Rapid detection of Shiga toxin type II using lateral flow immunochromatography test strips of colorimetry and fluorimetry

Analyst. 2019 Dec 16;145(1):76-82. doi: 10.1039/c9an01996k.

Abstract

Two types of lateral flow immunochromatographic test strips (LFITS) using gold nanoparticles and fluorescent CdTe quantum dots (QDs) as signal labels, respectively, were developed for Shiga toxin type II (STX2) assays. Under optimal conditions, the corresponding visual detection limits were 25 ng mL-1 and 5 ng mL-1, respectively. The test results of gold based LFITS can be recognized directly by the naked eye, whereas the visualized results of CdTe QDs based LFITS can be observed by the aid of a UV lamp. Both assays showed good specificity and stability. The inexpensive LFITS were promising for the rapid clinical detection of STX2.

MeSH terms

  • Antibodies / immunology
  • Cadmium Compounds / chemistry
  • Chromatography, Affinity / instrumentation
  • Chromatography, Affinity / methods*
  • Colorimetry / instrumentation
  • Colorimetry / methods*
  • Fluorescent Dyes / chemistry
  • Fluorometry / instrumentation
  • Fluorometry / methods*
  • Gold / chemistry
  • Limit of Detection
  • Metal Nanoparticles / chemistry
  • Quantum Dots / chemistry
  • Reagent Strips*
  • Shiga Toxin 2 / analysis*
  • Shiga Toxin 2 / immunology
  • Tellurium / chemistry

Substances

  • Antibodies
  • Cadmium Compounds
  • Fluorescent Dyes
  • Reagent Strips
  • Shiga Toxin 2
  • Gold
  • Tellurium
  • cadmium telluride