Enzyme Micropump-Based Inhibitor Assays

Isamar Ortiz-Rivera, Taylor M. Courtney, Ayusman Sen

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Rapid, easy-to-use, and portable devices that can provide a read-out without the need for expensive equipment represent the future of sensing technology, with applications in areas like environmental, food, chemical, and biological safety. Enzymes immobilized on a surface function as micropumps in the presence of species (e.g., substrate, cofactor, or biomarker) that trigger the enzymatic reaction. The flow speed in these devices increases with increasing reaction rate. This allows the detection of substances that inhibit the enzymatic reaction. Using this principle, sensors for toxic substances, like mercury, cadmium, cyanide, and azide, were designed using urease and catalase-powered pumps, respectively, with limits of detection well below the concentrations permitted by the Environmental Protection Agency. The study was also extended to other inhibitors for these enzymes. The sensing range of fluid flow-based inhibitor assays depends on the type of inhibition, the enzyme concentration on the sensing platform, and, for competitive inhibition, the concentration of substrate used.

Original languageEnglish (US)
Pages (from-to)2135-2142
Number of pages8
JournalAdvanced Functional Materials
Volume26
Issue number13
DOIs
StatePublished - Apr 5 2016

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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