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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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Asymmetrical Flow Field-Flow Fractionation for Sizing of Gold Nanoparticles in Suspension

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Flow field-flow fractionation: a pre-analytical method for proteomics.

Pierluigi Reschiglian¹, Myeong Hee Moon

¹Department of Chemistry G. Ciamician, University of Bologna, Via Selmi 2, Bologna, Italy.

Journal of Proteomics

|July 8, 2008

Summary

Flow Field-Flow Fractionation (F4) offers advanced protein separation for proteomics without surface interactions. This technique complements mass spectrometry (MS) for analyzing low-level proteins and improving proteome characterization.

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Area of Science:

Proteomics
Analytical Chemistry
Biochemistry

Background:

Proteome analysis demands advanced separation techniques to characterize complex biological mixtures.
Mass spectrometry (MS) has improved biomolecule characterization, but effective pre-MS protein/peptide separation remains crucial.
Identifying low-abundance proteins necessitates high-performance separation, isolation, and purification methods.

Purpose of the Study:

To introduce Flow Field-Flow Fractionation (F4) as a complementary pre-analytical separation technique for proteomic research.
To highlight F4's advantages over existing separation methods for protein isolation and purification.
To review F4 applications in size-dependent proteome separation and its hyphenation with MS and other techniques.

Main Methods:

Flow Field-Flow Fractionation (F4) separates macromolecules based on diffusion coefficients and hydrodynamic size in an open channel.
Separation is driven by a secondary flow perpendicular to the primary mobile phase flow, avoiding surface interactions.
F4 is utilized for on-line or off-line coupling with mass spectrometry (MS) techniques like electrospray ionization (ESI) and matrix-assisted laser desorption-ionization (MALDI).

Main Results:

F4 provides bio-friendly protein separation without altering structural configurations.
Proteins are fractionated based on size/shape and can be collected for subsequent analysis.
F4 demonstrates advantages over conventional separation techniques for proteomic applications.

Conclusions:

Flow Field-Flow Fractionation (F4) is a valuable tool for protein separation and isolation in proteomics.
F4's ability to maintain protein integrity and its compatibility with MS enhance proteomic analysis.
Hyphenation of F4 with MS and capillary isoelectric focusing (CIEF) offers new avenues for comprehensive proteome studies.