Silica Gel Tlc
Silica Gel Tlc - Related Videos
01:10
Silica Gel Column Chromatography: Overview
0 Views •
2024
Silica gel column chromatography is a technique for separating compounds using a column packed with silica gel as the stationary phase. This method relies on differences in the polarity of compounds. Based on their polarities, compounds move between the stationary phase (silica gel) and the mobile phase (the solvent), forming discrete bands in the column. Polar components tend to bind strongly to the silica gel, causing them to move slowly through the column. In contrast, nonpolar compounds...
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.
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.
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...
09:11
Porosimetry of a Silica Alumina Powder
0 Views •
2023
Source: Kerry M. Dooley and Michael G. Benton, Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA Surface area and pore size distribution are attributes used by adsorbent and catalyst manufacturers and users to ensure quality control and to determine when products are at the end of their useful lives. The surface area of a porous solid is directly related to its adsorption capacity or catalytic activity. The pore size distribution of an adsorbent or catalyst is...
FAQs
Migration reflects a balance between attraction to the polar silica surface and solubility in the rising solvent. A compound that interacts strongly with silica tends to remain closer to its starting position, whereas one that is more compatible with the mobile phase travels farther. These differences produce separate spots that can be compared across samples.
The compounds do not have identical affinities for the stationary and mobile phases. Even within one extract, some molecules remain relatively associated with silica while others move more readily with the solvent. Their unequal migration distances resolve the mixture into distinct spots, allowing researchers to compare composition without isolating every component first.
Retention factor, or Rf, provides a migration-based measurement for each spot. Comparing Rf values and spot patterns between an unknown sample and other samples can support compound identification or reveal differences in composition. Because the measurement reflects movement under the selected separation conditions, it is especially useful for consistent comparisons and reaction monitoring.
A researcher places the sample on a silica-coated plate, exposes the plate to a suitable solvent, and allows the solvent to rise by capillary action. Compounds separate as they migrate different distances, producing spots. The resulting pattern can then be examined and the migration of spots measured using retention factors for comparison.
A sample’s separated spots provide a visual comparison of its components. Comparing the pattern before and after a biochemical reaction can show whether the mixture has changed, while comparison with a reference sample can support compound identification. The same information can also help assess whether a sample appears to contain one component or several detectable components.
In biology, silica gel TLC can be applied to lipids, pigments, metabolites, and other small molecules. The technique helps compare these components, assess sample purity, identify compounds, and monitor biochemical reactions. Its rapid operation and low sample requirement also make it suitable for laboratory research and instructional settings.