Silica Column
Silica Column - Related Videos
02:59
Extraction of Viral RNA from Surface-Bound Virions Using a Silica Spin Column
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2026
Source: Klaus, J. P. et al. Highly Sensitive Assay for Measurement of Arenavirus-cell Attachment. J. Vis. Exp. (2016)This video demonstrates the extraction of viral RNA from surface-bound virions on epithelial cells using silica spin columns. The method includes chemical lysis, RNA stabilization, and membrane-based purification for downstream quantification of virus-cell attachment.
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...
09:15
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
High-salt, chaotropic conditions make the silica surface favorable for nucleic-acid adsorption. Under these conditions, DNA or RNA binds to the membrane instead of remaining in the liquid phase, while many proteins, lipids, and other sample components do not remain attached. This selective binding creates the separation needed for subsequent washing and recovery.
The membrane provides selective retention rather than nonspecific capture of every sample component. In the binding environment, nucleic acids adsorb to silica, whereas proteins, lipids, and other contaminants are more likely to pass through. This difference in surface interaction allows the column to enrich DNA or RNA before the purification proceeds to washing and elution.
Washing removes impurities that remain after the sample has contacted the membrane. Although DNA or RNA stays associated with the silica under the binding conditions, remaining proteins, lipids, and other contaminants can be cleared before recovery. Effective washing therefore improves the cleanliness of the nucleic-acid preparation and supports reliable use in later molecular-biology analyses.
The workflow first places the biological sample under high-salt, chaotropic conditions so DNA or RNA can bind to the silica membrane. Material that does not bind passes through, and wash steps remove residual impurities. Finally, a low-salt buffer or water releases the purified nucleic acid from the membrane for collection and downstream analysis.
Researchers can use this approach when they need a rapid, reproducible way to prepare nucleic acids from biological samples, particularly when sample volumes are small. The resulting preparations are compatible with PCR, sequencing, cloning, and gene-expression analysis. Its broad utility comes from combining selective purification with a workflow suited to common laboratory and diagnostic procedures.
Purified DNA or RNA can provide input for several forms of molecular analysis, including amplification by PCR, sequencing, cloning, and gene-expression analysis. The column separates nucleic acids from proteins, lipids, and other contaminants before those applications are performed. Consequently, the extraction step helps produce a cleaner starting material for interpreting biological samples.