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<p><b>New page</b></p><div>[[File:Saccharose-Epichlorhydrin-Copolymer_Komponenten.svg|Saccharose-Epichlorhydrin-Copolymer Komponenten|thumb]] '''Ficoll''' is a synthetic, high-molecular-weight [[polysaccharide]] that is widely used in the laboratory for the separation of biological molecules and cells. It is a neutral, highly branched polymer typically composed of sucrose and epichlorohydrin. Due to its properties, Ficoll is particularly useful in the creation of density gradients, which are employed in the purification and separation of cells, viruses, and other subcellular components.<br />
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==Properties and Uses==<br />
Ficoll's high molecular weight and inert nature make it an ideal medium for density gradient centrifugation. It is soluble in water and can form highly viscous solutions, which do not interfere with cell viability or function. This makes it especially valuable in the separation of blood components, such as the isolation of lymphocytes from peripheral blood or bone marrow.<br />
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One of the most common applications of Ficoll is in the preparation of Ficoll-Paque, a solution used for the isolation of mononuclear cells from blood. This process involves layering blood over a Ficoll-Paque solution and centrifuging it. The different components of the blood separate into layers based on their density, with the mononuclear cells forming a distinct band at the interface between the plasma and the Ficoll-Paque solution. This method is critical in immunology and other biomedical research fields for obtaining pure cell populations for further analysis.<br />
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==Advantages==<br />
The use of Ficoll in cell separation offers several advantages:<br />
* It is non-toxic to cells, allowing for the recovery of viable cells after separation.<br />
* It provides a clear separation of cells based on density, facilitating the isolation of specific cell types.<br />
* It is versatile and can be used with a variety of biological samples, including blood, bone marrow, and cultured cells.<br />
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==Limitations==<br />
While Ficoll is widely used and highly effective for certain applications, it does have limitations:<br />
* It may not be suitable for the separation of cells with very similar densities.<br />
* The high viscosity of Ficoll solutions can make handling and pipetting challenging, requiring careful technique.<br />
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==Conclusion==<br />
Ficoll remains a staple in laboratories for the separation and purification of cells and biological molecules. Its ability to create stable density gradients, combined with its inertness and compatibility with biological samples, makes it an invaluable tool in biomedical research.<br />
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[[Category:Polysaccharides]]<br />
[[Category:Laboratory techniques]]<br />
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