Polymer Stationary Phase
Polymer Stationary Phase - Related Videos
10:14
Synthesis and Purification of Iodoaziridines Involving Quantitative Selection of the Optimal Stationary Phase for Chromatography
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Cited by 3 •
2014
A protocol for the diastereoselective one-pot preparation of cis-N-Ts-iodoaziridines is described. The generation of diiodomethyllithium, addition to N-Ts aldimines and cyclization of the amino gem-diiodide intermediate to iodoaziridines is demonstrated. Also included is a protocol to rapidly and quantitatively assess the most appropriate stationary phase for purification by chromatography.
01:17
Gas Chromatography: Types of Columns and Stationary Phases
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2024
Gas chromatography (GC) relies on stationary phases to separate and analyze components in a sample. There are two main types of stationary phases: liquid and solid. Liquid stationary phases are non-volatile, thermally stable, and chemically inert liquids coated onto the column. Solid stationary phases are particles of adsorbent material, such as silica gel or molecular sieves. For an analyte to remain on the column for a sufficient amount of time, it must exhibit some level of compatibility (or...
13:42
Solid-phase Submonomer Synthesis of Peptoid Polymers and their Self-Assembly into Highly-Ordered Nanosheets
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Cited by 40 •
2011
A simple and general manual peptoid synthesis method involving basic equipment and commercially available reagents is outlined, enabling peptoids to be easily synthesized in most laboratories. The synthesis, purification and characterization of an amphiphilic peptoid 36mer is described, as well as its self-assembly into highly-ordered nanosheets.
02:34
Polymers
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2020
The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the properties that they exhibit. Additionally,...
09:42
Solid Phase Synthesis
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2023
Source: Vy M. Dong and Diane Le, Department of Chemistry, University of California, Irvine, CA Merrifield's solid-phase synthesis is a Nobel Prize winning invention where a reactant molecule is bound on a solid support and undergoes successive chemical reactions to form a desired compound. When the molecules are bound to a solid support, excess reagents and byproducts can be removed by washing away the impurities, while the target compound remains bound to the resin. Specifically, we will...
FAQs
Retention in a polymer stationary phase depends on the chemical relationship between the analyte, polymer, and mobile phase. Partitioning distributes molecules between phases, hydrophobic interactions favor nonpolar associations, ion exchange uses charge-based interactions, and size-dependent exclusion separates according to molecular size. Because these mechanisms differ, polymer materials can support distinct separation strategies for biochemical mixtures.
Cross-linked polymer chains provide an immobilized structure through which analytes encounter a defined stationary environment. Surface chemistry can be tuned to favor partitioning, hydrophobic interactions, ion exchange, or size-dependent exclusion. These properties also contribute to chemical stability and compatibility with varied solvents, allowing the phase to be selected for different analytes and chromatographic conditions.
The mobile phase controls how quickly components move through the column relative to their interactions with the polymer. Less strongly retained compounds advance with the mobile phase, whereas stronger retention delays movement. This difference in migration produces separated components rather than a single mixture, making the choice of polymer chemistry and mobile-phase compatibility important for biochemical analysis.
During a column separation, the mixture enters a column containing the polymer material, and the mobile phase carries the components through it. Each component experiences the available polymer interactions to a different extent, so migration rates diverge. The resulting separation allows individual components or groups of components to be examined rather than analyzed only as an unresolved mixture.
These phases can be applied to proteins, peptides, nucleic acids, metabolites, and other biomolecules. Their value differs with the task: purification uses selective retention to separate components, while characterization uses chromatographic behavior to help examine a sample. This breadth makes polymer-based materials relevant to both preparing biochemical substances and studying their composition with HPLC or related methods.
They are especially useful when an analysis requires chemical stability, tunable surface properties, or compatibility with varied solvents. Those characteristics let researchers match the stationary material to different retention mechanisms and biomolecular targets. Consequently, polymer phases can serve in high-performance liquid chromatography and related analytical methods where separation, purification, or characterization must be adapted to the sample.