Online Column Extraction
Online Column Extraction - Related Videos
09:18
Purification of a Total Lipid Extract with Column Chromatography
0 Views •
2023
Source: Laboratory of Jeff Salacup - University of Massachusetts Amherst The product of an organic solvent extraction, a total lipid extract (TLE), is often a complex mixture of hundreds, if not thousands, of different compounds. The researcher is often only interested in a handful of compounds. The compounds of interest may belong to one of several classes of compounds, such as alkanes, ketones, alcohols, or acids (Figure 1), and it may be useful to remove the compound classes to which it does...
07:01
Medium-Throughput Column DNA Extraction Using 24-Well Racks
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2026
This protocol describes a cost-effective method to accelerate plasmid DNA extraction. By utilizing custom 3D-printed racks compatible with standard swinging-bucket plate rotors, researchers can process up to 48 spin columns with caps or up to 116 spin columns without caps simultaneously, significantly reducing handling time compared to manual microcentrifuge methods.
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.
09:44
Methods to Test Visual Attention Online
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Cited by 26 •
2015
To replicate laboratory settings, online data collection methods for visual tasks require tight control over stimulus presentation. We outline methods for the use of a web application to collect performance data on two tests of visual attention.
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...
FAQs
Retention is governed by interactions between the target compounds and the stationary phase in the short extraction column. These interactions hold the analytes while unwanted components from the biological matrix are removed during washing. This selective behavior is important because plasma and urine contain complex mixtures that could interfere with subsequent chromatographic separation and detection.
The valve controls the transition between sample cleanup and analytical separation. After the extraction column retains the target compounds and matrix components have been washed away, the valve redirects those retained compounds toward the analytical column. Automating this transfer connects preparation directly with chromatography, reducing manual handling and supporting a consistent analytical workflow.
The extraction column performs an initial cleanup, whereas the analytical column carries out the detailed chromatographic separation and supports detection. Dividing these functions allows complex specimens to be treated before they reach the analytical separation stage. This arrangement is particularly useful when measuring drugs, metabolites, or biomarkers in plasma or urine.
A typical workflow begins when a biological sample passes through the short extraction column. Target compounds interact with its stationary phase, while unwanted matrix components are washed away. The valve then changes the flow path so the retained compounds enter the analytical column for separation and detection. These linked stages integrate preparation with chromatographic analysis.
The approach is suited to complex biological specimens, including plasma and urine, when the analytical targets include drugs, metabolites, or other biomarkers. Its value comes from isolating these compounds before chromatographic analysis, helping separate relevant signals from sample-matrix components. Consequently, it can support quantitative bioanalysis in medical research and related analytical workflows.
Researchers may choose it when sample preparation must be integrated with chromatography and repeated handling should be minimized. The automated arrangement can improve workflow throughput and reproducibility while maintaining compatibility with quantitative bioanalysis. It is therefore relevant to studies that measure compounds across complex biological samples and require a consistent path from preparation to detection.