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  • Visual detection of Hg2+ based on Hg(2+)-xanthine complex preventing aggregation of gold nanoparticles.

Visual detection of Hg2+ based on Hg(2+)-xanthine complex preventing aggregation of gold nanoparticles.

Journal of nanoscience and nanotechnology (2014-04-18)
Wen Dan Pu, Hua Wen Zhao, Cheng Zhi Huang, Li Ping Wu, Dan Xu
ABSTRACT

Xanthine, which can specifically bind with mercury ion (Hg2+) to form xanthine-Hg(2+)-xanthine complex, was used as Hg2+ binding molecule in this paper. In the absence of Hg2+, imide group of xanthine easily adsorbs onto the surface of gold nanoparticles (AuNPs) and induces aggregation of AuNPs, resulting in a blue color. In the presence of Hg2+, however, the selective binding of xanthine with Hg2+ prevents the AuNPs against xanthine induced aggregation, resulting in a visible color change from blue to red depend on the concentration of Hg2+. Therefore, taking advantage of this phenomenon, a simple, cost-effective and rapid method can be established for Hg2+ visual detection. This method allows the detection of Hg2+ in the range of 0.075-4.0 microM with a detection limit (3sigma/slope) of 15 nM, and exhibits a high selectivity toward Hg2+ over other metal ions. Particularly, as low as 0.5 microM Hg2+ can be easily detected by the naked eye without using any complicated or expensive instruments.

MATERIALS
Product Number
Brand
Product Description

Gold, tube, 50mm, outside diameter 8mm, inside diameter 7.8mm, wall thickness 0.1mm, as drawn, 99.95%
Gold, insulated wire, 1m, conductor diameter 0.075mm, insulation thickness 0.012mm, PTFE (polytetrafluoroethylene) insulation, 99.99%
Gold, microfoil, disks, 10mm, thinness 0.5μm, specific density 966μg/cm2, permanent mylar 3.5μm support, 99.99+%
Gold, insulated wire, 0.5m, conductor diameter 0.125mm, insulation thickness 0.014mm, polyester insulation, 99.99%
Gold, insulated wire, 5m, conductor diameter 0.05mm, insulation thickness 0.007mm, polyester insulation, 99.99%
Gold, insulated wire, 0.5m, conductor diameter 0.125mm, insulation thickness 0.016mm, PTFE (polytetrafluoroethylene) insulation, 99.99%
Gold, insulated wire, 0.5m, conductor diameter 0.075mm, insulation thickness 0.012mm, PTFE (polytetrafluoroethylene) insulation, 99.99%
Gold, insulated wire, 2m, conductor diameter 0.125mm, insulation thickness 0.014mm, polyester insulation, 99.99%
Gold, insulated wire, 0.1m, conductor diameter 0.125mm, insulation thickness 0.016mm, PTFE (polytetrafluoroethylene) insulation, 99.99%
Gold, insulated wire, 1m, conductor diameter 0.05mm, insulation thickness 0.007mm, polyester insulation, 99.99%
Gold, tube, 100mm, outside diameter 3.0mm, inside diameter 2.8mm, wall thickness 0.10mm, as drawn, 99.95%
Gold, rod, 25mm, diameter 4.0mm, as drawn, 99.95%
Gold, microfoil, disks, 10mm, thinness 0.01μm, specific density 20.7μg/cm2, permanent mylar 3.5μm support, 99.99+%
Gold, tube, 200mm, outside diameter 2.0mm, inside diameter 1.8mm, wall thickness 0.1mm, as drawn, 99.95%
Gold, tube, 100mm, outside diameter 1.0mm, inside diameter 0.5mm, wall thickness 0.25mm, as drawn, 99.95%
Gold, microfoil, disks, 10mm, thinness 0.05μm, specific density 101.3μg/cm2, permanent mylar 3.5μm support, 99.99+%
Gold, rod, 100mm, diameter 2.0mm, as drawn, 99.95%
Gold, insulated wire, 1m, conductor diameter 0.05mm, insulation thickness 0.007mm, polyimide insulation, 99.99%
Gold, tube, 200mm, outside diameter 2.0mm, inside diameter 1.7mm, wall thickness 0.15mm, as drawn, 99.95%
Gold, tube, 50mm, outside diameter 1.0mm, inside diameter 0.5mm, wall thickness 0.25mm, as drawn, 99.95%
Gold, tube, 100mm, outside diameter 1.60mm, inside diameter 0.6mm, wall thickness 0.5mm, as drawn, 99.95%
Gold, rod, 25mm, diameter 3.0mm, as drawn, 99.95%
Gold, insulated wire, 0.5m, conductor diameter 0.025mm, insulation thickness 0.005mm, polyester insulation, 99.99%
Gold, tube, 200mm, outside diameter 1.0mm, inside diameter 0.5mm, wall thickness 0.25mm, as drawn, 99.95%
Gold, microfoil, disks, 10mm, thinness 0.1μm, specific density 204.1μg/cm2, permanent mylar 3.5μm support, 99.99+%
Gold, microleaf disks, 10mm, thinness 0.5μm, specific density 966μg/cm2, removable support, 99.99+%
Gold, insulated wire, 2m, conductor diameter 0.075mm, insulation thickness 0.012mm, PTFE (polytetrafluoroethylene) insulation, 99.99%
Gold, rod, 6mm, diameter 6.0mm, as drawn, 99.95%
Gold, tube, 100mm, outside diameter 10.0mm, inside diameter 9.7mm, wall thickness 0.15mm, as drawn, 99.95%
Gold, rod, 10mm, diameter 6.0mm, as drawn, 99.95%