Flash Chromatography
Flash Chromatography - Related Videos
09:23
Column Chromatography
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2023
Source: Laboratory of Dr. Jimmy Franco - Merrimack College Column chromatography is one of the most useful techniques for purifying compounds. This technique utilizes a stationary phase, which is packed in a column, and a mobile phase that passes through the column. This technique exploits the differences in polarity between compounds, allowing the molecules to be facilely separated.1 The two most common stationary phases for column chromatography are silica gel (SiO2) and alumina (Al2O3), with...
10:32
Thermal Diffusivity and the Laser Flash Method
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2023
Source: Elise S.D. Buki, Danielle N. Beatty, and Taylor D. Sparks, Department of Materials Science and Engineering, The University of Utah, Salt Lake City, UT The laser flash method (LFA) is a technique used to measure thermal diffusivity, a material specific property. Thermal diffusivity (α) is the ratio of how much heat is conducted relative to how much heat is stored in a material. It is related to thermal conductivity (), how much heat is transferred through a material due to a temperature...
28:32
Flash Freezing and Cryosectioning E12.5 Mouse Brain
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Cited by 6 •
2007
Demonstrated in this video are the techniques for flash freezing and sectioning embryonic brain tissue from mouse. Useful tips for using the cryostat are given, including troubleshooting methods that can be used while cutting to ensure that the resultant tissues sections are free of cracks and other distortions.
11:35
Flash Photolysis of Caged Compounds in the Cilia of Olfactory Sensory Neurons
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Cited by 8 •
2011
Photolysis of caged compounds allows the production of rapid and localized increases in the concentration of various physiologically active compounds. Here, we show how to obtain patch-clamp recordings combined with photolysis of caged cAMP or caged Ca for the study of olfactory transduction in dissociated mouse olfactory sensory neurons.
08:52
Ion-Exchange Chromatography
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2023
Source: Laboratory of Dr. B. Jill Venton - University of Virginia Ion-exchange chromatography is a type of chromatography that separates analytes based on charge. A column is used that is filled with a charged stationary phase on a solid support, called an ion-exchange resin. Strong cation-exchange chromatography preferentially separates out cations by using a negatively-charged resin while strong anion-exchange chromatography preferentially selects out anions by using a positively-charged...
FAQs
Separation depends on how strongly each compound interacts with the packed stationary phase, commonly silica gel, compared with how readily it dissolves in the mobile solvent. Compounds with different balances of these interactions travel at different rates. This difference in movement allows components that began in one mixture to emerge at separate times.
The mobile solvent carries compounds through the column, but compounds do not necessarily move with it at the same rate. Their movement reflects both how well they dissolve in the solvent and how they interact with the stationary phase. Consequently, differences in solvent compatibility contribute directly to the spacing of eluted components.
Fractions provide separate portions of the material as components leave the column. Analyzing these portions helps determine which contain the desired compound and whether the collected material is sufficiently pure. This assessment links the physical separation to a practical purification outcome, allowing isolated material to be selected for characterization or further chemical work.
A typical workflow packs the column with stationary material, introduces the chemical mixture, and pushes solvent through the packed bed under pressure. As components elute, the output is divided into individual fractions. Those fractions are then analyzed to evaluate separation and identify the portions appropriate for collection or subsequent use.
Chemists can apply the technique after a reaction to clean up the resulting mixture, during isolation of compounds from natural materials, or when preparing purified intermediates. In each case, its value lies in converting a mixed sample into separated fractions that can support structural characterization, synthesis, or further study.
Purified fractions can provide material for structural characterization and for additional synthetic steps. The method is therefore useful beyond simple mixture separation: it helps prepare cleaner intermediates and isolated compounds for continued investigation. In natural-product work, it also supports the recovery of individual components from more complex chemical mixtures.