Substrate-Dependent Kinetics in Tyrosinase-based Biosensing: Amperometry vs. Spectrophotometry

Liza Rassaei, Jin Cui, E.D. Goluch, Serge Joseph Guy Lemay

Research output: Contribution to journalArticleAcademicpeer-review

10 Citations (Scopus)

Abstract

Despite the broad use of enzymes in electroanalytical biosensors, the influence of enzyme kinetics on the function of prototype sensors is often overlooked or neglected. In the present study, we employ amperometry as an alternative or complementary method to study the kinetics of tyrosinase, whose catalytic activity results in o-quinone products. We further compare our results for four monophenolic substrates with those obtained from ultraviolet–visible spectrophotometry and show that the results from both assays are in good agreement. We also observe large variations in the enzyme kinetics for different monophenolic substrates depending on the R-group at the para position. To further study this effect, we investigate the stability of quinone products in the enzymatic assay. This information can in principle be utilized to discriminate between different phenolic species by monitoring the reaction rate
Original languageEnglish
Pages (from-to)1577-1584
JournalAnalytical and bioanalytical chemistry
Volume403
Issue number6
DOIs
Publication statusPublished - 25 Apr 2012

Keywords

  • IR-84825
  • METIS-291165

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