabinose, together with a constant production of EYFP, which allowed for a dynamic evaluation of the metabolic activity of the cell. When tested in nonoptimal conditions (e.g., in the presence of either ethanol or deoxycholic acid at toxic concentrations), the presence of the internal reference system corrected the analytical response due to nonspecific interferences.

Original languageEnglish
Pages (from-to)5948-5953
Number of pages6
JournalAnalytical Chemistry
Volume74
Issue number23
DOIs
StatePublished - Dec 1 2002
Externally publishedYes

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Biosensors
Arabinose
Isopropyl Thiogalactoside
Genes
Deoxycholic Acid
Poisons
Complex Mixtures
Ethanol
Cells
Chemical analysis

ASJC Scopus subject areas

  • Analytical Chemistry

Cite this

Internal response correction for fluorescent whole-cell biosensors. / Mirasoli, Mara; Feliciano, Jessika; Michelini, Elisa; Daunert, Sylvia; Roda, Aldo.

In: Analytical Chemistry, Vol. 74, No. 23, 01.12.2002, p. 5948-5953.

Research output: Contribution to journalArticle

Mirasoli, M, Feliciano, J, Michelini, E, Daunert, S & Roda, A 2002, 'Internal response correction for fluorescent whole-cell biosensors', Analytical Chemistry, vol. 74, no. 23, pp. 5948-5953. https://doi.org/10.1021/ac0259008
Mirasoli, Mara ; Feliciano, Jessika ; Michelini, Elisa ; Daunert, Sylvia ; Roda, Aldo. / Internal response correction for fluorescent whole-cell biosensors. In: Analytical Chemistry. 2002 ; Vol. 74, No. 23. pp. 5948-5953.
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