Fluorometric assay for the determination of glutathione reductase activity

Andrew M. Piggott, Peter Karuso*

*Corresponding author for this work

Research output: Contribution to journalArticle

59 Citations (Scopus)


The determination of free sulfhydryl groups is important in many aspects of biotechnology, such as measuring the coupling efficiency of thiol-reactive probes, assaying cysteine-containing haptens, and assaying reductase/thiol transferase activity, as well as in various aspects of the food industry. This is generally achieved colorimetrically using Ellman's reagent, although the assay is relatively insensitive and Ellman's reagent is unstable. In this paper, we describe a highly sensitive fluorometric assay for free sulfhydryl groups based on FRET, which we have used to develop a sensitive assay for glutathione reductase activity. The assay exploits the specific increase in fluorescence intensity that occurs at 520 nm when a probe containing two molecules of fluorescein linked via a disulfide group is cleaved by glutathione. The assay is 2 orders of magnitude more sensitive than the commonly used colorimetric glutathione reductase assay and has a greater dynamic range.

Original languageEnglish
Pages (from-to)8769-8773
Number of pages5
JournalAnalytical Chemistry
Issue number22
Publication statusPublished - 15 Nov 2007

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