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Flow Cytometry

Flow Cytometry

The development of flow cytometry techniques began in 1934 with initial attempts by Andrew Moldavan, a bacteriologist who counted the cells in a flowing capillary system. Moldavan pumped cells through a capillary tube focused under a microscope for visualization. The invention of photometry allowed the measurement of differentially-stained cells, and Louis Kamentsky developed the first multiparameter flow cytometer in 1965 to identify and count the cancer cells in cervical tissue specimens.
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Related Experiment Video

Updated: Jun 16, 2026

Standardization of a Cytometric Bead Assay Based on Egg-Yolk Antibodies

Standardization of a Cytometric Bead Assay Based on Egg-Yolk Antibodies

Published on: May 19, 2023

Empirically optimized flow cytometric immunoassay validates ambient analyte theory.

Zaheer A Parpia¹, David M Kelso

¹Department of Biomedical Engineering, Northwestern University, Evanston, IL 60208, USA.

Analytical Biochemistry

|February 16, 2010

Summary

This summary is machine-generated.

Ekins' ambient analyte theory was validated, showing that reducing capture antibody improves immunoassay detection limits. Assays in ambient analyte conditions demonstrated enhanced performance, unaffected by sample volume or antibody levels.

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Area of Science:

Biochemistry
Analytical Chemistry
Immunology

Background:

Immunoassay performance is crucial for diagnostics.
Ekins' ambient analyte theory proposes counterintuitive strategies for improving immunoassay sensitivity.
Empirical validation of this theory is needed.

Purpose of the Study:

To empirically validate the performance characteristics predicted by Ekins' ambient analyte theory.
To compare ambient and nonambient immunoassays regarding signal strength and detection limits.
To assess assay sensitivity to reaction volume and capture antibody concentration.

Main Methods:

Flow cytometric analysis was employed to measure fractional occupancy.
Ambient analyte conditions were experimentally determined.
Comparisons were made between ambient and nonambient assay formats.

Main Results:

Ambient analyte assays demonstrated superior signal/noise ratios.
Lower limits of detection were achieved in ambient analyte assays.
Assays operating under ambient analyte conditions were insensitive to variations in sample volume and binding site number.

Conclusions:

Ambient analyte theory provides an excellent framework for developing high-performance immunoassays.
Fractional occupancy is a key response variable for ambient analyte theory.
Reducing capture antibody can enhance immunoassay limit of detection.