A DNA - Gold nanoparticle-based colorimetric competition assay for the detection of cysteine

Jae Seung Lee; Pirmin A. Ulmann; Min Su Han; Chad A. Mirkin

doi:10.1021/nl0727563

A DNA - Gold nanoparticle-based colorimetric competition assay for the detection of cysteine

Jae Seung Lee, Pirmin A. Ulmann, Min Su Han, Chad A. Mirkin

Research output: Contribution to journal › Article › peer-review

451 Citations (Scopus)

Abstract

We report the development of a highly sensitive and selective colorimetric detection method for cysteine based upon oligonucleotide-functionalized gold nanoparticle probes that contain strategically placed thymidine-thymidine (T-T) mismatches complexed with Hg ²⁺. This assay relies upon the distance-dependent optical properties of gold nanoparticles, the sharp melting transition of oligonucleotide-linked nanoparticle aggregates, and the very selective coordination of Hg ²⁺ with cysteine. The concentration of cysteine can be determined by monitoring with the naked eye or a UV-vis spectrometer the temperature at which the purple-to-red color change associated with aggregate dissociation takes place. This assay does not utilize organic cosolvents, enzymatic reactions, light-sensitive dye molecules, lengthy protocols, or sophisticated instrumentation thereby overcoming some of the limitations of more conventional methods.

Original language	English
Pages (from-to)	529-533
Number of pages	5
Journal	Nano Letters
Volume	8
Issue number	2
DOIs	https://doi.org/10.1021/nl0727563
Publication status	Published - 2008 Feb
Externally published	Yes

ASJC Scopus subject areas

Bioengineering
Chemistry(all)
Materials Science(all)
Condensed Matter Physics
Mechanical Engineering

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10.1021/nl0727563

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title = "A DNA - Gold nanoparticle-based colorimetric competition assay for the detection of cysteine",

abstract = "We report the development of a highly sensitive and selective colorimetric detection method for cysteine based upon oligonucleotide-functionalized gold nanoparticle probes that contain strategically placed thymidine-thymidine (T-T) mismatches complexed with Hg 2+. This assay relies upon the distance-dependent optical properties of gold nanoparticles, the sharp melting transition of oligonucleotide-linked nanoparticle aggregates, and the very selective coordination of Hg 2+ with cysteine. The concentration of cysteine can be determined by monitoring with the naked eye or a UV-vis spectrometer the temperature at which the purple-to-red color change associated with aggregate dissociation takes place. This assay does not utilize organic cosolvents, enzymatic reactions, light-sensitive dye molecules, lengthy protocols, or sophisticated instrumentation thereby overcoming some of the limitations of more conventional methods.",

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AU - Lee, Jae Seung

AU - Ulmann, Pirmin A.

AU - Han, Min Su

AU - Mirkin, Chad A.

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Y1 - 2008/2

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AB - We report the development of a highly sensitive and selective colorimetric detection method for cysteine based upon oligonucleotide-functionalized gold nanoparticle probes that contain strategically placed thymidine-thymidine (T-T) mismatches complexed with Hg 2+. This assay relies upon the distance-dependent optical properties of gold nanoparticles, the sharp melting transition of oligonucleotide-linked nanoparticle aggregates, and the very selective coordination of Hg 2+ with cysteine. The concentration of cysteine can be determined by monitoring with the naked eye or a UV-vis spectrometer the temperature at which the purple-to-red color change associated with aggregate dissociation takes place. This assay does not utilize organic cosolvents, enzymatic reactions, light-sensitive dye molecules, lengthy protocols, or sophisticated instrumentation thereby overcoming some of the limitations of more conventional methods.

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A DNA - Gold nanoparticle-based colorimetric competition assay for the detection of cysteine

Abstract

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