Sucrose Cushion Centrifugation
Sucrose Cushion Centrifugation - Related Videos
03:39
Preparation of Virus-Enriched Suspension Using Stepwise Sucrose Centrifugation
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2026
Source: Vijayraghavan, S. and Kantor, B. A Protocol for the Production of Integrase-deficient Lentiviral Vectors for CRISPR/Cas9-mediated Gene Knockout in Dividing Cells. J. Vis. Exp., (2017)This video demonstrates a two-step ultracentrifugation method using sucrose gradients and cushions to purify and concentrate viral particles from cell culture supernatant. The procedure enables separation based on buoyant density, allowing recovery of intact virus suitable for downstream applications.
04:11
Exosome Isolation: A Density-based Ultracentrifugation Technique Using Sucrose Cushion to Separate Exosomes from Conditioned Media of Cultured Cells
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2023
This video describes a density-based ultracentrifugation technique for isolating exosomes from conditioned media harvested from human embryonic kidney cell cultures using a 25% (w/w) sucrose cushion prepared in deuterium oxide. The isolated exosomes can be used for downstream applications.
11:00
Liquid Phase Reactor: Sucrose Inversion
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2023
Source: Kerry M. Dooley and Michael G. Benton, Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA Both batch and continuous flow reactors are used in catalytic reactions. Packed beds, which use solid catalysts and a continuous flow, are the most common configuration. In the absence of an extensive recycle stream, such packed bed reactors are typically modeled as "plug flow". The other most common continuous reactor is a stirred tank, which is assumed to be perfectly...
03:36
Purification of Bacteriophages Using a Sucrose Density Gradient
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2026
Source: Rustad, M., et.al. Synthesis of Infectious Bacteriophages in an E. coli-based Cell-free Expression System. J. Vis. Exp. (2017)This video demonstrates the purification of bacteriophages from a suspension containing host bacterial debris using a sucrose density gradient. It shows how the density gradient separates phages by buoyant density, enabling recovery of a visible band for resuspension and further analysis.
07:07
Working with Centrifuges
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2023
Source: Robert M. Rioux & Suprita Jharimune, Pennsylvania State University, University Park, PA Earth's gravitational force is capable of separating heterogeneous mixtures. However, many systems avert this type of separation owing to the length of time usually required in such cases. Centrifugation is one of the most powerful tools for the separation of heterogeneous mixtures1. It involves the application of centripetal force for sedimentation of the heavier phase, leading to separation of...
FAQs
Particle movement through the sucrose layer depends on sedimentation properties, which describe how biological particles respond to centrifugal force. Particles therefore do not all travel through the cushion at the same rate or to the same position. This behavior allows complex samples to be separated into enriched fractions containing different particles, including viruses, ribosomes, membranes, or organelles.
The concentrated sucrose layer acts as a dense collection zone beneath the sample. As particles move under centrifugal force, the cushion helps concentrate the desired material and limits the passage or mixing of smaller unwanted components. This improves the consistency of the recovered fraction and supports later biochemical, microscopic, molecular, or structural analysis.
The outcome is influenced mainly by the sedimentation properties of the particles and by the centrifugal force applied to the sample. These factors determine how readily particles move through the cushion and where enriched material is collected. Differences among viruses, ribosomes, membranes, and organelles can therefore affect the composition and concentration of the resulting fractions.
Sucrose cushion centrifugation can provide relatively gentle separation conditions while still concentrating biological particles. Preserving particle integrity matters when the recovered material must remain suitable for microscopy, molecular assays, biochemical analysis, or structural studies. The approach is therefore useful when researchers need both improved sample concentration and material that remains sufficiently intact for downstream investigation.
A basic workflow begins by preparing a complex biological sample and layering it over a concentrated sucrose solution. The assembly is then exposed to high centrifugal force so particles move through the cushion according to their sedimentation properties. After centrifugation, researchers recover the enriched target fraction for subsequent biochemical, microscopic, molecular, or structural examination.
The recovered fraction provides a more concentrated and consistent source of the target biological material than the original complex sample. Researchers can use this enriched material for biochemical analysis, microscopy, molecular assays, or structural studies. The specific value depends on whether the experiment requires characterization of viruses, ribosomes, membranes, organelles, or another particle fraction.
Researchers may choose this method when a sample contains biological particles that need enrichment or purification before analysis. It is especially relevant for work involving viruses, ribosomes, membranes, and organelles, where concentration can improve experimental consistency. Its relatively gentle conditions also make it suitable when maintaining particle integrity is important for subsequent measurements.
The approach can enrich several classes of biological particles, including viruses, ribosomes, membranes, and organelles. Because these materials differ in their sedimentation behavior, the recovered fraction can be directed toward different biological questions. Enriched material may then support microscopy, biochemical characterization, molecular testing, or structural investigation within biology research.