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Related Concept Videos

Immunogold Electron Microscopy01:20

Immunogold Electron Microscopy

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Immunoelectron microscopy utilizes immunogold labeling of endogenous proteins with specific antibodies to detect and localize these proteins in cells and tissues. The procedure provides insights into the distribution and quantification of protein under different stimulation conditions offering clues about their functions. Conjugating highly electron-dense gold particles with primary or secondary antibodies allow antigen detection on and within cells, with high resolution and specificity.
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Gold Nanoparticle Modified Carbon Fiber Microelectrodes for Enhanced Neurochemical Detection
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Sensitive electrochemical immunosensor based on three-dimensional nanostructure gold electrode.

Guangxian Zhong1, Ruilong Lan2, Wenxin Zhang3

  • 1Department of Pharmaceutical Analysis, Faculty of Pharmacy, Fujian Medical University, Fuzhou, People's Republic of China ; Department of Orthopaedics, First Affiliated Hospital of Fujian Medical University, Fuzhou, People's Republic of China.

International Journal of Nanomedicine
|April 3, 2015
PubMed
Summary
This summary is machine-generated.

A novel electrochemical immunosensor for alpha-fetoprotein (AFP) detection was created using a 3D gold nanostructure electrode. This sensitive and selective biosensor offers a promising tool for early cancer diagnosis and prognosis monitoring.

Keywords:
alpha-fetoproteinelectrochemical immunosensorssquare-wave oxidation-reduction cyclethree-dimensional nanostructure gold electrode

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Area of Science:

  • Electrochemistry
  • Nanotechnology
  • Biomedical Engineering

Background:

  • Alpha-fetoprotein (AFP) is a crucial biomarker for diagnosing and monitoring liver cancer and other conditions.
  • Sensitive and selective detection methods are vital for accurate clinical diagnosis and prognosis.
  • Existing detection methods may lack the sensitivity, speed, or cost-effectiveness required for widespread clinical application.

Purpose of the Study:

  • To develop a sensitive and selective electrochemical immunosensor for the detection of alpha-fetoprotein (AFP).
  • To utilize a facile, rapid, and green electrochemical technique for sensor fabrication and detection.
  • To evaluate the performance of the developed immunosensor for AFP detection in human serum samples.

Main Methods:

  • Fabrication of a three-dimensional nanostructure gold electrode using a square-wave oxidation-reduction cycle technique.
  • Characterization of the gold nanocomposites using scanning electron microscopy and cyclic voltammetry.
  • Implementation of a "sandwich-type" electrochemical immunosensor strategy for AFP detection.

Main Results:

  • The electrochemical immunosensor demonstrated a good linear relationship between current response and AFP concentration in the range of 10-50 ng/mL.
  • A low detection limit of 3 pg/mL was achieved under optimal conditions.
  • The immunosensor exhibited fast amperometric response, high sensitivity, and excellent selectivity.
  • Successful determination of AFP in human serum samples with a relative standard deviation of <5% (n=5).

Conclusions:

  • The developed electrochemical immunosensor offers a highly sensitive, selective, and rapid method for AFP detection.
  • The use of a 3D nanostructure gold electrode and green electrochemical techniques enhances sensor performance.
  • This advanced immunosensor shows significant potential for practical applications in clinical diagnosis and prognosis monitoring.