Pcr Purification
Pcr Purification - Related Videos
06:30
Gel Purification
0 Views •
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...
08:51
Genotyping of Staphylococcus aureus by Ribosomal Spacer PCR (RS-PCR)
0 Views •
Cited by 9 •
2016
Here, ribosomal spacer PCR (RS-PCR) is used together with a miniaturized electrophoresis system as a fast and high resolution method for genotyping S. aureus at moderate costs allowing a high throughput.
08:16
Plasmid Purification
0 Views •
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.
14:07
Genome-wide Gene Deletions in Streptococcus sanguinis by High Throughput PCR
0 Views •
Cited by 9 •
2012
An efficient genome-wide single gene mutation method has been established using Streptococcus sanguinis as a model organism. This method has achieved via high throughput recombinant PCRs and transformations.
03:41
Agarose Gel Electrophoresis of DNA Amplicons Post PCR: A Method to Analyze Products of Multiplex PCR and Evaluate PCR Reaction Success
0 Views •
2025
In this video, we demonstrate the separation of bacterial PCR-amplified DNA using agarose gel electrophoresis. Agarose gel functions as a molecular sieve, enabling the negatively-charged DNA to migrate based upon their size under an applied electric field.
FAQs
High-salt conditions promote selective DNA binding to a silica membrane or magnetic bead, allowing the amplified product to remain associated with the purification medium during washing. A later low-salt buffer or water weakens that interaction and releases the DNA. This change in chemical conditions creates the central separation step before downstream analysis.
Residual primers, unused nucleotides, enzymes, salts, and other reaction components can interfere with reactions performed on amplified DNA. Removing these materials improves the chemical cleanliness of the template rather than simply increasing its amount. That distinction matters because downstream reliability depends on both DNA quality and concentration, particularly in sequencing, cloning, and genotyping workflows.
Silica membranes and magnetic beads provide two formats for selectively capturing DNA from a PCR mixture. In both cases, high-salt conditions support DNA binding, washing removes unwanted reaction components, and low-salt buffer or water supports elution. Their shared binding and release principle enables the amplified product to be separated from the rest of the reaction.
The workflow begins with an amplified DNA sample and conditions that promote binding to a silica membrane or magnetic bead. The captured material is then washed to remove residual primers, nucleotides, enzymes, salts, and other components. Finally, purified DNA is eluted into a low-salt buffer or water for use in another molecular biology procedure.
Researchers use PCR purification when an amplified DNA product will serve as a template for sequencing, cloning, genotyping, or another downstream molecular biology application. Cleanup is valuable because it removes reaction components that could interfere with the next procedure. The resulting product provides a cleaner and more reliable starting material for analyzing amplified genetic material.
PCR purification improves the quality and concentration of the recovered amplified DNA by removing residual components from the amplification reaction and transferring the product into a low-salt buffer or water. These improvements help reduce interference in subsequent reactions. As a result, researchers can obtain more reliable downstream analysis of the amplified genetic material.