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Related Concept Videos

Immunogold Electron Microscopy01:20

Immunogold Electron Microscopy

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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Nanogold catalysis-based immunoresonance-scattering spectral assay for trace complement component 3.

Zhiliang Jiang1, Wenxing Huang, Jiangping Li

  • 1Key Laboratory of New Processing Technology for Nonferrous Metals and Materials of Education Ministry, Department of Material and Chemical Engineering, Guilin University of Technology, Guilin, China. zljiang@mailbox.gxnu.edu.cn

Clinical Chemistry
|November 14, 2007
PubMed
Summary

A new immunonanogold catalytic resonance-scattering (RS) assay accurately measures complement component 3 (C3) in human serum. This sensitive method shows promise for diagnosing diseases like hepatitis.

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Area of Science:

  • Biochemistry
  • Immunology
  • Nanotechnology

Background:

  • Complement component 3 (C3) is crucial for innate and adaptive immunity.
  • Assaying C3 levels in serum is important for understanding immune function and disease diagnosis.
  • Existing methods may have limitations in sensitivity or specificity.

Purpose of the Study:

  • To develop and validate a novel immunonanogold catalytic resonance-scattering (RS) technique for C3 quantification in human serum.
  • To assess the sensitivity, selectivity, and reliability of this new assay compared to established methods.

Main Methods:

  • Utilized nanogold-labeled goat antihuman C3 antibodies to create an immunonanogold RS probe.
  • Investigated the catalytic effect of the nanogold probe on chlorauric acid-hydroxylamine particle formation.
  • Employed RS spectroscopy to monitor particle formation and electron microscopy for particle shape analysis.
  • Compared results from the developed assay with immunoturbidimetry using 36 human serum samples.

Main Results:

  • The nanogold probe exhibited a significant catalytic effect, with RS intensity changes proportional to C3 concentration (5.0–160.0 ng/L).
  • Achieved a sensitive detection limit of 1.52 ng/L for C3.
  • Demonstrated strong agreement between the immunonanogold RS assay and immunoturbidimetry, with a correlation coefficient of 0.960 in nonpathologic serum samples.

Conclusions:

  • The immunonanogold catalytic RS assay is highly sensitive and selective for measuring C3 in human serum.
  • This novel technique holds potential for the diagnosis of C3-related diseases, including hepatitis.