Purification Technique
Purification Technique - Related Videos
03:03
An Affinity Chromatography Technique for the Purification of Monoclonal Antibodies
0 Views •
2025
This video demonstrates a technique for purifying monoclonal antibodies from the culture supernatant obtained from an antibody-producing cell culture. The process involves using a matrix of crosslinked agarose beads with conjugated Protein A, which immobilizes the antibodies in the supernatant on the beads, allowing for effective separation from contaminants. By applying an elution buffer with low pH, the protein A-antibody interaction is loosened, facilitating the collection of...
02:54
An Affinity Chromatography Technique for the Purification of a Recombinant Bacterial Protein
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2025
Source: Becker, B., et al. A Simple Fluorescence-based Reporter Assay to Identify Cellular Components Required for Ricin Toxin A Chain (RTA) Trafficking in Yeast. J. Vis. Exp. (2017).This video demonstrates the purification of a polyhistidine-tagged recombinant protein using nickel-based affinity chromatography. It outlines key steps, including bacterial lysis by sonication, clarification and filtration of the lysate, and selective binding and elution of the target protein using imidazole.
08:16
Plasmid Purification
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2023
Plasmid purification is a technique used to isolate and purify plasmid DNA from genomic DNA, proteins, ribosomes, and the bacterial cell wall. A plasmid is a small, circular, double-stranded DNA that is used as a carrier of specific DNA molecules. When introduced into a host organism via transformation, a plasmid will be replicated, creating numerous copies of the DNA fragment under study. In this video, a step-by-step generalized procedure is described for how to perform plasmid purification.
06:30
Gel Purification
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2023
Gel purification is used to recover DNA fragments after electrophoretic separation. DNA recovery from an agarose gel includes three basic steps: binding, washing and eluting from a silica column. DNA is believed to bind to silica in the presence of high salt via a salt bridge. Following binding, DNA is washed of impurities and eluted under low salt conditions disrupting this interaction. This video goes through a step-by-step, generalized procedure for cutting out a band from the gel, gel...
12:28
Protein Purification Technique that Allows Detection of Sumoylation and Ubiquitination of Budding Yeast Kinetochore Proteins Ndc10 and Ndc80
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Cited by 11 •
2015
This manuscript describes the detection of sumoylation and ubiquitination of kinetochore proteins, Ndc10 and Ndc80, in the budding yeast Saccharomyces cerevisiae.
FAQs
The separation depends on a property that distinguishes the desired substance from its impurities. Solubility supports crystallization, boiling point supports distillation, particle size supports filtration, and polarity or affinity supports extraction and chromatography. A suitable choice increases the likelihood that the target substance is separated selectively rather than carried through with unwanted components.
These properties determine how substances respond to particular separation conditions. Solubility differences can enable one component to crystallize, while boiling-point differences allow components to be separated during distillation. Polarity and affinity guide extraction or chromatography, and particle-size differences make filtration useful. Matching the property to the method is central to effective purification.
A single method may not adequately separate a desired compound from a complex mixture when several impurities have similar behavior under one set of conditions. Combining approaches that rely on different properties can improve separation effectiveness. This strategy is especially relevant when material must be sufficiently pure for identification, analysis, further reactions, or structural and functional studies.
Method selection influences how cleanly the desired material is isolated, how much of it remains available after separation, and how consistently the result can be repeated. An effective approach balances removal of impurities with retention of the target substance. Improved purity, recovery, and reproducibility support more dependable analytical results and subsequent chemical work.
Selection begins with the property that most clearly differs between the target and its impurities. Crystallization addresses solubility, distillation addresses boiling point, filtration addresses particle size, and extraction or chromatography can use polarity or affinity. The mixture's composition and the intended use of the isolated material determine which approach, or combination of approaches, is most appropriate.
Chemists first consider the target substance and the differences between it and the impurities, then select a compatible separation method. After isolation, the material can be prepared for identification or analysis, or used in further reactions. If one separation does not provide sufficient quality, additional techniques can be combined to improve the outcome.
Purification removes unwanted substances that could interfere with identification, analysis, or later reactions. In synthetic chemistry, this supports work with isolated compounds, while pharmaceutical research depends on material suitable for reliable study. The overview also places purification within broader preparation workflows for compounds examined for structural and functional properties.
Material obtained after purification can be suitable for identification, analytical examination, and further reactions. Greater purity helps those activities focus on the intended substance rather than accompanying impurities. Purified compounds can also support structural and functional studies, making purification an important preparation stage across several chemistry research workflows.