Small-scale Fractionation
Small-scale Fractionation - Related Videos
10:56
Polysome Fractionation and Analysis of Mammalian Translatomes on a Genome-wide Scale
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Cited by 217 •
2014
Ribosomes play a central role in protein synthesis. Polyribosome (polysome) fractionation by sucrose density gradient centrifugation allows direct determination of translation efficiencies of individual mRNAs on a genome-wide scale. In addition, this method can be used for biochemical analysis of ribosome- and polysome-associated factors such as chaperones and signaling molecules.
10:09
Fractional Distillation
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2023
Source: Laboratory of Dr. Nicholas Leadbeater — University of Connecticut Distillation is perhaps the most common laboratory technique employed by chemists for the purification of organic liquids. Compounds in a mixture with different boiling points separate into individual components when the mixture is carefully distilled. The two main types of distillation are "simple distillation" and "fractional distillation", and both are widely used in organic chemistry laboratories. Simple distillation...
02:41
pH Scale
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2020
Hydronium and hydroxide ions are present both in pure water and in all aqueous solutions, and their concentrations are inversely proportional as determined by the ion product of water (Kw). The concentrations of these ions in a solution are often critical determinants of the solution’s properties and the chemical behaviors of its other solutes. Two different solutions can differ in their hydronium or hydroxide ion concentrations by a million, billion, or even trillion times. A common means of...
07:57
Using the GELFREE 8100 Fractionation System for Molecular Weight-Based Fractionation with Liquid Phase Recovery
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Cited by 17 •
2009
The accompanying video describes the use of the GELFREE 8100 Fractionation System, which partitions complex protein samples on the basis of molecular weight and recovers the fractions in liquid phase. The video describes how the technology works, how it is used, and provides resultant data, with polyacrylamide gel electrophoresis analysis of fractionated bovine liver homogenate.
04:25
Preparation of Subcellular Fractions from Leukemic Cells: A Method to Generate Cellular and Nuclear Fractions from Leukemic Cells
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2023
This video describes the preparation of subcellular fractions from leukemic cells which is a method to generate cellular and nuclear fractions from leukemic cells. The nuclear and cytoplasmic fractions can be used for further downstream analysis.
FAQs
Sequential centrifugation separates released material by differences in size and density. The resulting fractions can be collected at successive stages, allowing nuclei, membranes, synaptic material, and soluble components to be examined separately. This reduces the complexity of the original brain-tissue sample and helps associate measured molecules with particular cellular compartments.
Gentle homogenization releases cellular components from the tissue before centrifugation. In a small brain sample, this initial disruption makes material available for subsequent separation while connecting physical tissue handling to the fractions ultimately produced. The quality and consistency of this step therefore influence how clearly nuclear, membrane, synaptic, and soluble components can be analyzed.
Small-scale Fractionation can show whether a protein, receptor, enzyme, or signaling molecule is associated with a particular fraction. Researchers can examine the separated material using biochemical, molecular, or imaging assays. Comparing results across fractions provides evidence about subcellular location and organization, including distributions relevant to synaptic material and neuronal signaling in complex brain tissue.
A practical workflow starts with a small tissue sample, followed by gentle homogenization to release cellular components. The homogenate then undergoes sequential centrifugation steps that generate fractions associated with nuclei, membranes, synaptic material, and soluble components. Each fraction can subsequently be directed to a biochemical, molecular, or imaging assay, depending on the localization question under investigation.
The method is especially useful when researchers have limited biological material but need information about components within complex tissue such as the brain. Separating a small sample into multiple fractions supports analysis of cellular responses, neuronal signaling, and synaptic organization without treating all tissue contents as a single mixture. This makes it suitable for studies where sample availability is constrained.
Analyzing separate fractions can help researchers examine disease-associated changes in the distribution of proteins, receptors, enzymes, or signaling molecules. The same strategy supports studies of synaptic organization and neuronal signaling by linking assay results to membrane, synaptic, soluble, or other cellular fractions. These outcomes provide biochemical or molecular context for changes observed in brain tissue.