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Related Concept Videos

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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A Microfluidic-based Electrochemical Biochip for Label-free DNA Hybridization Analysis
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A G-quadruplex based label-free fluorescent biosensor for lead ion.

Liangqia Guo1, Dandan Nie1, Chunyan Qiu1

  • 1Key Lab of Analysis and Detection for Food Safety of Ministry of Education, Fujian Provincial Key Lab of Analysis and Detection Technology for Food Safety, Department of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, China.

Biosensors & Bioelectronics
|March 16, 2012
PubMed
Summary

A new, cost-effective fluorescent biosensor for lead ions (Pb(2+)) was developed using a novel DNA structure. This simple "mix-and-detect" method offers high sensitivity for detecting lead in water samples.

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Area of Science:

  • Biochemistry
  • Analytical Chemistry
  • Environmental Science

Background:

  • Existing lead ion (Pb(2+)) biosensors often suffer from high costs, complex procedures, and unstable components like RNA.
  • There is a need for simple, stable, and cost-effective biosensing platforms for accurate lead detection.

Purpose of the Study:

  • To develop a novel, label-free fluorescent biosensor for the sensitive and selective detection of lead ions (Pb(2+)).
  • To utilize a Pb(2+)-induced allosteric G-quadruplex (PS2.M) structure for quantitative lead analysis.

Main Methods:

  • A fluorescent detection system was designed using N-methyl mesoporphyrin IX (NMM) and a K(+)-stabilized G-quadruplex (PS2.M).
  • Lead ions (Pb(2+)) were detected by observing the fluorescence quenching resulting from their competitive binding to the G-quadruplex structure, displacing NMM.
  • A convenient "mix-and-detect" protocol was employed for quantitative analysis.

Main Results:

  • The proposed biosensor demonstrated a good linear response for Pb(2+) detection over a concentration range of 5.0 nM to 1.0 μM.
  • A low limit of detection (LOD) of 1.0 nM for Pb(2+) was achieved, indicating high sensitivity.
  • The biosensor exhibited simplicity, cost-efficiency, high sensitivity, and selectivity, and was successfully validated for lead determination in lake water samples.

Conclusions:

  • The novel PS2.M-based fluorescent biosensor offers a practical, sensitive, and cost-effective solution for Pb(2+) detection.
  • This method overcomes limitations of previous biosensors, paving the way for improved environmental monitoring of lead contamination.