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Issue 10, 2016
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Electrocatalytic amplification of DNA-modified nanoparticle collisions via enzymatic digestion

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Abstract

We report a new and general approach that will be useful for adapting the method of electrocatalytic amplification (ECA) to biosensing applications. In ECA, individual collisions of catalytic nanoparticles with a noncatalytic electrode surface lead to bursts of current. In the work described here, the current arises from catalytic electrooxidation of N2H4 at the surface of platinum nanoparticles (PtNPs). The problem with using ECA for biosensing applications heretofore, is that it is necessary to immobilize a receptor, such as DNA (as in the case here) or an antibody on the PtNP surface. This inactivates the colliding NP, however, and leads to very small collision signatures. In the present article, we show that single-stranded DNA (ssDNA) present on the PtNP surface can be detected by selectively removing a fraction of the ssDNA using the enzyme Exonuclease I (Exo I). About half of the current associated with collisions of naked PtNPs can be recovered from fully passivated PtNPs after exposure to Exo I. Experiments carried out using both Au and Hg ultramicroelectrodes reveal some mechanistic aspects of the collision process before and after treatment of the ssDNA-modified PtNPs with Exo I.

Graphical abstract: Electrocatalytic amplification of DNA-modified nanoparticle collisions via enzymatic digestion

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Publication details

The article was received on 16 May 2016, accepted on 22 Jun 2016 and first published on 01 Jul 2016


Article type: Edge Article
DOI: 10.1039/C6SC02165D
Chem. Sci., 2016,7, 6450-6457
  • Open access: Creative Commons BY-NC license
    All publication charges for this article have been paid for by the Royal Society of Chemistry

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    Electrocatalytic amplification of DNA-modified nanoparticle collisions via enzymatic digestion

    A. D. Castañeda, D. A. Robinson, K. J. Stevenson and R. M. Crooks, Chem. Sci., 2016, 7, 6450
    DOI: 10.1039/C6SC02165D

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