Enzymatic Photometric Assays for the Selective Detection of Halides

Research output: Chapter in Book/Report/Conference proceedingChapter (peer-reviewed)peer-review


Halides are substrates and products of a number of biotechnologically important enzymes like dehalogenases, halide methyltransferases, and halogenases. Therefore, the determination of halide concentrations in samples is important. The classical methods based on mercuric thiocyanate are very dangerous, produce hazardous waste, and do not discriminate between chloride, bromide, and iodide. In this chapter, we describe a detailed protocol for the determination of halide concentrations based on the haloperoxidase-catalyzed oxidation of halides. The resulting hypohalous acids are detected using commercially available colorimetric or fluorimetric probes. The biocatalytic nature of the assays allows them to be implemented in one-pot cascade reactions with halide-generating enzymes. Since chloride is ubiquitous in biological systems, we also describe convenient photometric assays for the selective detection of bromide and iodide in the presence of chloride, obviating the need for laborious dialyses to obtain halide-free enzymes and reagents.
Original languageEnglish
Title of host publicationMultienzymatic Assemblies
Subtitle of host publicationMethods and Protocols
EditorsHaralambos Stamatis
ISBN (Electronic)978-1-0716-2269-8
ISBN (Print)978-1-0716-2268-1
Publication statusPublished - 1 Jul 2022

Publication series

NameMethods in Molecular Biology
ISSN (Print)1064-3745
ISSN (Electronic)1940-6029

Cite this