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Related Concept Videos

Southern Blot02:57

Southern Blot

Agarose gel electrophoresis is very useful in separating DNA fragments by size. Running a DNA ladder containing fragments of the known length alongside the sample helps determine the approximate length of the sample DNA fragments. However, additional steps are needed to verify the sequence identity of the sample DNA fragments.
Denatured DNA fragments must be transferred onto a carrier membrane from the gel to make it accessible to a probe - a small ssDNA fragment complementary to the target DNA...
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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Fabrication of Electrochemical-DNA Biosensors for the Reagentless Detection of Nucleic Acids, Proteins and Small Molecules
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Published on: June 1, 2011

Sensitive DNA-based electrochemical strategy for trace bleomycin detection.

Bin-Cheng Yin1, Di Wu, Bang-Ce Ye

  • 1Lab of Biosystems and Microanalysis, State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Meilong Road 130, Shanghai, 200237, China.

Analytical Chemistry
|September 7, 2010
PubMed
Summary
This summary is machine-generated.

A novel electrochemical DNA sensor enables sensitive detection of Bleomycins (BLMs), a chemotherapy drug. This method accurately quantifies trace BLMs in samples, aiding in optimizing cancer treatment and minimizing toxic side effects.

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Area of Science:

  • Biomedical Engineering
  • Analytical Chemistry
  • Nanotechnology

Background:

  • Bleomycins (BLMs) are crucial chemotherapy agents, but their use is limited by severe toxic side effects, including pulmonary fibrosis.
  • Accurate quantification of BLMs is essential for therapeutic efficacy and toxicity management in both pharmaceutical analysis and clinical settings.

Purpose of the Study:

  • To develop a sensitive, rapid, and convenient electrochemical assay for the quantitative determination of trace Bleomycins.
  • To create a novel electrochemical DNA (E-DNA) sensor for Bleomycin detection.

Main Methods:

  • Fabrication of an E-DNA sensor by self-assembling a DNA motif onto a gold electrode, functionalized with a ferrocenyl moiety for signal reporting.
  • Utilizing the irreversible DNA cleavage induced by Fe(II)·BLM complex as the detection mechanism, monitored via changes in faradaic current.
  • Testing the sensor's performance with varying concentrations of BLMs and in serum samples.

Main Results:

  • The E-DNA sensor demonstrated high sensitivity, detecting BLMs down to 100 pM.
  • The sensor exhibited a significant decrease in current peak upon interaction with Fe(II)·BLM, indicating successful detection.
  • The assay showed good performance in complex matrices like serum samples.

Conclusions:

  • The developed electrochemical assay provides a sensitive, specific, and cost-effective method for trace BLM determination.
  • This E-DNA sensor offers a promising alternative to conventional methods for BLM quantification in clinical and pharmaceutical applications.
  • The method facilitates better management of BLM therapy by enabling precise monitoring of drug levels.