Elution Time
Elution Time - Related Videos
01:05
High-Performance Liquid Chromatography: Elution Process
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2024
In High-Performance Liquid Chromatography (HPLC), the elution process is critical to the separation of analytes and the quality of chromatographic results. Elution describes how compounds move through the column and separate based on their interactions with the mobile and stationary phases. This process determines the resolution, peak shape, and retention times in the chromatogram, which are essential for identifying and quantifying components in complex mixtures. Understanding the elution...
06:18
A Novel Method to Determine the Longitudinal Antibacterial Activity of Drug-Eluting Materials
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Cited by 5 •
2023
Here, we present a protocol to evaluate the antibacterial efficacy of an antibiotic-eluting polymer to simulate prophylactic clinical application by using a commercially available real-time ATP-based luminescent microbial viability assay. This method enables the monitoring of the longitudinal activity of drug-eluting materials and can be widely adapted to test anti-microbial drug delivery platforms.
11:38
CN-GELFrEE - Clear Native Gel-eluted Liquid Fraction Entrapment Electrophoresis
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Cited by 11 •
2016
This protocol describes how to prepare and perform clear native gel-eluted liquid fraction entrapment electrophoresis (CN-GELFrEE), a native separation technique for non-covalent biomolecular assemblies and proteins from heterogeneous samples that is compatible with various downstream protein analysis techniques.
08:26
Design of a Biocompatible Drug-Eluting Tracheal Stent in Mice with Laryngotracheal Stenosis
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Cited by 13 •
2020
Laryngotracheal stenosis results from pathologic scar deposition that critically narrows the tracheal airway and lacks effective medical therapies. Using a PLLA-PCL (70% poly-L-lactide and 30% polycaprolactone) stent as a local drug delivery system, potential therapies aimed at decreasing scar proliferation in the trachea can be studied.
03:41
DFE-Based Affinity Chromatography: A Technique for Purification of 2F5 Monoclonal Antibodies from a Crude Sample Using High Ionic Strength-Based Elution Conditions
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2025
This video describes an affinity chromatography technique for purifying 2F5 monoclonal antibodies using the DsRed-2F5-Epitope or DFE ligands. The purified 2F5 monoclonal antibodies are essential drugs in immunotherapy.
FAQs
Relative affinity for the stationary and mobile phases is the main determinant. A compound that interacts more strongly with the stationary phase is retained longer, while stronger preference for the mobile phase promotes earlier passage through the system. Comparing these retention behaviors helps distinguish compounds that travel through the column at different rates.
Changes in solvent composition or flow rate can shift when a compound reaches the detector. Solvent composition alters the balance of interactions between the compound and the two phases, whereas flow rate changes the time available for movement through the system. Controlled conditions are therefore important when comparing results across chromatographic runs.
Temperature and column properties affect the conditions under which compounds move and interact during separation. A change in either factor can alter the measured elution time even when the sample itself remains unchanged. Monitoring these variables helps analysts decide whether a shifted result reflects sample behavior or a change in chromatographic performance.
Analysts compare the elution time of a sample component with that of a reference standard analyzed under comparable chromatographic conditions. Agreement supports the identification of that component, while a difference may indicate another compound or a changed separation condition. This comparison provides evidence for identification rather than relying on the sample signal alone.
In high-performance liquid chromatography and gas chromatography, analysts use the measured arrival time of separated components to support mixture analysis. The same principle applies across both techniques, although the chromatographic system and operating conditions differ. Elution-time comparisons can help determine whether expected components are present and whether a run produced a consistent separation.
A changed elution time can signal altered solvent composition, flow rate, temperature, or column properties. It may also indicate that column performance has changed. Analysts can compare the new measurement with reference standards or previous runs to separate possible sample differences from method or system changes, supporting more reliable interpretation of mixture composition.