Chromatographic Column
Chromatographic Column - Related Videos
09:13
Chromatographic Purification of Highly Active Yeast Ribosomes
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Cited by 7 •
2011
Contamination of preparations of eukaryotic ribosomes purified by traditional methods by co-purifying nucleases and proteases negatively impacts on downstream biochemical and structural analyses. A rapid and simple chromatographic purification method is used to solve this problem using yeast ribosomes as a model system.
09:15
Column Chromatography - Student Protocol
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2020
Source: Lara Al Hariri and Ahmed Basabrain at the University of Massachusetts Amherst, MA, USA Column Chromatography of Food DyeExpand In this experiment, you'll use column chromatography to separate green food coloring into its component blue and yellow dyes, called erioglaucine and tartrazine. First, you'll use 95% ethanol to elute the dye with a weaker affinity for silica gel. Then, you'll flush the second dye from the column with water. To recover the purified dyes, you will collect each...
01:15
Chromatographic Resolution
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2024
In chromatography, a solute moves through a chromatographic column and tends to spread, forming a Gaussian-shaped band. The longer the solute spends in the column, the broader the band becomes. The broadening can lead to overlaps within the column, affecting separation effectiveness. The effectiveness of separation can be evaluated by determining the level of separation between two neighboring peaks in a chromatogram, which represents the individual components of a sample. In chromatography,...
01:18
Chromatographic Methods: Terminology
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2024
Chromatography is an analytical technique widely used in fields such as chemistry, biology, environmental science, and pharmaceuticals to separate the components of a mixture and identify substances between them. The process of chromatography is based on the interactions between two distinct phases: the stationary phase and the mobile phase. The stationary phase is fixed in place by a supporting material, while the mobile phase moves over it, carrying the solutes. As the mobile phase travels,...
01:12
Chromatographic Methods: Classification
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2024
Chromatographic techniques are classified in three ways: the classification is based on the physical state of the stationary and mobile phases, how the mobile phase and the stationary phase contact each other, or through the chemical or physical processes that isolate the components of the sample. Typically, the mobile phase is either a liquid or gas, while the stationary phase is either a solid or a liquid layer applied to a solid surface. Chromatographic techniques are typically named by...
FAQs
Separation depends on how strongly each component interacts with the packed stationary phase compared with the mobile phase. Components that differ in size, charge, polarity, or affinity therefore migrate at different rates. This differential movement allows a mixture to resolve into distinct fractions, even when its components travel through the same column under the same overall conditions.
The packed material is chosen according to the property that best distinguishes the mixture’s components. Silica, resin, or gel can provide a stationary environment suited to differences in polarity, charge, size, or affinity. Selecting a material that emphasizes the relevant difference improves the separation and supports more effective isolation of the desired chemical or biological component.
Each component spends a different proportion of its movement associated with the stationary phase or the mobile phase. That difference changes its migration rate through the packed material, so components leave the column at different points during the separation. Collecting the resulting fractions preserves these differences for later analysis or purification.
A sample is introduced onto the packed stationary phase, and a mobile phase carries its components through the column. Because the components migrate at different rates, the material leaving the column is collected as separate fractions. Those fractions can then be examined to determine where the desired compound or biomolecule has been separated from other mixture components.
They are useful when researchers need to isolate or purify biological materials from mixtures, including proteins, nucleic acids, metabolites, and other biomolecules. The separation can remove contaminants and produce fractions enriched in particular components. These purified or partially purified materials can then support biochemical characterization, assay development, or preparation for subsequent research.
Fractions reveal how the mixture’s components behave relative to the selected stationary and mobile phases. Their distribution across the collected portions can indicate whether components have separated and which portions contain material of interest. In biological research, the fractions provide starting materials for biochemical characterization, assay development, and preparation of purified substances.