文献类型：期刊文献

英文题名：Colorimetric assay for parallel detection of Cd²⁺, Ni²⁺ and Co²⁺ using peptide-modified gold nanoparticles

作者：Zhang, Min[1];Liu, Yu-Qiang[1];Ye, Bang-Ce[1]

机构：[1]E China Univ Sci & Technol, Lab Biosyst & Microanal, State Key Lab Bioreactor Engn, Shanghai 200237, Peoples R China

年份：2012

卷号：137

期号：3

起止页码：601

外文期刊名：ANALYST

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000298969000011)】；

基金：This work was financially supported by NSF21075040, the Shanghai 09JC1404100, 11nm0502500 and 11XD1401900, SKLBE Fund 2060204, and the Fundamental Research Funds for the Central Universities.

语种：英文

摘要：A colorimetric assay has been developed for parallel detection of Cd2+, Ni2+ and Co2+ utilizing peptide-modified gold nanoparticles (P-AuNPs) as a sensing element based on its unique surface plasmon resonance properties. The functional peptide ligand, CALNNDHHHHHH, was self-assembled on gold nanoparticles (AuNPs) to produce P-AuNPs probe. The P-AuNPs probe could be used to simultaneously detect and showed different responses to the three ions Cd2+, Ni2+ and Co2+ in an aqueous solution based on the aggregation-induced color change of AuNPs. The method showed good selectivity for Cd2+, Ni2+ and Co2+ over other metal ions, and detection limit as low as 0.05 mu M Cd2+, 0.3 mu M Ni2+ or 2 mu M Co2+. To simultaneously (or parallel) detect the three metal ions coexisting in a sample, EDTA and imidazole were applied to mask Co2+ and Ni2+ for detecting Cd2+, glutathione and EDTA were applied to mask Cd2+ and Co2+ for detecting Ni2+, and glutathione and imidazole were applied to mask Cd2+ and Ni2+ for detecting Co2+. Finally, the simple and cost-effective probe could be successfully applied for simultaneously detecting Cd2+, Ni2+, and Co2+ in river water. Because this novel P-AgNPs-based probe design offers many advantages, including simplicity of preparation and manipulation compared with other methods that employ specific strategies, the sensing system shows potential application in the developing region for monitoring water quality.