What is Colloidal Gold?
Colloidal gold refers to nanoscale gold particles (typically 20–80 nm) suspended in solution. These particles exhibit a distinct red color due to localized surface plasmon resonance, making them ideal for visual detection systems.
How the Technology Works?
The assay operates through a capillary-driven immunochromatographic process
The sample is applied to the test strip
1
Target analytes (e.g., antigens) bind to gold nanoparticle-labeled antibodies
2
The complex migrates along the membrane
3
4
It is captured at the test line by immobilized antibodies
5
Accumulation of gold nanoparticles produces a visible colored line
Why Colloidal Gold Technology?
Rapid Detection
Results are typically available within minutes, enabling immediate decision-making in clinical and decentralized settings.
Visual Readout (No Equipment Required)
Gold nanoparticles generate an intense color signal, allowing results to be interpreted directly by eye.
Proven & Widely Adopted
Colloidal gold LFIA has been extensively applied in infectious disease diagnostics and field testing due to its simplicity, portability, and robustness.
Ideal for POC & OTC Use
The technology is designed for decentralized healthcare environments, requiring minimal training and no instrumentation.
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