Gold Nanoparticle-Based Miniaturized Nanomaterial Surface Energy Transfer Probe for Rapid and Ultrasensitive Detection of Mercury in Soil, Water, and Fish

Fluorescence resonance energy transfer between the metal core and the ligand in Au 25 SG 18 (SG-glutathione thiolate) is demonstrated using dansyl chromophores attached to the cluster core through glutathione linkers. The dansyl chromophore functionalization of the cluster has been carried out by two different routes. Efficient energy transfer from the dansyl donor to the Au 25 core is manifested by way of the reduced lifetime of the excited state of the former and drastic quenching of its fluorescence. The donor-acceptor separation observed in the two synthetic routes reflects the asymmetry in the ligand binding on the cluster core, which is in agreement with the recent theoretical and experimental results on the structure of Au 25 .

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“…Synthesis of Au 25 SG 18 . Au 25 SG 18 was synthesized from the as-prepared Au@SG clusters by ligand etching.…”

Section: Methodsmentioning

confidence: 99%

Quantum Clusters of Gold Exhibiting FRET

et al. 2008

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“…Transmission electron microscope (TEM) and UV-visible absorption spectrum were used to characterize the nanoparticles. The particle concentration was measured by UV-visible spectroscopy using the molar extinction coefficients at the wavelength of the maximum absorption of each gold colloid as reported recently 11,[25][26][27][28] [ (15) …”

Section: Gold Nanoparticle Synthesismentioning

confidence: 99%

“…11 The gold nanoparticle surface was attached with MPA and HCys through a -SH bond using a method similar to one we have described before. 11 We have added 10 mM MPA (10 L) and 2 mM HCys (10 L) to the gold nanoparticle solution (15 nM, 10 mL) with stirring. After 2 h, (5-8) mM NaBH 4 was added, and the mixture was left for few hours without disturbance.…”

Section: Gold Nanoparticle Surface Modificationmentioning

confidence: 99%

Selective Detection of Mercury (II) Ion Using Nonlinear Optical Properties of Gold Nanoparticles

et al. 2008

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Contamination of the environment with heavy metal ions has been an important concern throughout the world for decades. Driven by the need to detect trace amounts of mercury in environmental samples, this article demonstrates for the first time that nonlinear optical (NLO) properties of MPA-HCys-PDCA-modified gold nanoparticles can be used for rapid, easy and reliable screening of Hg(II) ions in aqueous solution, with high sensitivity (5 ppb) and selectivity over competing analytes. The hyper Rayleigh scattering (HRS) intensity increases 10 times after the addition of 20 ppm Hg 2+ ions to modified gold nanoparticle solution. The mechanism for HRS intensity change has been discussed in detail using particle size-dependent NLO properties as well as a two-state model. Our results show that the HRS assay for monitoring Hg(II) ions using MPAHCys-PDCA-modified gold nanoparticles has excellent selectivity over alkali, alkaline earth (Li + , Na + , K + , Mg 2+ , Ca 2+ ), and transition heavy metal ions (Pb 2+ , Pb + , Mn 2+ , Fe 2+ , Cu 2+ , Ni 2+ , Zn 2+ , Cd 2+ ).

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“…Among various synthesis methods, plant-mediated synthesis is preferred due to its cost effectiveness and environment-friendly nature [3,4]. GNP have applications in therapeutic [5], catalysis [2], immunoassay and immunosensing [6], diagnostic and drug delivery [7][8][9][10], analyte sensing [11][12][13], cancer cell diagnostics and selective photothermal therapy [14,15], photoacoustic imaging [16,17] and cancer treatment [18]. Various plant extracts have been explored for the synthesis of GNP, namely tamarind [19], Aloe vera [20], Pelargonium graveolens [21], Diopyros kaki [22], Eucalyptus camaldulensis and Pelargonium roseum [23], coriander [24], Scutellaria barbata [25], lemongrass [26], Datura metel, Carica papaya and Solanum melongena [27].…”

Section: Introductionmentioning

confidence: 99%

Characterisation of gold nanoparticles synthesised by leaf and seed extract ofSyzygium cuminiL.

Kumar

Yadav

2012

Journal of Experimental Nanoscience

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Here, Syzygium cumini leaf extract (LE) and seed extract (SE) were explored for the synthesis of gold nanoparticles (GNP). LE and SE as well as their polar (water) fractions showed potential for GNP synthesis. Comparative synthesis kinetics and morphological characterisation studies revealed the synthesis of smaller sized GNP by LE than SE. Only polar (water) fractions showed potential for GNP synthesis, which are smaller in size compared to their respective extracts. SE contained more polyphenols and biochemical constituents than LE and therefore, showed higher synthesis rate and bigger sized GNP. Atomic force microscope and scanning electron microscope analysis indicated that both extracts and their fractions catalysed the synthesis of spherical GNP. The average size of GNP synthesised by LE, leaf water fraction (LWF), SE and seed water fraction (SWF) were 24, 23, 35 and 32 nm, respectively. Fourier transform infrared analysis identified the biomolecules involved in the synthesis and stability of GNP. This study documented the potential of S. cumini for the synthesis of GNP in addition to silver nanoparticles (SNP). However, nature and types of polyphenols involved in GNP synthesis seem to be different from that involved in SNP synthesis. This might be the possible reason for smaller sized GNP that SNP.

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Gold Nanoparticle-Based Miniaturized Nanomaterial Surface Energy Transfer Probe for Rapid and Ultrasensitive Detection of Mercury in Soil, Water, and Fish

Cited by 300 publications

References 28 publications

Quantum Clusters of Gold Exhibiting FRET

Quantum Clusters of Gold Exhibiting FRET

Selective Detection of Mercury (II) Ion Using Nonlinear Optical Properties of Gold Nanoparticles

Characterisation of gold nanoparticles synthesised by leaf and seed extract ofSyzygium cuminiL.

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