Detergent Removal
Detergent Removal - Related Videos
04:16
Enrichment of Bacterial Lipoproteins Using Non-Ionic Detergent Phase Separation
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2025
Source: Armbruster, K. M., Meredith, T. C. Enrichment of Bacterial Lipoproteins and Preparation of N-terminal Lipopeptides for Structural Determination by Mass Spectrometry. J. Vis. Exp. (2018)This video demonstrates the enrichment of bacterial lipoproteins using a non-ionic detergent that undergoes phase separation upon warming. Through sequential temperature shifts and centrifugation steps, lipoproteins are selectively partitioned into the detergent phase, while non-lipoprotein contaminants...
01:18
Detergent Purification of Membrane Proteins
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2023
Detergents are used to purify the integral proteins of the membrane. The hydrophobic portion of the detergent can replace membrane phospholipids while solubilizing the membrane proteins. When detergent monomers reach a specific concentration in a solution called critical micelle concentration (CMC), they form micelles. Above CMC, the concentration of the detergent monomers remains in equilibrium with the micelle. The number of detergent monomers present in the CMC varies for each detergent, and...
05:36
Isolation of Detergent-Insoluble Protein Aggregates From Human Postmortem Brain Tissue
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2025
This video explains the process of isolating and enriching detergent-insoluble protein aggregates from frozen postmortem human brain tissue. It demonstrates key steps, including homogenization, detergent treatment, sonication, and ultracentrifugation to separate and purify the insoluble aggregates. The final step involves solubilizing the aggregates in urea buffer for further analysis.
09:35
Enrichment of Detergent-insoluble Protein Aggregates from Human Postmortem Brain
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Cited by 45 •
2017
An abbreviated fractionation protocol for the enrichment of detergent-insoluble protein aggregates from human postmortem brain is described.
10:43
Expression, Detergent Solubilization, and Purification of a Membrane Transporter, the MexB Multidrug Resistance Protein
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Cited by 5 •
2010
In this protocol we demonstrate the expression, solubilization, and purification of a recombinantly expressed membrane protein, MexB, as a soluble protein detergent complex. MexB is a multidrug resistance membrane transporter from the opportunistic bacterial pathogen Pseudomonas aeruginosa.
FAQs
The key variable is how readily the surfactant leaves the sample while the biological material remains stable. Dialysis and dilution lower detergent concentration through exchange or added solvent, whereas hydrophobic resins and chromatography physically capture or separate detergent molecules. These mechanisms determine how removal proceeds and whether proteins or lipid complexes experience a disruptive concentration change.
A gradual decrease gives solubilized proteins and lipid complexes time to adjust as their surrounding chemical environment changes. If detergent concentration falls abruptly, the material may aggregate, precipitate, or lose biological activity. The removal rate therefore acts as a stability variable, influencing whether the recovered sample remains suitable for subsequent biochemical, structural, or reconstitution work.
These approaches are not interchangeable. The appropriate choice depends on detergent properties, including how the surfactant can be transferred or captured, and on the sample’s tolerance for changing conditions. A preparation with limited stability requires especially careful control of removal, while the selected method should also provide sufficient detergent reduction for the intended downstream analysis.
First identify the detergent and consider the stability of the protein, membrane, or lipid complex. Then select dialysis, dilution, hydrophobic-resin adsorption, or chromatography, and reduce the detergent while watching for aggregation, precipitation, or loss of activity. The method and extent of removal should match the requirements of the next experiment rather than applying the same treatment to every sample.
Membrane proteins may depend on detergent to remain handled in a solubilized state, but reconstitution requires a controlled transition away from that environment. Removing the surfactant carefully helps the preparation return toward a membrane-associated state without an abrupt destabilizing change. This improves the likelihood that the resulting sample will be useful for examining membrane-protein behavior.
Residual surfactant can interfere with downstream assays, making detergent reduction important for reliable biochemical measurements. Removal also helps prepare samples for structural analysis by reducing components that could disrupt the intended sample state. In biological studies, controlling both the extent and rate of removal helps ensure that observed properties reflect the protein or lipid complex rather than an avoidable detergent effect.