Percoll Gradient Separation
Percoll Gradient Separation - Related Videos
09:58
Isolation of Brain and Spinal Cord Mononuclear Cells Using Percoll Gradients
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Cited by 133 •
2011
The current article describes a rapid protocol to efficiently isolate mononuclear cells from brain and spinal cord tissues that can be effectively utilized for flow cytometric analyses.
08:30
Preparation of Synaptoneurosomes from Mouse Cortex using a Discontinuous Percoll-Sucrose Density Gradient
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Cited by 43 •
2011
A method to prepare translationally active, intact synaptoneurosomes (SNs) from mouse brain cortex is described. The method uses a discontinuous Percoll-sucrose density gradient allowing for the quick preparation of active SNs.
02:17
Separation of Bacteria by Capsule Amount Using a Discontinuous Density Gradient
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2025
Source: Feltwell, T., et.al. Separating Bacteria by Capsule Amount Using a Discontinuous Density Gradient. J. Vis. Exp. (2019)This video demonstrates the use of a discontinuous density gradient to separate bacterial strains based on capsule amount. By centrifuging a transposon mutant library through the gradient, bacteria with different capsule densities localize to distinct layers. The separated fractions can then be collected for downstream analysis.
07:11
Isolation of Infiltrating Leukocytes from Mouse Skin Using Enzymatic Digest and Gradient Separation
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Cited by 33 •
2016
This protocol describes enzymatic digestion of mouse skin in nutrient-rich medium followed by gradient separation to isolate leukocytes. Cells thus derived can be used for diverse downstream applications. This is an effective, economical, and improved alternative to tissue dissociation machines and harsher trypsin and dispase-based tissue digestion protocols.
05:52
Separating Bacteria by Capsule Amount Using a Discontinuous Density Gradient
0 Views •
Cited by 13 •
2019
We demonstrate the use of discontinuous density gradients to separate bacterial populations based on capsule production. This method is used to compare capsule amount between cultures, isolate mutants with a specific capsule phenotype, or to identify capsule regulators. Described here is the optimization and running of the assay.
FAQs
During centrifugation, particles travel through the Percoll gradient until the density of the surrounding medium matches their buoyant density. Particles with different buoyant densities therefore stabilize at different positions, producing separated bands. This mechanism allows researchers to distinguish and recover biological populations based on physical density rather than treating the sample as a single mixture.
Percoll combines colloidal silica with a polyvinylpyrrolidone coating to create the medium used for gradient separation. Under centrifugation, this material forms the density environment through which cells, organelles, or other particles migrate. The resulting gradient supports distinct band formation while contributing to the method’s relatively gentle handling of biological structures.
Buoyant density determines the position a particle reaches within the gradient, so small differences among biological components can produce separate bands. This density-dependent organization is central to the method’s high-resolution separation. Clearer bands make it easier to distinguish fractions and select material for later analysis, culture, or functional testing.
A sample is subjected to centrifugation in a Percoll-based density environment, allowing its components to migrate into distinct positions. After band formation, researchers collect the separated fractions for downstream work. The recovered material may then be examined analytically, placed into culture, or evaluated in functional assays, depending on the biological question.
This approach is useful when a biological sample contains cells, organelles, or other particles that need to be separated by buoyant density. Its relatively gentle nature and good preservation of cellular structure and viability make it suitable for studies where recovered material must remain useful for subsequent analysis, culture, or functional assays.
Percoll Gradient Separation supports work in cell biology, immunology, developmental biology, and tissue research. In these settings, researchers can isolate density-defined fractions and examine them separately rather than analyzing a mixed sample. The method therefore helps connect physical separation with downstream studies of cellular properties, tissue components, or biological function.