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Immunogold Electron Microscopy

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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Related Experiment Video

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Sensing of Barrier Tissue Disruption with an Organic Electrochemical Transistor

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Electrical immunosensor based on a submicron-gap interdigitated electrode and gold enhancement.

Junhyoung Ahn¹, Tae Han Lee, Taihua Li

¹BioMonitoring Research Center, KRIBB, Daejeon 305-806, Republic of Korea. ajh@kribb.re.kr

Biosensors & Bioelectronics

|June 21, 2011

Summary

This study presents a novel immunoassay for detecting human interleukin 5 (IL5) using gold nanoparticle-enhanced interdigitated electrodes (IDEs). This method achieves higher sensitivity than ELISA for IL5 detection.

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Area of Science:

Biosensors and bioelectronics
Nanotechnology in diagnostics
Immunochemical assays

Background:

Enzyme-linked immunosorbent assay (ELISA) is a common method for detecting biomarkers like human interleukin 5 (IL5).
There is a need for more sensitive and miniaturized diagnostic tools for IL5 detection.
Interdigitated electrodes (IDEs) offer a platform for simple and mass-producible electrochemical biosensors.

Purpose of the Study:

To develop a highly sensitive immunoassay for human IL5 detection.
To utilize submicron-gap interdigitated electrodes (IDEs) with gold nanoparticle (AuNP) amplification for enhanced signal detection.
To compare the sensitivity of the developed IDE-based assay with traditional ELISA methods.

Main Methods:

Fabrication of submicron-gap (400nm) IDEs using stepper photolithography.
Immobilization of biotinylated anti-human IL5 antibody onto a streptavidin-modified IDE surface.
Application of a sandwich immunoassay protocol involving AuNP-conjugated antibodies and a critical gold enhancement step for signal amplification.

Main Results:

The gold enhancement step was identified as crucial for amplifying the electrical signal.
Scanning electron microscopy (SEM) confirmed the formation of approximately 1μm particles from 10nm AuNPs after gold enhancement.
The developed IDE-based immunoassay detected human IL5 with a sensitivity of 1 pg/mL over a wide dynamic range (10^-3 to 100 ng/mL).

Conclusions:

Mass-producible submicron-gap IDEs combined with AuNP signal amplification provide a highly sensitive platform for IL5 detection.
This novel approach surpasses the sensitivity of conventional ELISA for human IL5.
The developed biosensor demonstrates potential for miniaturized and efficient immunoassays.