Monitoring the activity of tyrosinase on a tyramine/dopamine-functionalized surface by force microscopy

Adam B. Braunschweig, Roey Elnathan, Itamar Willner

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Tyrosinase activity is monitored by π-donor-acceptor force interactions between a bipyridinium-modified AFM tip and the biocatalytic reaction product generated on a tyramine- (or dopamine-) modified surface. Upon oxidation of the surface to dopaquinone as a result of tyrosinase activity, force interactions are switched "OFF". After reduction of the resulting surface with ascorbic acid, forces are quantitatively reestablished as a result of the formation of the dopamine-functionalized surfaces. The method provides a general approach to design biosensors using force interactions as the readout signal.

Original languageEnglish
Pages (from-to)2030-2036
Number of pages7
JournalNano Letters
Issue number7
Publication statusPublished - 1 Jul 2007
Externally publishedYes

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