DNA based gold nanoparticles colorimetric sensors for sensitive and selective detection of Ag(I) ions

Li, Bingling; Du, Yan; Dong, Shaojun

doi:10.1016/j.aca.2009.04.022

Cited by 137 publications

(86 citation statements)

References 29 publications

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“…The interaction between Ag + and cytosine-cytosine (C-C) mismatches has been extensively studied and numerous oligonucleotide-based fluorescent Ag + sensors have been developed [9,[18][19][20][21][22][23]. Ono et al reported the selective interaction of Ag + with C-C mismatches, and developed a fluorescent Ag + sensor for detecting aqueous Ag + ions using C-rich silver-specific oligonucleotides (SSO) doubly labeled with a fluorophore and a quencher [18].…”

Section: Introductionmentioning

confidence: 99%

A Label-Free Oligonucleotide Based Thioflavin-T Fluorescent Switch for Ag+ Detection with low Background Emission

Wang

Geng

et al. 2012

J Fluoresc

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A novel fluorescent Ag(+) sensor was developed based on the label-free silver (I) specific oligonucleotide (SSO) and Thioflavine T (ThT) monomer-excimer switch. C-rich SSO which contain C-C mismatched base pairs can selectively bind to Ag(+) ions and the formed duplexes which constructed by C-Ag(+)-C structure are thermally stabilized without largely altering the double helical structure. ThT give very weak fluorescent in bulk solution and/or in the presence of SSO. However ThT shows high fluorescence in the presence of SSO and Ag(+) at the same time mainly because ThT excimer, which has the high quantum yield, formed and stabilized in the minor or major groove. Based on the discovery, we developed the novel Ag(+) sensor. Under the optimum condition, the selectivity of this system for Ag(+) over other metal ions in aqueous solution is remarkably high, and Ag(+) can be quantified over the dynamic range of 30-450 nM, with a limit of detection of ~16 nM and a linear correlation coefficient of 0.995.

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Section: Introductionmentioning

confidence: 99%

A Label-Free Oligonucleotide Based Thioflavin-T Fluorescent Switch for Ag+ Detection with low Background Emission

Wang

Geng

et al. 2012

J Fluoresc

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“…With regards to portable and more efficient analytic sensors for detecting dsDNA in clinical samples, conjugated polymer-based sensors (Ho et al, 2002(Ho et al, , 2005Jung et al, 2008Jung et al, , 2010Lee et al, 2007;Wang et al, 2006;Wang and Ma, 2005) have the important advantage of amplifying signals in response to external stimuli as compared to conventional sensors that are based on small molecules (Ali and Li, 2009;Du and Tang, 2011;Li et al, 2009;Li and Rothberg, 2004). The versatile and stable conjugated polydiacetylene (PDA) has useful structural and sensing properties when its head group is linked to ligands that can recognize external stressors such as pH, organic solvents, mechanical stress, and specific molecules.…”

Section: Introductionmentioning

confidence: 97%

Colorimetric detection of clinical DNA samples using an intercalator-conjugated polydiacetylene sensor

Jung

Park

2015

Biosensors and Bioelectronics

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“…In particular, functionalized gold nanoparticles (AuNPs) have become emerging material for the detection of Ag + due to their high extinction coefficient and distance-dependent optical properties. To date, cytosine-(C)-rich oligonucleotide, Tween-20, pyridines, and ionophore-functionalized AuNPs have been reported for the detection of Ag + [6][7][8][9]. However, these functionalized AuNPs suffer from low water solubility, multistep organic synthesis, high cost, and unstable structure.…”

Section: Introductionmentioning

confidence: 98%

One-pot Preparation of Creatinine-functionalized Gold Nanoparticles for Colorimetric Detection of Silver Ions

Liang

Song

2015

Plasmonics

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Creatinine-functionalized AuNPs (CreAuNPs) were prepared via a facile one-pot reaction of sodium borohydride and the mixture solution of gold(III) chloride trihydrate and creatinine. The morphology and surface state of as-prepared CreAuNPs were characterized by transmission electron microscopy and Fourier transform infrared spectroscopy. All the results demonstrated that CreAuNPs were spherical with an average diameter of about 4.2 nm, and creatinine existed on the surface of AuNPs via Au-N interaction. The as-prepared CreAuNPs exhibited a weak surface plasmon resonance (SPR) absorption owing to their small size, while the addition of Ag + could induce the aggregation of spherical CreAuNPs, producing a strong SPR absorption and apparent color change from colorless to purple owing to the surface plasmon coupling. On this basis, a colorimetric assay for Ag + was established. The assay could selectively detect Ag + as low as 1 μM with a good linearity in the range of 5-40 μM. Additionally, the assay was successfully applied to the determination of Ag + in tap water, lake water, and river water samples.

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DNA based gold nanoparticles colorimetric sensors for sensitive and selective detection of Ag(I) ions

Cited by 137 publications

References 29 publications

A Label-Free Oligonucleotide Based Thioflavin-T Fluorescent Switch for Ag+ Detection with low Background Emission

A Label-Free Oligonucleotide Based Thioflavin-T Fluorescent Switch for Ag+ Detection with low Background Emission

Colorimetric detection of clinical DNA samples using an intercalator-conjugated polydiacetylene sensor

One-pot Preparation of Creatinine-functionalized Gold Nanoparticles for Colorimetric Detection of Silver Ions

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