Resonance scattering spectrum detection of trace UO22+ using nanogold probe as catalyst of Cu(II)-glucose reaction

被引:3
作者
Jiang, Zhiliang [1 ]
Wei, Lin [1 ]
Zhang, Yi [1 ]
Liang, Aihui [1 ]
机构
[1] Guangxi Normal Univ, Sch Environm & Resource, Minist Educ, Key Lab Ecol Rare & Endangered Species & Environm, Guilin 541004, Peoples R China
基金
中国国家自然科学基金;
关键词
UO2 2+; aptamer cracking; nanogold catalysis; Cu2O particle; resonance scattering assay; ENVIRONMENTAL-SAMPLES; URANIUM; ASSAY; ACID;
D O I
10.1080/03067319.2011.609938
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
exhibited catalytic effect on the cracking reaction of double-stranded DNA (dsDNA) to form a short single-stranded DNA (ssDNA) that protected the nanogold (NG) to produce stable NGssDNA conjugate. The un-protected NG was aggregated to form NG aggregates (NGA) that appeared a resonance scattering (RS) peak at 542nm. Unlike NGA, the NGssDNA exhibited a strong catalytic activity on the Cu2O particle reaction of Fehling reagent-glucose that can be monitored by RS technique at 608nm. When the concentration increased, the NGssDNA increased, and the RS intensity at 608nm increased. The increased RS intensity I 608nm was linear to the concentration in the range of 15200pmolL1, with a regression equation of I 608nm=1.24C+4.6, and a detection limit of 5pmolL1. This new RS assay was applied to assay in water sample, with satisfactory results.
引用
收藏
页码:377 / 385
页数:9
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