Thin Layer Substrate
Thin Layer Substrate - Related Videos
09:09
Layer-by-layer Synthesis and Transfer of Freestanding Conjugated Microporous Polymer Nanomembranes
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Cited by 3 •
2015
In this paper we describe the interfacial synthesis of conjugated microporous polymers (CMP) on sacrificial substrates, and the dissolution of the substrate for the preparation of freestanding CMP nanomembranes. In addition, we will describe how the fragile nanomembranes can be transferred to other substrates.
03:07
Thin-Layer Chromatography - Concepts
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2020
Chromatography Chromatography is a technique used in organic chemistry to separate compounds in a mixture based on their differences in solubility between two different phases. The concept is similar to liquid-liquid extraction, except in chromatography, the two phases consist of the stationary phase and the mobile phase. The stationary phase is a solid — typically a microscale hydrogel bead — while the mobile phase is a carrier solvent. In traditional chromatography, the stationary phase is...
14:32
Thin-Layer Chromatography - Student Protocol
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2020
Source: Lara Al Hariri and Ahmed Basabrain at the University of Massachusetts Amherst, MA, USA Effects of Mobile Phase Composition on Compound SeparationExpand In this section of the lab, you will use TLC to compare how well pure hexane and a mixture of 60% hexane and 40% ethyl acetate can separate phenol, benzoic acid, and butyl phenyl ether by measuring the distance the compound traveled in each solvent. Before starting the lab, put on a lab coat, safety glasses, and nitrile gloves.
09:56
Layer-by-layer Collagen Deposition in Microfluidic Devices for Microtissue Stabilization
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Cited by 7 •
2015
The creation of functional microtissues within microfluidic devices requires the stabilization of cell phenotypes by adapting traditional cell culture techniques to the limited spatial dimensions in microdevices. Modification of collagen allows the layer-by-layer deposition of ultrathin collagen assemblies that can stabilize primary cells, such as hepatocytes, as microfluidic tissue models.
05:28
MALDI Sample Preparation: the Ultra Thin Layer Method
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Cited by 31 •
2007
This video demonstrates the preparation of an ultra-thin matrix/analyte layer for analyzing peptides and proteins by Matrix-Assisted Laser Desorption Ionization Mass Spectrometry (MALDI-MS).
FAQs
Compound movement reflects a balance between attraction to the adsorbent coating and ability to dissolve in the moving solvent. Stronger adsorption to materials such as silica gel or alumina can slow a compound, while greater solubility in the mobile phase can promote movement. Differences in these properties allow compounds in a biological sample to form separate positions.
The adsorbent coating acts as the stationary phase, providing surfaces that retain compounds to different degrees. The solvent serves as the mobile phase and advances through the porous layer by capillary action. Separation occurs because each compound repeatedly partitions between remaining attached to the coating and traveling with the solvent, producing distinct migration behavior.
Biological samples can contain several small molecules produced by related pathways, yet those molecules may differ in polarity, solubility, or affinity for the adsorbent. The substrate converts these chemical differences into separated positions on the plate. This makes it possible to compare sample patterns, even when the compounds originated from the same tissue, reaction, or extract.
A sample is placed on the coated plate, and a solvent is allowed to move through the porous layer. As the solvent travels, sample components migrate at different rates and become spatially separated. The resulting pattern can then be viewed for comparison among samples, helping researchers monitor biochemical reactions or evaluate whether a preparation contains multiple compounds.
The approach is useful for examining lipids, pigments, metabolites, and other small molecules. These compound groups often differ in polarity and solvent behavior, making them suitable for separation on an adsorbent layer. In biology, the resulting patterns can support sample comparisons and provide a rapid way to inspect chemical composition without relying only on the original mixture.
A sample pattern provides evidence about whether components remain together or appear at different positions after solvent development. Comparing patterns from related samples can reveal changes associated with a biochemical reaction, while a simpler pattern may support an assessment of compound purity. The method is especially valuable when rapid visual comparison is more important than exhaustive chemical characterization.