Dextran Centrifugation
Dextran Centrifugation - Related Videos
07:07
Working with Centrifuges
0 Views •
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...
12:00
Preparation and Characterization of SDF-1α-Chitosan-Dextran Sulfate Nanoparticles
0 Views •
Cited by 9 •
2015
The objective of this protocol is to incorporate SDF-1α, a stem cell homing factor, into dextran sulfate-chitosan nanoparticles. The resultant particles are measured for their size and zeta potential, as well as the content, activity, and in vitro release rate of SDF-1α from the nanoparticles.
01:05
Centrifugation
0 Views •
2024
Centrifugation is a separation technique based on differences in density or size. It is commonly used to separate solids from aqueous interferents. During centrifugation, the sample is placed in centrifugation tubes and spun at high angular velocity, which allows centrifugal force to act differentially on the different densities or masses of the components. After spinning, the supernatant liquid is decanted. Depending on the specific application, either the pellet or the supernatant is retained...
07:52
An Introduction to the Centrifuge
0 Views •
2023
The centrifuge is an instrument used in nearly every research lab across the globe. Centrifugation is the process by which a centrifuge is used to separate components of a complex mixture. By spinning laboratory samples at very high speeds, the components of a given mixture are subjected to centrifugal force, which causes more dense particles to migrate away from the axis of rotation and lighter ones to move toward it. These particles can sediment at the bottom of the tube into what’s...
02:56
FITC-Dextran Feeding: A Method to Quantify Intestinal Permeability in C. elegans
0 Views •
2023
This video introduces a method of to visualize and measure the integrity of the C. elegans intestine lumen by feeding worms FITC-labeled dextran. The example protocol shows the assay done with 3,3’-diindolylmethane (DIM)-treated and pathogen-fed worms.
FAQs
These properties influence how cells and particles move during centrifugation. Differences in density affect where material accumulates, while size and settling behavior influence the rate and position of movement through the dextran-containing medium. As a result, a heterogeneous sample can produce layers or pellets containing different combinations of cells, debris, and soluble material.
The medium provides the environment in which cellular populations and other sample components respond differently to centrifugal force. Its use together with controlled centrifugation helps make differences in settling behavior observable as separated layers or pellets. This supports recovery of fractions with improved consistency while helping researchers maintain conditions that are compatible with cell viability.
Centrifugation conditions must be controlled because the separation is intended to distinguish populations without unnecessarily compromising cellular viability. Consistent handling helps produce more reproducible layers or pellets and reduces variation between samples. In neuroscience experiments, this matters because viable, consistently enriched neural, glial, or vascular fractions are more suitable for downstream culture, imaging, flow cytometry, and molecular analysis.
A general workflow places the heterogeneous biological sample in dextran-containing media, applies centrifugal force under controlled conditions, and then distinguishes the resulting layers or pellets. The separated fractions can subsequently be used for analysis or further experimental work. Careful control of the process supports more consistent fractionation and helps preserve the usefulness of recovered cellular material.
Researchers may select Dextran centrifugation when a brain-derived sample contains mixed cellular populations, debris, and soluble material that need to be fractionated before analysis. The approach can help enrich neural, glial, or vascular cells for culture, imaging, flow cytometry, or molecular studies. Enrichment is especially valuable when sample composition could otherwise reduce the reliability of downstream measurements.
Separated and enriched fractions can support investigations of nervous-system structure, cellular interactions, and disease-related changes. Their value comes from improving sample purity and consistency before downstream measurements, rather than from separation alone. Depending on the selected fraction and assay, researchers can examine cellular features through imaging, maintain cells in culture, or perform flow-cytometric and molecular analyses.