Probe Purification
Probe Purification - Related Videos
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...
11:22
GST-His purification: A Two-step Affinity Purification Protocol Yielding Full-length Purified Proteins
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Cited by 18 •
2013
In the present protocol, we demonstrate a highly efficient and cost-effective small-scale protein purification method, which allows purification of recombinant proteins by uniquely combining a cleavable GST-tag and a small His-tag.
11:09
Chromatin Isolation by RNA Purification (ChIRP)
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Cited by 380 •
2012
ChIRP is a novel and rapid technique to map genomic binding sites of long noncoding RNAs (lncRNAs). The method takes advantage of the specificity of anti-sense tiling oligonucleotides to allow the enumeration of lncRNA-bound genomic sites.
07:32
Purification of Mouse Brain Vessels
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Cited by 90 •
2015
We describe a protocol allowing the purification of the mouse brain's vascular compartment. Isolated brain vessels include endothelial cells linked by tight junctions and surrounded by a continuous basal lamina, pericytes, vascular smooth muscle cells, as well as perivascular astroglial membranes.
FAQs
The separation method must match a useful difference between the probe and unwanted material. Molecular size can support filtration or dialysis, while charge, polarity, or binding affinity can guide chromatography or selective precipitation. A strong difference improves removal of unreacted components and byproducts, helping preserve the probe’s identity, concentration, and suitability for later experiments.
Each method exploits a different property, so no single approach is universally optimal. Chromatography can separate materials through charge, polarity, or binding affinity, whereas filtration and dialysis emphasize molecular size, and selective precipitation relies on differences that allow one component to be separated from another. The selected method therefore influences contaminant removal and the reliability of the purified preparation.
Residual solvents, unreacted materials, and byproducts can increase background, introduce toxicity, or interfere with how a probe performs in an assay. Removing them supports more specific detection of neural cells, signaling molecules, or circuit activity. Purity therefore affects not only chemical quality, but also the interpretability and reproducibility of imaging, biochemical measurements, and functional studies.
Begin by considering the probe’s relevant property differences from the contaminants, including size, charge, polarity, or binding affinity. The workflow should then target unreacted materials, byproducts, solvents, and other unwanted components without compromising the probe’s identity or concentration. Confirming those characteristics after separation is important because downstream performance depends on a reliable preparation.
The probe category alone does not determine the method; researchers should match the separation principle to the properties of the specific preparation and its contaminants. Size-based approaches may be appropriate when molecular dimensions differ, while chromatography, dialysis, or selective precipitation may be selected when charge, polarity, or binding behavior offers better discrimination. This choice supports consistent use in neural experiments.
Purified probes can improve signal specificity and reduce background or toxicity when used to examine neural cells, signaling molecules, or circuit activity. These benefits support fluorescent imaging, biochemical assays, and functional studies. More reliable identity and concentration also make results easier to reproduce across experiments, strengthening conclusions about molecular signals and nervous-system activity.