Capillary Column
Capillary Column - Related Videos
13:36
Simple In-House Ultra-High Performance Capillary Column Manufacturing with the FlashPack Approach
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Cited by 3 •
2021
Here we present a protocol for the optimized FlashPack capillary column packing procedure. Application of an optimized protocol to a common 100-bar pressure bomb setup allows 10-times faster packing and manufacturing of long ultra-high performance capillary columns.
08:50
Capillary Electrophoresis (CE)
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2023
Source: Laboratory of Dr. B. Jill Venton - University of Virginia Capillary electrophoresis (CE) is a separation technique that separates molecules in an electric field according to size and charge. CE is performed in a small glass tube called a capillary that is filled with an electrolyte solution. Analytes are separated due to differences in electrophoretic mobility, which varies with charge, solvent viscosity, and size. Traditional electrophoresis in gels is limited in the amount of voltage...
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...
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...
03:07
Column Chromatography - Concepts
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2020
Column Chromatography Multiple techniques exist to purify and separate compounds in an organic chemistry laboratory. One of the most reliable separation techniques for microscale separations, where less than 10 grams of the compound is available for analysis, is column chromatography. This technique separates compounds in a mixture based on their physical properties, such as their solubility, polarity, hydrophobicity, size, and charge. Chromatography Basics The main components of any...
FAQs
The stationary phase provides the surface with which vaporized compounds interact as the carrier gas moves them through the column. Each compound partitions differently between the gas phase and this coating, so some remain associated with the stationary phase longer than others. These differences change how quickly compounds travel and produce separate retention times for analysis.
Capillary columns are designed to provide high separation efficiency within a narrow-bore format. This efficiency allows components with different partitioning behavior to produce distinct signals even when the mixture contains many compounds. Because the method can resolve components from small sample amounts, it is useful when only limited material is available for chemical analysis.
A retention time records how long a compound takes to pass through the column under the selected analytical conditions. Differences between compounds reflect their unequal partitioning between the mobile carrier gas and the stationary phase. Comparing the resulting retention pattern supports qualitative identification, while measured component responses can contribute to quantitative analysis.
The sample is first vaporized so its components can enter the column in the gas phase. An inert carrier gas then transports the vapor through the stationary-phase coating, where components separate according to their partitioning behavior. The resulting retention times distinguish the separated compounds and provide the basis for analyzing the mixture.
The approach is suited to compounds that can be vaporized and remain thermally stable during analysis. This includes many solvents, environmental contaminants, pharmaceuticals, and other volatile substances identified in chemistry applications. Compounds that do not meet the volatility or thermal-stability requirements may not be appropriate for this type of column-based gas chromatographic analysis.
Chemists use capillary columns to separate mixture components before qualitative identification or quantitative measurement. Applications described for the technique include examining solvents, environmental contaminants, pharmaceuticals, and other volatile or thermally stable compounds. The high separation efficiency is especially valuable when complex samples must be resolved while conserving the amount of material analyzed.