Gel Chromatography
Gel Chromatography - Related Videos
01:10
Silica Gel Column Chromatography: Overview
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2024
Silica gel column chromatography is a technique for separating compounds using a column packed with silica gel as the stationary phase. This method relies on differences in the polarity of compounds. Based on their polarities, compounds move between the stationary phase (silica gel) and the mobile phase (the solvent), forming discrete bands in the column. Polar components tend to bind strongly to the silica gel, causing them to move slowly through the column. In contrast, nonpolar compounds...
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...
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...
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...
03:07
Thin-Layer Chromatography - Concepts
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2020
Chromatography Chromatography is a technique used in organic chemistry to separate compounds in a mixture based on their differences in solubility between two different phases. The concept is similar to liquid-liquid extraction, except in chromatography, the two phases consist of the stationary phase and the mobile phase. The stationary phase is a solid — typically a microscale hydrogel bead — while the mobile phase is a carrier solvent. In traditional chromatography, the stationary phase is...
FAQs
Elution order in gel chromatography depends on how much of the gel's internal pore volume a molecule can access. Larger molecules bypass much of this volume, so they take shorter routes through the column and appear earlier. Smaller molecules enter more pores, follow longer pathways, and elute later.
The gel separates molecules through physical access to pore space rather than chemical attachment to the stationary phase. Consequently, the sample can be sorted according to molecular size without requiring molecules to bind to the gel. That property supports purification and characterization when size-based separation is the intended outcome.
The mobile phase transports dissolved molecules through the column, while the packed gel particles provide the stationary structure containing pores. Their interaction creates different travel paths: molecules with greater pore access spend more time within the gel, whereas molecules that bypass pore volume move through more directly. This division controls separation.
A basic separation uses a column packed with porous gel, a dissolved sample, and a mobile phase. The sample enters the column, and the mobile phase carries it through the stationary particles. As molecules travel along different pathways, they elute in size-dependent order, producing a sequence that can support purification or molecular-size analysis.
Elution behavior can indicate relative molecular size and reveal how a sample is distributed across sizes. Molecules appearing earlier have experienced less pore access and therefore correspond to larger sizes, while later molecules have followed longer pore pathways. Engineers can use this pattern for characterization and quality control by examining sample composition and distribution.
In engineering, the method supports polymer molecular-weight analysis, biomolecule purification, and quality control. Polymer samples can be examined for molecular-weight distribution, while biomolecule mixtures can be separated for purification. In quality-control work, the elution pattern reveals sample composition and distribution, providing information about the material being analyzed.