Purification Preparation
Purification Preparation - Related Videos
10:43
Preparation, Purification, and Use of Fatty Acid-containing Liposomes
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Cited by 17 •
2018
Liposomes containing single-chain amphiphiles, particularly fatty acids, exhibit distinct properties compared to those containing diacylphospholipids due to the unique chemical properties of single chain amphiphiles. Here we describe techniques for the preparation, purification, and use of liposomes comprised in part or whole of these amphiphiles.
00:07
Purification of High Yield Extracellular Vesicle Preparations Away from Virus
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Cited by 13 •
2019
This protocol isolates extracellular vesicles (EVs) away from virions with high efficiency and yield by incorporating EV precipitation, density gradient ultracentrifugation, and particle capture to allow for a streamlined workflow and a reduction of starting volume requirements, resulting in reproducible preparations for use in all EV research.
13:21
Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging
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Cited by 9 •
2011
We demonstrate the metalation, purification, and characterization of lanthanide complexes. The complexes described here can be conjugated to macromolecules to enable tracking of these molecules using magnetic resonance imaging.
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...
FAQs
A suitable buffer helps preserve the target biological material during disruption and handling while limiting degradation. It also keeps the sample in a condition compatible with later purification steps. If the buffer does not adequately protect the material, losses or contamination can reduce the quality and reproducibility of results obtained through chromatography, electrophoresis, or related analyses.
Tissue disruption or cell lysis makes the target material accessible for subsequent isolation, while homogenization helps produce a more uniform sample. The extent and consistency of these steps influence how effectively the target can be separated from unwanted material. Incomplete preparation may leave target material unavailable, reducing recovery and making downstream purification less consistent.
Clarification removes debris and other unwanted material before the target undergoes a selective purification step. Centrifugation and filtration provide alternative ways to condition the sample, allowing the preparation workflow to accommodate different biological materials and procedures. Effective clarification improves sample cleanliness and can help chromatography or electrophoresis produce more interpretable results.
A consistent workflow begins with careful sample collection, followed by disruption or lysis, homogenization, and clarification. Using an appropriate buffer throughout helps protect the target and limit degradation. Completing these conditioning stages before chromatography, electrophoresis, or another isolation method reduces interfering material and supports more reproducible downstream processing.
The approach can condition samples containing proteins, nucleic acids, organelles, cell components, or microorganisms. The specific target determines what material must be preserved and what unwanted material should be removed before isolation. This broad applicability makes preparation relevant across biological experiments that require cleaner samples for analysis or further purification.
Preparation quality affects both the cleanliness of the sample and the reproducibility of later results. Removing debris and contaminants before a selective method can improve the efficiency of chromatography or electrophoresis and make target-related findings easier to interpret. In biology, this conditioning step therefore links initial sample handling with reliable analysis of biomaterials.