Tlc Purification
Tlc Purification - Related Videos
12:04
Thin-layer Chromatographic (TLC) Separations and Bioassays of Plant Extracts to Identify Antimicrobial Compounds
0 Views •
Cited by 52 •
2014
Methods are described for thin-layer chromatographic (TLC) separation of plant extracts and contact bioautography to identify antibacterial metabolites. The methods are applied to the screening of red clover phenolic compounds inhibiting hyper ammonia-producing bacteria (HAB) native to the bovine rumen.
01:11
Thin-Layer Chromatography (TLC): Overview
0 Views •
2025
Thin-layer chromatography (TLC) is a chromatography technique that separates compounds based on their polarity. TLC typically uses polar silica gel, a form of silicon dioxide, as the stationary phase. The silica gel contains hydroxyl (OH) groups on its surface, which form hydrogen bonds with polar compounds, influencing their adhesion to the stationary phase. To begin the analysis, a mixture of compounds is spotted on the starting line on the TLC plate using a thin capillary. The bottom of the...
13:02
Arabidopsis thaliana Polar Glycerolipid Profiling by Thin Layer Chromatography (TLC) Coupled with Gas-Liquid Chromatography (GLC)
0 Views •
Cited by 102 •
2011
Composition of polar lipid extracts and the fatty acid composition of individual glycerolipids are determined in a simple and robust lipid profiling experiment. For this purpose, glycerolipids are isolated by thin layer chromatography and subjected to transmethylation of their acyl groups. Fatty acyl methylesters are quantified by gas-liquid chromatography.
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.
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...
FAQs
Each compound balances two interactions as the mobile phase moves: adsorption to the silica stationary phase and solubility in the mobile phase. A compound that remains more strongly associated with silica advances more slowly, whereas one more soluble in the moving solvent travels farther. These differences produce spatially separated bands that can be recovered individually.
The mobile phase determines how readily compounds move through the silica layer. Because compounds differ in solubility in that solvent and in their adsorption to silica, changing the moving solvent can alter their travel rates and separation. Selecting conditions that create distinct bands is therefore important for both identifying and recovering a desired product.
Applying the sample as a band creates a defined region from which separated material can later be recovered. As the solvent passes through the plate, compounds migrate away from that starting region at different rates. After development, the resulting separated bands provide physical targets for removing silica and collecting individual components.
After development, separated bands are located using ultraviolet light or a stain. These visualization methods reveal where compounds are positioned on the silica-coated plate without relying only on visible color. Once a relevant band is identified, its silica can be removed for elution, connecting separation and product recovery.
The basic setup requires a silica-coated plate, a sample mixture, and a mobile-phase solvent that can move through the stationary layer by capillary action. Ultraviolet light or a stain is used after development to locate bands. Recovery additionally requires removing the silica containing the selected band and eluting the compound from it.
First, locate the separated bands under ultraviolet light or with a stain. Next, identify the band associated with the material of interest, remove the corresponding silica from the plate, and elute the compound from that silica. This sequence converts a spatial separation on the plate into an isolated chemical sample.
This approach is useful during reaction workups, when a chemist needs to check or recover material after a synthesis. It also supports product cleanup and rapid isolation when only milligram quantities are available. Its small scale makes it appropriate when recovering a limited amount of product is more practical than using a larger separation.
TLC purification can provide both evidence of separated components and a recovered product fraction. Distinct bands show that compounds have migrated differently through the silica, while removing and eluting a selected band yields material for further use. This makes the method relevant not only to cleanup, but also to checking and recovering synthetic products.