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Plasmonics

, Volume 5, Issue 4, pp 375–381 | Cite as

Resonance Scattering Spectral Detection of Trace Pb2+ Using Aptamer-Modified AuPd Nanoalloy as Probe

  • Zhiliang JiangEmail author
  • Yanyan Fan
  • Aihui Liang
  • Guiqing Wen
  • Qingye Liu
  • Tingsheng Li
Article

Abstract

The resonance scattering spectral probe for Pb2+ was obtained using aptamer-modified AuPd Nanoalloy. In the pH 7.0 Na2HPO4–NaH2PO4 buffer solution, the aptamer interacted with AuPd nanoalloy particles to form stable aptamer-AuPd nanoalloy probe for Pb2+ that is stable in high concentration of salt. The probe combined with Pb2+ ions to form a G-quadruplex and to release AuPd nanoalloy particles that aggregate to form big particles which led the resonance scattering (RS) intensity enhancing. The reaction solution was filtered by 0.15 μm membrane to obtain the filtration containing aptamer-AuPd nanoalloy probe that has strong catalytic effect on the electrodeless nickel particle plating reaction between Ni(II) and PO 2 3− that exhibited a strong RS peak at 508 nm. The RS intensity at 508 nm decreased when the Pb2+ concentration increased. The decreased intensity (ΔI 508nm) is linear to the concentration of 0.08–42 nM Pb2+, with regress equation of \( \Delta {I_{{5}0{\rm{8nm}}}} = {16}.{3}\,c + {1}.{5} \), correlation coefficient of 0.9965, and detection limit of 0.04 nM Pb2+. The RS assay was applied to the analysis of Pb2+ in wastewater, with satisfactory results.

Keywords

Pb2+ Aptamer probe Au/Pd nanoalloy Nanocatalysis Resonance scattering spectral assay 

Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 20667001, 20865002, 20965002), Natural Science Foundation of Guangxi (No. 0991021Z) and the Foundation of New Century Ten-Hundred-Thousand Talents of Guangxi.

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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • Zhiliang Jiang
    • 1
    Email author
  • Yanyan Fan
    • 1
  • Aihui Liang
    • 1
  • Guiqing Wen
    • 1
  • Qingye Liu
    • 1
  • Tingsheng Li
    • 1
  1. 1.Guangxi Key Laboratory of Environmental Engineering, Protection and AssessmentGuangxi Normal UniversityGuilinChina

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