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Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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Flow induced dispersion analysis rapidly quantifies proteins in human plasma samples.

Nicklas N Poulsen1, Nina Z Andersen, Jesper Østergaard

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A novel Flow Induced Dispersion Analysis (FIDA) method rapidly quantifies protein biomarkers and drugs by measuring changes in molecular diffusivity. This technique offers a faster, simpler alternative to ELISA for diagnostics and drug development.

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Area of Science:

  • Biomarker quantification
  • Assay development
  • Analytical chemistry

Background:

  • Current protein quantification methods like ELISA are slow, require large samples, and involve complex assay development.
  • Accurate and rapid quantification of protein biomarkers and drugs is crucial for diagnostics and biopharmaceutical research.

Purpose of the Study:

  • To introduce and validate a new quantification approach based on diffusivity changes.
  • To demonstrate the speed, selectivity, and simplicity of the FIDA assay.

Main Methods:

  • Utilizing Taylor Dispersion Analysis (TDA) in a hydrodynamic flow system to measure the apparent diffusivity of an indicator molecule.
  • Quantifying analytes by detecting changes in indicator diffusivity caused by complexation with the target protein.

Main Results:

  • The new method, Flow Induced Dispersion Analysis (FIDA), provides rapid (minutes) and selective quantification in complex matrices like human plasma.
  • FIDA was successfully demonstrated for quantifying Human Serum Albumin (HSA) and anti-HSA antibodies.
  • Assay sensitivity can reach the sub-nanomolar to picomolar range for antibody-antigen interactions.

Conclusions:

  • FIDA offers a fast, automated, and straightforward assay development process for protein quantification.
  • This technique presents a significant advancement over traditional methods for biomarker and drug analysis.
  • The sensitivity and applicability of FIDA hold promise for improving diagnostic and drug development workflows.