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Nano Research

, Volume 5, Issue 7, pp 486–493 | Cite as

A facile assay for direct colorimetric visualization of lipopolysaccharides at low nanomolar level

  • Jiayu Sun
  • Jiechao Ge
  • Weimin Liu
  • Xueliang Wang
  • Zhiyuan Fan
  • Wenwen Zhao
  • Hongyan Zhang
  • Pengfei WangEmail author
  • Shuit-Tong Lee
Research Article

Abstract

We report a facile assay for the rapid visual detection of lipopolysaccharide (LPS) molecules down to the low nanomolar level by taking advantage of the electrostatic interaction between LPS molecules and cysteamine-modified gold nanoparticles (CSH-Au NPs). The large amount of negatively charged groups on the LPS molecules make LPS highly negatively charged. Thus, when modified with cysteamine, the positively charged gold nanoparticles can aggregate in the presence of trace amounts of LPS. The probe is simple, does not require any advanced instrumentation, and the limit of detection (LOD) was determined to be as low as 3.3 × 10−10 mol/L. To the best of our knowledge, it is the most sensitive synthetic LPS sensor reported so far.

Keywords

Lipopolysaccharide (LPS) endotoxin Gram-negative sensor gold nanoparticle 

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Copyright information

© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Jiayu Sun
    • 1
  • Jiechao Ge
    • 1
  • Weimin Liu
    • 1
  • Xueliang Wang
    • 1
  • Zhiyuan Fan
    • 1
  • Wenwen Zhao
    • 1
  • Hongyan Zhang
    • 1
  • Pengfei Wang
    • 1
    Email author
  • Shuit-Tong Lee
    • 2
  1. 1.Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijingChina
  2. 2.Center of Super-Diamond and Advanced Films (COSDAF) and Department of Physics and Materials ScienceCity University of Hong KongHong KongChina

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