Specialty In-Line Purifier for GC-MS HeliumThe most sensitive GC-MS instruments require a steady stream of ultra-high purity (99.99999%) helium for optimal performance. To achieve this level, a specialty purifier is required. These purifiers contain multiple adsorbent beds for the removal of all critical contaminants. Additionally, the adsorbent materials are packed into the cartridge under helium to ensure no other gas off-g…
Purification Consumables and Custom Products.We understand that your purification challenges are unique. That’s why we offer you a variety of options to help you solve them. Whether you seek the up-front cost savings and versatility of packing your own columns, the consistent quality and time savings of pre-packed columns, or the ease associated with having us purify material for you; Sigma-Aldrich is your purification partner…
HPLC and FPLC Columns for the Analysis and Purification of Biopolymers.Biopolymers, including peptides, proteins, polynucleotides, and other biodegradable polymers, display a variety of ionic charges and differ in terms of hydrophobicity, size, shape and mass. In addition to these structural (and functional) complexities, an individual biopolymer is typically present at low concentration in samples that contain many similar co…
Cyclodextrin-based DEX and Astec CHIRALDEX phases are stable, high boiling liquids and make effective CSPs for enantiomer separations by GC. The two lines exhibit complementary selectivity.Cyclodextrins are macromolecules composed of 6 or more D(+)-glucose residues bonded through α-glycosidic linkages. They are classified according to the number of glucose residues they contain: α-cyclodextrins (six residues), β-cyclodextrins…
Supelco′s new Low Adsorption (LA) vials are manufactured using a process that decreases the number of hydroxyl groups on the vial′s glass surface, significantly reducing surface activity while improving analytical quantitation and minimizing pH shifts in the sample.This same process also removes unwanted surface metals such as sodium and boron that can contaminate samples and interfere with trace analysis. Unlike other methods…
Our new certified vial, cap and septa products eliminate "fit" and septa contamination concerns associated with other brands.By taking these extra manufacturing and testing steps, we can ensure:• Caps thread properly onto vials, providing an air-tight seal• Syringe needles are not damaged by irregular vial bottom thickness• Minimal contamination from septa impurities.Quality is built into each component of the Supelco certifie…
The pentafluorophenylpropyl (PFP) stationary phase of Ascentis® Express F5 provides a stable, reversed-phase packing with electron-deficient phenyl rings due to the presence of electronegative fluorines. In addition to forming p-p and mildly steric interactions, F5 phases also retain compounds by polar interactions. As a result of having both polar and non-polar character, F5 phases can show dual-mode retention behavior, some…
This column allows highly reproducible analyses of fatty acid methyl esters (FAMEs), specifically the omega 3 and omega 6 fatty acids. It is tested to ensure reproducible FAME equivalent chain length (ECL) values and resolution of key components. Column Details: Phase: Bonded; poly(ethylene glycol) USP Code: G16 Length: 15, 30 m ID: 0.10, 0.25, 0.32, 0.53 mm df: 0.10, 0.25, 0.50
Ascentis Express HPLC columns, through the use of Fused-Core® particle technology, can provide you with both the high speed and high efficiencies of sub-2 μm particles while maintaining lower backpressures. The combination of high efficiency and low backpressure benefits UPLC® (or other ultra high pressure system) users, as well as conventional HPLC users. Column Details: Mode of chromatography: Hydrophilic interaction…
Application: The 35% phenyl equivalent phase provides a higher polarity option compared to columns containing a lower phenyl content, resulting in a greater retention of polar analytes relative to non-polar compounds. Its selectivity is complementary when paired with SLB-5ms for applications that require dual-column confirmatory analysis, such as for environmental analytes (such as pesticides, PCBs, and herbicides). The low…
