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Labeling DNA Probes03:31

Labeling DNA Probes

DNA probes are fragments of DNA labeled with a reporter tag to enable their detection or purification. The resulting labeled DNA probes can then hybridize to target nucleic acid sequences through complementary base-pairing, and may be used to recover or identify these regions.
Radioisotopes, fluorophores, or small molecule binding partners like biotin or digoxigenin, are the most widely used reporter tags for labeling DNA probes. These labels can be attached to the probe DNA molecule via...

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Attaching Biological Probes to Silica Optical Biosensors Using Silane Coupling Agents
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Published on: May 1, 2012

Enzyme-functionalized silica nanoparticles as sensitive labels in biosensing.

Yafeng Wu1, Chengliang Chen, Songqin Liu

  • 1School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 210096, People's Republic of China.

Analytical Chemistry
|January 15, 2009
PubMed
Summary

This study introduces a new method for detecting biomarkers using horseradish peroxidase (HRP)-functionalized silica nanoparticles. This approach significantly enhances detection signals for improved biomarker quantification.

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Area of Science:

  • Biotechnology
  • Nanotechnology
  • Analytical Chemistry

Background:

  • Sensitive detection of biomarkers is crucial for early disease diagnosis.
  • Traditional immunoassay methods often lack sufficient sensitivity and reproducibility.
  • Nanomaterials offer potential for enhancing biosensing capabilities.

Purpose of the Study:

  • To develop a novel strategy for sensitive biomarker detection using functionalized nanoparticles.
  • To improve signal amplification in sandwich immunoassays.
  • To create a cost-effective and reproducible immunosensing platform.

Main Methods:

  • Fabrication of horseradish peroxidase (HRP)-functionalized silica nanoparticles (SiO2) via co-immobilization of HRP and anti-alpha-fetoprotein (anti-AFP) antibody.
  • Utilized gamma-glycidoxypropyltrimethoxysilane (GPMS) for surface linkage.
  • Employed a 'seed-particle growth' synthesis route for controlled particle size and consistent HRP/anti-AFP loading.
  • Evaluated detection performance using electrochemical and chemiluminescence measurements.

Main Results:

  • Demonstrated successful immobilization of HRP and anti-AFP onto SiO2 nanoparticles.
  • Achieved 29.5-fold and 61-fold increases in detection signals via electrochemical and chemiluminescence, respectively, compared to traditional methods.
  • Confirmed enhanced sensitivity due to the large surface area of nanoparticle carriers increasing HRP loading.
  • Narrow particle size distribution ensured high sensitivity and reproducibility in immunosensing.

Conclusions:

  • The developed strategy provides a simple, cost-effective, specific, and potent method for biomarker detection.
  • HRP-functionalized silica nanoparticles significantly amplify detection signals in sandwich immunoassays.
  • This approach shows high sensitivity and reproducibility, suitable for detecting alpha-fetoprotein (AFP) in practical samples.